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  • Aerodynamics
  • Aircraft Stability and Control
  • Industrial Chemistry
  • 2020-2024  (12)
  • 1980-1984  (23)
  • 1950-1954  (1,415)
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Years
Year
  • 1
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    MDPI - Multidisciplinary Digital Publishing Institute
    Publication Date: 2023-11-30
    Description: Active flow control (AFC) utilizes local active perturbations to induce changes in global flow behavior that result in aero/hydrodynamic performance improvement. It has been a vibrant research area with potential applications in a wide range of engineering fields. This Special Issue is a collection of 11 excellent research papers published in Actuators, showcasing and discussing new advances in both fundamental and applied AFC technologies.
    Keywords: Active flow control ; Actuators ; Aerodynamics ; Synthetic jets&nbsp ; bic Book Industry Communication::T Technology, engineering, agriculture::TB Technology: general issues
    Language: English
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  • 2
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    IntechOpen | IntechOpen
    Publication Date: 2024-04-11
    Description: Some sixty years after the experimental flights of the North American X-15 hypersonic rocket-powered aircraft, sustained hypervelocity travel is still the next frontier in high-speed transportation. Today, there is much excitement and interest regarding hypersonic vehicles. In fact, many aerospace agencies, large industries, and several start-ups are involved in design activities and experimental campaigns both in wind tunnels and in-flight with full-scale experimental flying test beds and prototypes to make hypersonic travel almost as easy and convenient as airliner travel. Achieving this goal will radically revolutionize the future of civil transportation. This book contains valuable contributions that focus on various design issues related to hypersonic aircraft.
    Keywords: Aerodynamics ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials::TGM Materials science::TGMF Engineering: Mechanics of fluids::TGMF1 Aerodynamics
    Language: English
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  • 3
    Publication Date: 2023-12-20
    Description: Giulia Parola’s Environmental Democracy at the Global Level: Rights and Duties for a New Citizenship can be seen as a manifesto that is both traditional and revolutionary at the same time. It calls for the construction of a new civilisation centred on the environment, while drawing on the traditional notions of democratic government. It adopts an approach that is focused on the power of individuals rather than governments, as ways to protect and improve the environment. It proposes that environmental rights and ecological duties are self-evident and inalienable, and should be treated as the cornerstones of a new democracy. Parola’s book is a thought provoking and intriguing work that will be of interest to scholars of environmental studies as well as to legal practitioners and non-specialists. Giulia Parola has studied Environmental Law at the University of Torino, at the University of René Descartes in Paris, (where she obtained PhD in Public Law) and at the University of Iceland ( LLM in Natural Resources Law and International Environmental Law). In 2011, she was appointed by the University of Laval (Canada, Quebec) as a researcher and a lecturer in Environmental Law.
    Keywords: GE1-350 ; K ; International Law ; Materials Science ; Industrial Chemistry ; Law ; Comparative Law ; Foreign Law ; Environment ; Natural Sciences ; German Civil Code ; Pollution Control ; bic Book Industry Communication::K Economics, finance, business & management::KC Economics::KCN Environmental economics
    Language: English
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  • 4
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    IntechOpen | IntechOpen
    Publication Date: 2024-04-11
    Description: Aerodynamics, the study of air motion around solid objects, allows us to understand and measure the dominating forces acting on aircrafts, buildings, bridges, automobiles, and other structures. The forces that result in an aircraft overcoming gravity and drag are called thrust and lift. Various parameters such as geometrical configurations of objects, as well as physical properties of air, which may be functions of position and time, affect those forces. This book covers some of the latest studies regarding the application of the principles of aerodynamics to the design of many different engineered objects. This book will be of interest to mechanical and aerospace engineering students, academics, and researchers who are looking for new insights into this fascinating branch of fluid mechanics.
    Keywords: Aerodynamics ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials::TGM Materials science
    Language: English
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  • 5
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    Taylor & Francis | CRC Press
    Publication Date: 2024-03-31
    Description: Because of many misconceptions, the biological drug manufacturing industry does not fully utilize disposable components, despite their wide availability. These misconceptions include concerns for the quality of materials, running costs, scalability, the level of automation possible, and the training of staff needed to include these components in existing bioprocessing systems. Not fully realizing the long-term benefits, many manufacturers are unwilling to discard investments made in fixed equipment and traditional stainless steel systems. Regulatory and environmental concerns, however, will eventually compel manufacturers to adopt disposable systems. Making a strong case for disposables, Disposable Bioprocessing Systems demonstrates the true potential of these systems. Written by a researcher and professor with hands-on experience in designing, establishing, and validating biological manufacturing facilities worldwide, and creating model facilities using maximum disposable technology, this book is the first comprehensive introduction to understanding disposable systems. It gives an overview of the current state of the disposable bioprocessing industry, resolves all controversial issues, and guides readers in choosing disposable components that meet their needs. An important chapter on safety addresses facts and myths about the use of plastics and elastomers—including the issue of leaching—and how to ensure regulatory compliance. Helping readers understand their choices, the book describes the equipment and systems available to prepare the starting materials for the manufacturing of biological drugs—from disposable containers to filters. The author also discusses costs, regulations, and concerns about waste disposal, and shares his predictions for the future of the disposable bioprocessing industry. A practical manual for those interested in the transition to disposable systems, this book will also interest students of bioprocessing. It offers a timely view of disposable bioprocessing technology as a "game changer" that will facilitate developing new drugs and conducting research in the emerging field of stem cells and gene therapy.
    Keywords: Biotechnology ; Pharmaceutical Science ; Industrial Chemistry ; PHARMACEUTICAL ; BIOSCIENCE ; CHEMLIB ; SCI-TECH ; BIOMEDICALSCIENCE ; CHEMICALENGINEERING ; STM ; bags ; bioreactors ; cleaning ; disposal ; downstream ; single ; stainless ; steel ; use ; validation ; thema EDItEUR::M Medicine and Nursing::MF Pre-clinical medicine: basic sciences ; thema EDItEUR::M Medicine and Nursing::MK Medical specialties, branches of medicine::MKG Pharmacology ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TD Industrial chemistry and manufacturing technologies::TDC Industrial chemistry and chemical engineering ; thema EDItEUR::M Medicine and Nursing::MQ Nursing and ancillary services::MQW Biomedical engineering
    Language: English
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  • 6
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    IntechOpen | IntechOpen
    Publication Date: 2024-04-11
    Description: Aerodynamics, from a modern point of view, is a branch of physics that study physical laws and their applications, regarding the displacement of a body into a fluid, such concept could be applied to any body moving in a fluid at rest or any fluid moving around a body at rest. This Book covers a small part of the numerous cases of stationary and non stationary aerodynamics; wave generation and propagation; wind energy; flow control techniques and, also, sports aerodynamics. It's not an undergraduate text but is thought to be useful for those teachers and/or researchers which work in the several branches of applied aerodynamics and/or applied fluid dynamics, from experiments procedures to computational methods.
    Keywords: Aerodynamics ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials::TGM Materials science
    Language: English
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  • 7
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    IntechOpen | IntechOpen
    Publication Date: 2024-04-11
    Description: This book is intended to be a valuable addition to students, engineers, scientists, industrialists, consultants and others providing greater insight into wind tunnel designs and their enormous research potential. It is a compilation of works from world experts on subsonic and supersonic wind tunnel designs, applicable to a diverse range of disciplines. The book is organised in two sections. The first section comprises of three chapters on various aspects of stationary and portable subsonic wind tunnel designs, followed by one chapter on supersonic wind tunnel and the final chapter discusses a method to address unsteadiness effects of fan blade rotation. The second section contains four chapters regarding wind tunnel applications across a multitude of engineering fields including civil, mechanical, chemical and environmental engineering.
    Keywords: Aerodynamics ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials::TGM Materials science
    Language: English
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  • 8
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    IntechOpen | IntechOpen
    Publication Date: 2024-04-11
    Description: This book reports the latest development and trends in the low Re number aerodynamics, transition from laminar to turbulence, unsteady low Reynolds number flows, experimental studies, numerical transition modelling, control of low Re number flows, and MAV wing aerodynamics. The contributors to each chapter are fluid mechanics and aerodynamics scientists and engineers with strong expertise in their respective fields. As a whole, the studies presented here reveal important new directions toward the realization of applications of MAV and wind turbine blades.
    Keywords: Aerodynamics ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials::TGM Materials science
    Language: English
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  • 9
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    IntechOpen
    Publication Date: 2024-04-04
    Description: Spacecraft attitude maneuvers comply with Euler's moment equations, a set of three nonlinear, coupled differential equations. Nonlinearities complicate the mathematical treatment of the seemingly simple action of rotating, and these complications lead to a robust lineage of research. This book is meant for basic scientifically inclined readers, and commences with a chapter on the basics of spaceflight and leverages this remediation to reveal very advanced topics to new spaceflight enthusiasts. The topics learned from reading this text will prepare students and faculties to investigate interesting spaceflight problems in an era where cube satellites have made such investigations attainable by even small universities. It is the fondest hope of the editor and authors that readers enjoy this book.
    Keywords: Science ; Mechanics ; Aerodynamics ; bic Book Industry Communication::P Mathematics & science::PH Physics::PHD Classical mechanics::PHDF Fluid mechanics ; thema EDItEUR::P Mathematics and Science::PH Physics::PHD Classical mechanics::PHDF Physics: Fluid mechanics
    Language: English
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  • 10
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    Taylor & Francis | CRC Press
    Publication Date: 2024-04-11
    Description: Suitable for practicing engineers and engineers in training, this book covers the most important operations involving particulate solids. Through clear explanations of theoretical principles and practical laboratory exercises, the text provides an understanding of the behavior of powders and pulverized systems. It also helps readers develop skills for operating, optimizing, and innovating particle processing technologies and machinery in order to carry out industrial operations. The author explores common bulk solids processing operations, including milling, agglomeration, fluidization, mixing, and solid-fluid separation.
    Keywords: Industrial Chemistry ; Food Chemistry ; FOOD ; CHEMLIB ; SCI-TECH ; CHEMICALENGINEERING ; CHEMISTRY ; STM ; bed ; distribution ; fluidized ; industry ; mass ; material ; particle-size ; processing ; technology ; transfer ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TD Industrial chemistry and manufacturing technologies::TDC Industrial chemistry and chemical engineering ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TD Industrial chemistry and manufacturing technologies::TDC Industrial chemistry and chemical engineering::TDCT Food and beverage technology ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials::TGM Materials science
    Language: English
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  • 11
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    IntechOpen | IntechOpen
    Publication Date: 2024-04-11
    Description: Although great advances in computational methods have been made in recent years, wind tunnel tests remain essential for obtaining the full range of data required to guide detailed design decisions for various practical engineering problems. This book collects original and innovative research studies on recent applications in wind tunnel tests, exhibiting various investigation directions and providing a bird’s eye view on this broad subject area. It is composed of seven chapters that have been grouped in two major parts. The first part of the book (chapters 1–4) deals with wind tunnel technologies and devices. The second part (chapters 5–7) deals with the latest applications of wind tunnel testing. The text is addressed not only to researchers but also to professional engineers, engineering lecturers, and students seeking to gain better understanding of the current status of wind tunnels. Through its seven chapters, the reader will have an access to a wide range of works related to wind tunnel testing.
    Keywords: Aerodynamics ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials::TGM Materials science
    Language: English
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  • 12
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    IntechOpen | IntechOpen
    Publication Date: 2024-04-11
    Description: Spacecraft attitude maneuvers comply with Euler's moment equations, a set of three nonlinear, coupled differential equations. Nonlinearities complicate the mathematical treatment of the seemingly simple action of rotating, and these complications lead to a robust lineage of research. This book is meant for basic scientifically inclined readers, and commences with a chapter on the basics of spaceflight and leverages this remediation to reveal very advanced topics to new spaceflight enthusiasts. The topics learned from reading this text will prepare students and faculties to investigate interesting spaceflight problems in an era where cube satellites have made such investigations attainable by even small universities. It is the fondest hope of the editor and authors that readers enjoy this book.
    Keywords: Aerodynamics ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials::TGM Materials science
    Language: English
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  • 13
    Publication Date: 2004-12-03
    Description: Progress in aerodynamics over the past 50 years has been evidenced by the development of increasingly sophisticated and efficient flight vehicles throughout the flight spectrum. Advances have generally arisen in an evolutionary manner from experience gained in wind tunnel testing, flight testing, and improvements in analytical and computational capabilities. As a result of this evolutionary development, both military and commercial vehicles operate at a relatively high efficiency level. This observation plus the fact that airplanes have not changed appreciably in outward appearance over recent years has led some skeptics to conclude incorrectly that aerodynamics is a mature technology, with little to be gained from further developments in the field. It is of interest to note that progress in aerodynamics has occurred without a thorough understanding of the fundamental physics of flow, turbulence, vortex dynamics, and separated flow, for example. The present understanding of transition, turbulence, and boundary layer separation is actually very limited. However, these fundamental flow phenomena provide the key to reducing the viscous drag of aircraft. Drag reduction provides the greatest potential for increased flight efficiency from the standpoint of both saving energy and maximizing performance. Recent advances have led to innovative concepts for reducing turbulent friction drag by modifying the turbulent structure within the boundary layer. Further advances in this basic area should lead to methods for reducing skin friction drag significantly. The current challenges for military aircraft open entirely new fields of investigation for the aerodynamicist. The ability through very high speed information processing technology to totally integrate the flight and propulsion controls can permit an aircraft to fly with "complete abandon," avoiding departure, buffet, and other undesirable characteristics. To utilize these new control concepts, complex aerodynamic phenomena will have to be understood, predicted, and controlled. Current requirements for military aircraft include configuration optimization through a widened envelope from subsonic to supersonic and from low to high angles of attack. This task is further complicated by requirements for control of observables. These challenging new designs do not have the luxury of a large experimental data base from which to optimize for various parameter combinations. Consequently, there exists a strong need for better techniques, both experimental and computational, to permit design optimization in a complete sense.
    Keywords: Aerodynamics
    Type: Aeronautics Technology Possibilities for 2000: Report of a Workshop; 15-46; NASA-CR-205283
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  • 14
    Publication Date: 2019-07-13
    Description: The object of this investigation was to find and demonstrate a means of performing efficient finite-difference computations of rotor loading for a trimmed rotor in high-speed, forward flight. The essence of the scheme that was developed is a loose-coupled iteration procedure between a finite difference and a comprehensive integral rotor code. The coupling involves a transfer of appropriate load and inflow data on the advancing side between the two codes such that consistency maintained. Sample computations, including a limited comparison with model rotor data, are presented. The scheme converges rapidly. However, even one iteration with this scheme can provide sufficient accuracy for many purposes.
    Keywords: Aerodynamics
    Type: May 01, 1984; Arlington, VA; United States
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  • 15
    Publication Date: 2019-07-13
    Description: A transformation from the altitude and velocity state variables of three-dimensional flight mechanics to a new set of more desirable variables is found. The new variables provide a greater time-scale separation, decrease system coupling, and give better estimates of the fast-variable values along the reduced solution. One of the new variables is the often-used specific energy, whereas the other variable changes along a given trajectory, depending on the nature of the local reduced solution. Numerical examples are included.
    Keywords: Aerodynamics
    Type: American Control Conference; Jun 06, 1984 - Jun 08, 1984; United States
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  • 16
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    In:  CASI
    Publication Date: 2018-06-09
    Description: Drones, subscale vehicles like the Firebees, and full scale retired military aircraft are used to test air defense missile systems. The DFCS (Drone Formation Control System) computer, developed by IBM (International Business Machines) Federal Systems Division, can track ten drones at once. A program called ORACLS is used to generate software to track and control Drones. It was originally developed by Langley and supplied by COSMIC (Computer Software Management and Information Center). The program saved the company both time and money.
    Keywords: Aircraft Stability and Control
    Type: Spinoff 1983; 112
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  • 17
    Publication Date: 2019-06-28
    Description: The development of computational algorithms that permit efficient calculation of aircraft trim states and of the associated small disturbance equations of motion for a systematic investigation of the statics and dynamics of aircraft in coordinated and uncoordinated, steady, steep turning flight is reported. The efficiency in the trim computation is realized by decoupling the governing equations. The small disturbance equations of motion, which are given in a general body axis system, include aerodynamic acceleration derivatives; they are cast in a familiar first order, vector matrix format of modern system theory. These algorithms were applied to a variety of rotorcraft simulation models. Results pertaining to a simulated hingeless rotor helicopter are also presented
    Keywords: Aircraft Stability and Control
    Type: NASA-TM-84324 , A-9220 , NAS 1.15:84324
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  • 18
    Publication Date: 2019-07-12
    Description: Disclosed is a vertical flight path angle steering system for aircraft, utilizing a digital flight control computer which processes pilot control inputs and aircraft response parameters into suitable elevator commands and control information for display to the pilot on a cathode ray tube. The system yields desirable airplane control handling qualities and responses as well as improvements in pilot workload and safety during airplane operation in the terminal area and under windshear conditions.
    Keywords: Aircraft Stability and Control
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  • 19
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    In:  CASI
    Publication Date: 2019-08-15
    Description: CARSRA, a computer program supplied by COSMIC (Computer Software Management and Information Center), enables Hamilton Standard to predict the reliability of electronic systems for jet engines. The flight control is fully automatic. With CARSRA, engineers can study a proposed design, predict its operation, and make necessary design modifications. The program is accurate and flexible, and Hamilton Standard has developed a more advanced program based on the COSMIC software.
    Keywords: Aircraft Stability and Control
    Type: Spinoff 1983; 113
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  • 20
    Publication Date: 2019-07-12
    Description: Aircraft altitude, ground velocity, and altitude rate signals are input to a computer which, using a unique control law, generates a pitch control surface command signal suitable for guiding an aircraft on its flare path to a specified runway touchdown point despite varying wind conditions.
    Keywords: Aircraft Stability and Control
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  • 21
    Publication Date: 2019-07-12
    Description: Upon aircraft landing approach, flare path command signals of altitude, vertical velocity and vertical acceleration are generated as functions of aircraft position and velocity with respect to the ground. The command signals are compared with corresponding actual values to generate error signals which are used to control the flight path.
    Keywords: Aircraft Stability and Control
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  • 22
    Publication Date: 2019-07-13
    Description: A fully coupled vibration model, consisting of a rotor with only flapping degrees of freedom plus pylon and fuselage pitching motion, was used in a parametric study undertaken to investigate the response characteristics of a simplified helicopter. Among the parameters studied were uncoupled body frequency, blade stiffness, hinge offset, advance ratio, and mast height. Results from the harmonic balance solution of the equations of motion show how each of these quantities affects the response of the model. The results also indicate that there is a potential for reducing vibration response through the judicious definition of the design parameters.
    Keywords: Aircraft Stability and Control
    Type: AIAA Paper 81-0616R , Dynamics Specialists Conference; Apr 09, 1981 - Apr 10, 1981; Atlanta, GA; United States|Journal of Aircraft; 19; 4; 297-303
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  • 23
    Publication Date: 2019-07-13
    Description: Inadequacies in the military specification for helicopter handling qualities, MIL-H-8501A, have long been recognized, and the latest procurements by the U.S. Army used special Prime Item Development Specifications (PIDS). This paper assesses the efficacy of these PIDS and suggests that changes should be made. In particular, the structure developed in MIL-F-8785B (ASG) (the specification for flying qualities of piloted airplanes) should be incorporated. Improved requirements must be based on a systematic data base and concentrated on topics most important in preliminary design: static and dynamic stability, control power and sensitivity, and interaction with controllers and displays. Emphasis should be on current military helicopter missions and helicopter idiosyncrasies such as cross-coupling, nonlinearities, and higher-order dynamics.
    Keywords: Aircraft Stability and Control
    Type: AIAA Paper 80-1592R , Atmospheric Flight Mechanics Conference; Aug 11, 1980 - Aug 13, 1980; Danvers, MA; United States|Journal of Aircraft; 19; 2; 138-144
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  • 24
    Publication Date: 2019-07-13
    Description: The three-dimensional leeward separation about a 5-deg semi-angle cone of 11 deg angle of incidence was Investigated in night, in the wind tunnel, and by numerical computations. The test conditions were Mach numbers of 0.6, 1.5, and 1.8 at Reynolds numbers between 7 and 10 million based on freestream conditions and a 76.2-cm (30-in.) length of surface. The surface pressure conditions measured included those of fluctuating and mean static, as well as recovery pressures generated by obstacle blocks to provide skin friction and separation-line locations. The mean static pressures from flight and wind tunnel were in reasonably good agreement. The computed results gave the same distributions, but were slightly more positive in magnitude. The experimentally measured primary and secondary separation line locations compared closely with computed results. There were substantial differences In level between the surface root-mean-square pressure fluctuations obtained in night and in the wind tunnel, due, It Is thought, to a relatively high acoustic disturbance level in the tunnel compared with the quiescent atmospheric conditions in night.
    Keywords: Aerodynamics
    Type: NASA/TM-81-208070 , NAS 1.15:208070 , AIAA Paper 81-0337 , Aerospace Sciences Meeting; Jan 12, 1981 - Jan 15, 1981; Saint Louis, MO; United States|AIAA Journal; 20; 10; 1338-1345
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  • 25
    Publication Date: 2019-07-13
    Description: An implicit finite-difference solver for either the Euler equations or the "thin-layer" Navier-Stokes equations was used to calculate a transonic flow over the NACA 64A010 airfoil pitching about its one-quarter chord. An unsteady automatic grid-generation procedure that will improve significantly the computational efficiency of various unsteady flow problems is described. The calculated results for both inviscid and viscous flows at Mach number 0.8 over the airfoil oscillating with reduced frequency referenced to one-half chord, 0.2, are compared with experimental data measured in the Ames 11 x 11 ft Transonic Wind Tunnel. Nonlinear, unsteady effects of the flow on the surface pressure variations, shock-wave excursions, and overall airloads are examined. Good agreements between the results of computations and experiments were obtained. In the shock-wave region, however, the results of the viscous-flow computations showed closer agreement with the experimental data.
    Keywords: Aerodynamics
    Type: AIAA Paper 79-1554 , AIAA Journal; 19; 6; 684-690|Fluid and Plasma Dynamics; Jul 23, 1979 - Jul 25, 1979; Williamsburg, VA; United States
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  • 26
    Publication Date: 2019-07-13
    Description: Studies have been made on several wing leading-edge modifications applicable at present to single-engine light aircraft, which produce stabilizing vortices at stall and beyond. These vortices have the effect of fixing the stall pattern of the wing such that the various portions of the wing upper surface stall nearly symmetrically. The lift coefficient produced is maintained at a high level to angles of attack significantly above the stall angle of the unmodified wing, and the divergence in roll usually is reduced to a controllable level. It is hypothesized that these characteristics will help prevent inadvertent spin entry after a stall. Results are presented from recent large-scale wind-tunnel tests of a typical light aircraft, both with and without the modifications. The data indicate (hot the static stall and poststall characteristics of this aircraft, in a typical landing-approach condition, are noticeably improved when it suitable leading-edge modification is employed; and also that no appreciable aerodynamic penalties are evident in the normal flight envelope.
    Keywords: Aerodynamics
    Type: NASA/TM-81-207529 , NAS 1.15:207529 , AIAA Paper 78-1476R , Journal of Aircraft; 18; 2; 69-75|Aircraft Systems and Technology Conference; Aug 21, 1978 - Aug 23, 1978; Los Angeles, CA; United States
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  • 27
    Publication Date: 2019-07-13
    Description: An analysis of the relative influences of for-ward lift-enhancing surfaces on the overall lift and drag characteristics of three wind-tunnel models representative of V/STOL fighter/attack aircraft is presented. Two of the models are canard-wing configurations and one has a wing leading-edge extension (LEX) as the forward lifting surface. Data are taken from wind-tunnel tests of each model covering Mach numbers from 0.4 to 1.4. Overall lift and drag characteristics of these models and the generally favorable interactions of the forward surfaces with the wings are highlighted. Results indicate surface that larger LFX's and canards generally give greater lift and drag improvements than ones that are smaller relative to the wings.
    Keywords: Aerodynamics
    Type: NASA/TM-81-207514 , NAS 1.15:207514 , AIAA Paper 81-1675 , Aircraft Systems and Technology Conference; Aug 11, 1981 - Aug 13, 1981; Dayton, OH; United States
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  • 28
    Publication Date: 2019-07-13
    Description: A technique is described for the design of fuel-conservative guidance systems and is applied to a system that was flight tested on board NASA's sugmentor wing jet STOL research aircraft. An important operational feature of the system is its ability to rapidly synthesize fuel-efficient trajectories for a large set of initial aircraft positions, altitudes, and headings. This feature allows the aircraft to be flown efficiently under conditions of changing winds and air traffic control vectors. Rapid synthesis of fuel-efficient trajectories is accomplished in the airborne computer by fast-time trajectory integration using a simplified dynamic performance model of the aircraft. This technique also ensures optimum flap deployment and, for powered-lift STOL aircraft, optimum transition to low-speed flight. Also included in the design is accurate prediction of touchdown time for use in four-dimensional guidance applications. Flight test results have demonstrated that the automatically synthesized trajectories produce significant fuel savings relative to manually flown conventional approaches.
    Keywords: Aircraft Stability and Control
    Type: NASA/TM-81-207527 , NAS 1.26:207527 , AIAA Paper 79-1709 , Journal of Guidance and Control; 4; 3; 253-261|Guidance and Control Conference; Aug 06, 1979 - Aug 08, 1979; Boulder, CO; United States
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  • 29
    Publication Date: 2019-07-13
    Description: Tests were made in the Ames 40 by 80 ft Wind Tunnel of a semispan wing with a nacelle (no propeller) from a typical, general aviation twin-engine aircraft. Measurements were made of the effect on drag of the flow of cooling air through the nacelle. Internal and external nacelle pressures were measured. It was found that the cooling airflow accounts for about 13% of the total estimated airplane drag during both cruise and climb. The now of cooling air through the nacelle accounts for 30% of the airflow drag component during cruise and 42% during climb; the balance, in both cruise and climb, is attributed to [he external shape of the nacelle. It was suggested that improvements could possibly be made by relocating both the inlet and the outlet for the cooling air.
    Keywords: Aerodynamics
    Type: NASA/TM-81-207547 , NAS 1.15:207547 , AIAA Paper 79-1820R , Aircraft Systems and Technology Meeting; Aug 20, 1979 - Aug 22, 1979; New York, NY; United States|Journal of Aircraft; 18; 2; 82-88
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  • 30
    Publication Date: 2019-07-13
    Description: The results of an experimental investigation of shock-induced stall and leading-edge stall on a 64A010 airfoil section are presented. Advanced nonintrusive techniques - laser velocimetry and holographic interferometry - were used in characterizing the inviscid and viscous flow regions. The measurements include Mach contours of the inviscid now regions, and mean velocity, flow direction, and Reynolds shear stress profiles in the separated regions. The experimental observations of this study are relevant to efforts to improve surface-pressure prediction methods for airfoils at or near stall.
    Keywords: Aerodynamics
    Type: NASA/TM-81-207541 , NAS 1.15:207541 , AIAA Paper 79-1500R , Journal of Aircraft; 18; 1; 7-14|Fluid and Plasma Dynamics Conference; Jul 23, 1979 - Jul 24, 1979; Williamsburg, VA; United States
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  • 31
    Publication Date: 2004-12-03
    Description: The turbulent, incompressible reattaching flow over a rearward-facing step has been studied by many researchers over the years. One of the principal quantities determined in these experiments has been the distance from the step to the point (or region) where the separated shear layer reattaches to the surface (x(r)). The values for x(r)/h, where h is the step height, have covered a wider range than can reasonably be attributed to experimental technique or inaccuracy. Often the reason for a largely different value of x(r)/h can be attributed to an incompletely developed turbulent layer, or a transitional or laminar boundary layer. However, for the majority of experiments where the boundary layer is believed to be fully developed and turbulent, x(r)/h still varies several step heights; generally, 5 1/2 approximately 〈 x(r)/h approximately 〈 7 1/2. This observed variation has usually been attributed to such variables as l/h (step length to height, h/delta (step height to initial boundary-layer thickness), R(e)(theta)), or the experimental technique for determining reattachment location. However, there are so many different combinations of variables in the previous experiments that it was not possible to sort out the effects of particular conditions on the location of reattachment. In the present experiment velocity profiles have been measured in and around the region of separated flow. Results show a large influence of adverse pressure gradient on the reattaching flow over a rearward-facing step that has not been reported previously. Further, the many previous experiments for fully developed, turbulent flow in parallel-walled channels have shown a range of reattachment location that has not been explained by differences in initial flow conditions. Although these initial flow conditions might contribute to the observed variation of reattachment location, it appears that the pressure gradient effect can explain most of that variation.
    Keywords: Aerodynamics
    Type: AIAA Journal; Volume 18; No. 3; 343-344
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  • 32
    Publication Date: 2019-07-13
    Description: Conditionally sampled, ensemble-averaged velocity measurements, made with a laser velocimeter, were taken in the flowfield over the rear half of an 18% thick circular arc airfoil at zero incidence tested at M = 0.76 and of a Reynolds number based on chord of 11 x 10(exp 6). Data for one cycle of periodic unsteady flow having a reduced frequency bar-f of 0.49 are analyzed. A series of compression waves, which develop in the early stages of the cycle, strengthen and coalesce into a strong shock wave that moves toward the airfoil leading edge. A thick shear layer forms downstream of the shock wave. The kinetic energy and shear stresses increase dramatically, reach a maximum when dissipation and diffusion of the turbulence exceed production, and then decrease substantially. The response time of the turbulence to the changes brought about by the shock-wave passage upstream depends on the shock-wave strength and position in the boundary layer. The cycle completes itself when the shock wave passes the midchord, weakens, and the shear layer collapses. Remarkably good comparisons are found with computations that employ the time-dependent Reynolds averaged form of the Navier-Stokes equations using an algebraic eddy viscosity model, developed for steady flows.
    Keywords: Aerodynamics
    Type: AIAA Paper 79-0071R , AIAA Journal; 18; 5; 489-496|Aerospace Sciences; Jan 15, 1979 - Jan 17, 1979; New Orleans, LA; United States
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    Publication Date: 2019-07-13
    Description: A detailed Investigation of a flow in which a three-dimensional shock wave separates a two-dimensional turbulent boundary layer is presented. The resulting flowfield is highly three dimensional with a significant portion of flow separation on the surface at the phi = 0 deg (windward) plane was well as a large zone of secondary surface flow off this plane. Mean and fluctuating experimental measurements were obtained throughout the entire flowfield. These measurements included mean pressures, flow angles and shear on the surface, as well as yaw angles, static pressures, turbulent shear stresses, and turbulent kinetic energies on selected planes throughout the flowfield. In addition, numerical predictions of this flow, obtained by solving the Navier-Stokes equations with an algebraic eddy viscosity turbulence model, are presented. These computations reasonably predict both the surface and flowfield quantities, despite the extremely complicated nature of the experimental flow.
    Keywords: Aerodynamics
    Type: AIAA Paper 80-0002R , Aerospace Sciences; Jan 14, 1980 - Jan 16, 1980; Pasadena, CA; United States|AIAA Journal; 18; 12; 1477-1484
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  • 34
    Publication Date: 2019-07-13
    Description: A fast, fully implicit approximate factorization algorithm designed to solve the conservative, transonic, full-potential equation in either two or three dimensions is described. The algorithm uses an upwind bias of the density coefficient for stability in supersonic regions. This provides an effective upwind difference of the streamwise terms for any orientation of the velocity vector (i.e., rotated differencing), thereby greatly enhancing the reliability of the present algorithm. A numerical transformation is used to establish an arbitrary body-fitted, finite-difference mesh. Computed results for both airfoils and simplified wings demonstrate substantial improvement in convergence speed for the new algorithm relative to standard successive-line over-relaxation algorithms.
    Keywords: Aerodynamics
    Type: NASA/TM-80-208091 , NAS 1.15:208091 , AIAA Paper 79-1456 , AIAA Journal; 18; 12; 1431-1439|Computational Fluid Dynamics Conference; Jul 23, 1979 - Jul 26, 1979; Williamsburg, VA; United States
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  • 35
    Publication Date: 2019-07-13
    Description: A mixed explicit-implicit scheme is used to solve the time-dependent thin-layer approximation of the Navier-Stokes equations for a supersonic laminar flow over an inclined body of revolution. Test cases for Mach 2.8 flow over a cylinder with 15-deg flare angle at angles of attack of 0,1, and 4 deg are calculated. Good agreement is obtained between the present computed results and experimental measurements of surface pressure. A pair of vortices on the leeward and a peak in the normal force distribution near the flared juncture are predicted; the role of circumferential communication is discussed.
    Keywords: Aerodynamics
    Type: NASA/TM-1980-207892 , NAS 1.15:207892 , AIAA Paper 79-1547 , AIAA Journal; 18; 8; 921-928|Fluid and Plasma Dynamics Conference; Jul 23, 1979 - Jul 25, 1979; Williamsburg, VA; United States
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  • 36
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    Chemie Ingenieur Technik - CIT 26 (1954), S. 1-1 
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
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    Chemie Ingenieur Technik - CIT 26 (1954) 
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    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
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    Notes: Aus umfangreichen Untersuchungen an den verschiedensten Trocknertypen1 wird in dieser Arbeit über die Ergebnisse berichtet, die an Tunnel-, Mulden- sowie Stromtrocknern erhalten wurden. Die Versuche hatten den Zweck, rechnerische Unterlagen für den Entwurf der Trockner zu schaffen.
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    Chemie Ingenieur Technik - CIT 26 (1954), S. 14-18 
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    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
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    Notes: Die Erzeugung der technisch wichtigen spezifischen Oberflächen am Beispiel von Quarzsand bei fort-schreitender Schwingmahlung wird in weitem Feinheitsbereich verfolgt; die jeweils aus Siebanalyse bzw. Körnungsnetz erhaltenen idealisierten Oberflächen und die Oberflächen nach dem Blaine-Test werden mit der zunächst physikalish am besten definierten Oberfläche nach der Argon-Adsorptionsmethode verglichen und wesentliche zerkleinerungsphysikalische Folgerungen gezogen sowie Bewertungsfragen beantwortet.
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    Notes: In der Verfahrenstechnik sind häufig Prozesse durchzuführen, bei denen Mehrstoffgemische mit einer flüssigen oder gasförmigen Phase behandelt werden müssen. Die bei diesen Verfahren auftretenden strömungstechnischen Probleme sind bisher von der klassischen Strömungslehre nur sehr wenig erörtert worden. Die folgenden Ausführungen zeigen, wie auf diesem Gebiete durch Anwendung strömungstechnischer Methoden praktisch wichtige Erkenntnisse gewonnen werden können.
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    Notes: Beschrieben werden ein Verfahren sowie eine Meßanordnung, mit denen die Wämeleitfähigkeit λ, die Wärmekapazität cλ und die Wärmeeindringzahl \documentclass{article}\pagestyle{empty}\begin{document}$\sqrt {\lambda c\gamma } $\end{document} in einem Kurzversuch gleichzettig bestimmt werden können.
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    Chemie Ingenieur Technik - CIT 26 (1954), S. 44-51 
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    Source: Wiley InterScience Backfile Collection 1832-2000
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    Notes: In einer Versuchsanlage wurden Wärmeübergang und Druckabfall verschiedener Speichermassen gemessen. Auf Grund dieser und früherer Versuche wurden Heizflächenbedarf und Heizflächenkosten unter gleichen energetischen Bedingungen für längs durchströmte Rohre verschiedenen Durchmessers, Kugelschüttungen, Raschig-Ringfüllungen sowie Riffeleinsätze ermittelt. Am Beispiel der Regeneratoren von Linde-Fränkl-Anlagen werden die Vorteile gegenüber Röhren-Wärmeaustauschern diskutiert. Die Versuche sind noch nicht abgeschlossen.
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    Chemie Ingenieur Technik - CIT 26 (1954), S. 55-56 
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    Chemie Ingenieur Technik - CIT 26 (1954), S. 57-59 
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    Chemie Ingenieur Technik - CIT 26 (1954), S. 59-60 
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    Chemie Ingenieur Technik - CIT 26 (1954), S. 65-72 
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    Notes: Chemie und Hüttenkunde sind keine getrennten Forschungsgebiete. Lediglich ihre äußere und industrielle Geschichte führte zu zwei verschiedenen Bezeichnungen, die auch heute noch beibehalten werden. In Wirklichkeit aber überschneiden sich gerade in den letzten Jahrzehnten die beiden Wissenschaftszweige in zunehmendem Maße. Der Einfluß der reinen Chemie auf die Hüttenkunde wird an vielen Beispielen erläutert.
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    Notes: Nachdem bereits über das Grundprinzip des Sorbogen-I-Verfahens berichtet wurde, soll hier seine Anwendung bei der Abscheidung von Wasser, Kohlendioxyd und Acetylen aus zu zerlegender Luft in einer Reinigungsanlage beschrieben werden. Die Anlage arbeitet mit Aktivkohle als Adsorbens bei Normaltemperatur und mäßig erhöhtem Druck und bildet den vorgeschalteten Teil einer Luftzerlegungsanlage. Das Verfahren bietet gegenüber älteren Anlagen wirtschaftliche Vorteile. Es wird ein Reinheitsgrad von einigen Hundertstel pM (1 pM = 1 ċ 10-4%) Kohlendioxyd und eine völlige Entfernung von Acetylen und Wasserdampf ohne zusätzlichen Energieaufwand erreicht.
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    Notes: Nach dem Theorem der übereinstimmenden Zustände sollten die reduzierten Dampfdruckkurven verschiedener nicht assoziierter Stoffe zusammenfallen. Tatsächlich bilden sie jedoch in guter Näherung eine einparametrige Kurvenschar. Durch Einführung eines stoffspezifischen „kritischen Parameters“ gelingt es, eine die Meßwerte befriedigend darstellende Gleichung dieser Kurvenschar zu entwickeln, mit deren Hilfe man die ganze Dampfdruckkurve einer Substanz berechnen kann, wenn der kritische Punkt und der normale Siedepunkt bekannt sind. Kennt man aus Messungen den Dampfdruck bei zwei beliebigen Temperaturen, so läßt sich auch der kritische Druck mit einiger Zuverlässigkeit abschätzen. Zur Erleichterung der Anwendung werden die in der Gleichung auftretenden Temperaturfunktionen tabellarisch wiedergegeben. An verschiedenen Beispielen wird die Brauchbarkeit der neuen Dampfdruckformel gezeigt.
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    Chemie Ingenieur Technik - CIT 26 (1954), S. 94-96 
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    Keywords: Chemistry ; Industrial Chemistry
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    Notes: Die konstruktiven Voraussetzungen für Laboratoriumszentrifugen mit bisher in der Praxis nicht erreichbaren Fliehkräften werden dargelegt. Das entwickelte Gerät, das im Gegensatz zu anderen Bauarten nur eine einzige radial um die Drehachse rotierende Zelle für die Einsatzflüssigkeit besitzt, wird beschrieben. Es ermöglicht bei 84 000 U/min Normalbeschleunigungen von 584 000 g, bei 120 000 U/min und kleineren Präparatmengen von 915 000 g. Besondere Einsätze zur Erfassung des Sediments bringen bei präparativen und möglicherweise auch analytischen Arbeiten besondere Vorteile.
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    Chemie Ingenieur Technik - CIT 26 (1954), S. 118-120 
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    Chemie Ingenieur Technik - CIT 26 (1954), S. 106-112 
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    Chemie Ingenieur Technik - CIT 26 (1954), S. 113-114 
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    Chemie Ingenieur Technik - CIT 26 (1954), S. 117-117 
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    Chemie Ingenieur Technik - CIT 26 (1954), S. 121-129 
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    Notes: Während der Hauptversammlung der Deutschen Bunsengesellschaft 1953 in Duisburg wurden unter dem Hauptthema „Die physikalisch-chemischen Grundlagen der technischen Reaktionsführung“ durch zusammenfassende Vorträge und Originalmitteilungen Beiträge zum wissenschaftlichen Verständnis und zur technischen Beherrschung der Reaktionsapparate gebracht, die im folgenden zusammenfassend referiert werdenDie sechs zusammenfassenden Vorträge zum Hauptthema sowie eine Reihe weiterer fachlicher Vorträge sind veröffentlicht in Z. Elektrochem., Ber. Bunsenges. physik. Chem. 57, Nr. 7 [1953]. Diesen Arbeiten ist auch der größte Teil der hier wiedergegebenen Bilder entnommen.
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    Chemie Ingenieur Technik - CIT 26 (1954), S. 140-140 
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    Chemie Ingenieur Technik - CIT 26 (1954), S. 150-155 
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    Notes: Um ein Urteil über die Brauchbarkeit von Mischgeräten zu gewinnen, wurden auf Grund statistischer Überlegungen für Gemische aus zwei Komponenten Formeln entwickelt, die ein Maß für die Güte der Mischung abgeben.
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    Chemie Ingenieur Technik - CIT 26 (1954), S. 169-169 
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    Chemie Ingenieur Technik - CIT 26 (1954), S. 170-171 
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    Chemie Ingenieur Technik - CIT 26 (1954), S. 172-172 
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    Notes: Vergleicht man die chemische Industrie der Deutschen Bundesrepublik mit der des Auslandes, so zeigt sich, daß unsere Industrie billiger produzieren muß. Kontinuierliche Verfahren sind deshalb von größtem Interesse. Aus den wichtigsten Grundverfahren werden Beispiele herausgegriffen, an denen die voraussichtliche künftige technische Entwicklung aufgezeigt wird. Zwangsläufig ergeben sich hieraus die Aufgaben, die der deutsche Apparatebau zu lösen hat.
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    Chemie Ingenieur Technik - CIT 26 (1954), S. 202-205 
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    Notes: Die Drehöfen mit balligen und oberflächengeschmierten Tragrollen wurden im Laufe der vergangenen beiden Jahre weiterentwickelt. Die im Betrieb mit diesen Lagerungen erzielten Erfahrungen werden mitgeteilt. Vor etwa 2 Jahren war darauf hingewiesen worden1, daß Mängel der bisherigen Drehofenlagerungen dadurch zu beseitigen sind, daß die Funktion des Ofentragens grundsätzlich von der Ofenlängsführung getrennt wird.
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    Chemie Ingenieur Technik - CIT 26 (1954), S. 205-205 
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    Chemie Ingenieur Technik - CIT 26 (1954), S. 226-228 
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    Chemie Ingenieur Technik - CIT 26 (1954), S. 189-201 
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    Notes: Die Zentrifuge gestattet die Durchführung von Sedimentationen bei verstärkter Fallbeschleunigung und von Filtrationen bei erhöhtem Bodendruck. Die Formeln für den Verstärkungsfaktor werden angegeben und Modellgesetze entwickelt. Die Separationskennzahl kennzeichnet den Klassier- bzw. Abscheidungseffekt die Nutzungskennzahl die Inanspruchnahme der Läuferfestigkeit. Der Leistungsbedarf von Zentrifuge und Hydrozyklon wird diskutiert. Eine stystematische Übersicht ordnet die bekannten Zentrifugentypen nach konstruktiven Gesichtspunkten. Eine Gegenüberstellung führt die Grundtypen von Schleudern auf die Prinzipien statischer Trennapparate zurück. Außer den handelsüblichen Schleudern werden Zentrifugal-Extraktoren, Hydrozyklone und Gaszentrifugen als Varianten der Zentrifuge kurz besprochen.
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    Chemie Ingenieur Technik - CIT 26 (1954), S. 231-231 
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    Chemie Ingenieur Technik - CIT 26 (1954), S. 232-233 
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    Chemie Ingenieur Technik - CIT 26 (1954), S. 237-238 
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    Chemie Ingenieur Technik - CIT 26 (1954), S. 239-244 
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    Chemie Ingenieur Technik - CIT 26 (1954), S. 259-264 
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    Source: Wiley InterScience Backfile Collection 1832-2000
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    Notes: Wenn man die Meßwerte für die reduzierte (d. h. auf den kritischen Zustand bezogene) Dichte aesättigter Flüssigkeiten in Abhängigkeit von der reduzierten Temperatur aufträgt, so erhält man, ähnlich wie beim Dampfdruck, keine einheitliche Kurve, wie es das Theorem der übereinstimmenden Zustände in der üblichen Fassung verlangt, sondern eine einparametrige Kurvenschar. Für diese wird eine der Erfahrung angepaßte Gleichung aufgestellt, die den auch für die Dampfdruckkurve maßgebenden „kritischen Parameter“ enthält. Durch Einführung der Nullpunktsdichte statt der kritischen Dichte ergibt sich eine vom kritischen Parameter weitgehend unabhängige Funktion, die tabellarisch wiedergegeben wird und deren Anwendungsmöglichkeiten diskutiert und an Hand von Zahlenbeispielen erläutert werden. Das auf den absoluten Nullpunkt extrapolierte Molvolumen zeigt bei Kohlenwasserstoffen präzise Zusammenhänge mit der Struktur der Molekeln. Zur Abschätzung des kritischen Volumens organischer Verbindungen wird eine Zusammenstellung der Meßwerte und ein System von Substitutionsinkrementen angegeben.
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    Chemie Ingenieur Technik - CIT 26 (1954), S. 269-269 
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    Chemie Ingenieur Technik - CIT 26 (1954), S. 281-284 
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    Notes: Nach einer grundsätzlichen Betrachtung des Ausmauerungs-Problems werden allgemeine Formeln zur Ermittlung der Spannungen und Dehnungen angegeben, die in einer Kugelschale unter dem Einfluß des Druckes und eines Temperaturgefälles auftreten. Hieraus wird für den ausgemauerten, kugelförmigen Behälter eine Bedingung hergeleitet, deren Erfüllung gewährleistet, daß sich das Mauerwerk vom Eisenmantel nicht ablöst. Die Verwendung von quellendem Kitt bringt Vorteile. Abschließend werden die im Mauerwerk und im Eisenmantel auftretenden Spannungen ermittelt.
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    Notes: Im I. Teil wurde der Quertrieb in sedimentierenden Teilchenschüttungen untersucht. Nachfolgend wird gezeigt, daß auch in laminar strömenden wäßrigen Elektrolytlösungen ein Quertrieb entsteht, infolgedessen die größeren lonen bevorzugt in den Bereich höherer Strömungsgeschwindigkeit, also in den achsennahen Bereich diffundieren. Diese Versuche lassen Schlüsse auf die lonenhydratation zu. Außerdem wurde der Quertrieb in laminar strömender Luft mit sehr hoher Strömungsgeschwindigkeit, z. B. im Wirbelrohr, beobachtet. Auch dort ergibt sich für die größeren Molekeln eine Anreicherung im achsennahen Bereich, d. h. eine O2-Anreicherung im Kaltgasanteil. Abschließend werden die Ergebnisse in den einzelnen Aggregatzuständen miteinander verglichen.
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    Chemie Ingenieur Technik - CIT 26 (1954), S. 291-291 
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    Chemie Ingenieur Technik - CIT 26 (1954), S. 290-290 
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    Chemie Ingenieur Technik - CIT 26 (1954), S. 292-292 
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    Chemie Ingenieur Technik - CIT 26 (1954), S. 295-297 
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    Chemie Ingenieur Technik - CIT 26 (1954), S. 297-300 
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    Chemie Ingenieur Technik - CIT 26 (1954), S. 294-294 
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    Chemie Ingenieur Technik - CIT 26 (1954), S. 325-326 
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    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: In der Literatur werden mit Destillationslinien zwei verschiedene Arten von Linien bezeichnet, durch welche das Verdampfungsgleichgewicht dargestellt werden kann. Für beide Kurvenarten werden Gleichungen angegeben und die Besonderheiten diskutiert, die sich für solche ideale Systeme ergeben, bei denen die Quotienten aus den Dampfdrucken der Komponenten im betrachteten Gebiet als temperaturunabhängig angesehen werden können.
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    Chemie Ingenieur Technik - CIT 26 (1954), S. 311-320 
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    Notes: Eine nach physikalischen Gesichtspunkten vorgenommene Einteilung der Zerstäubertypen gestattet es, für gewisse Typen den größten bei der Zerstäubung entstehenden Tropfen mit Hilfe einer auf Ähnlichkeitsbetrachtungen aufgebauten Gleichung zu berechnen. Dieser ist die Annahme zugrunde gelegt, daß ein Flüssigkeitstropfen auf Grund rotationssymmetrischer Schwingungen zerfällt. Weiter wird unter der Voraussetzung eines Austauschvorganges zwischen den Tropfen im Zerstäubungsraum mit Hilfe der Methoden der klassischen Statistik ein für gewisse Zerstäubertypen geltendes Tropfenverteilungsgesetz aufgestellt, welches an fremden und eigenen Versuchen geprüft wird. Für diese Zerstäubertypen läßt sich nun die Tropfenkennlinie ohne Versuche rechnerisch bestimmen.
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    Chemie Ingenieur Technik - CIT 26 (1954), S. 321-324 
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    Notes: Es wird eine mit Hilfe eines Wechselstrommagneten vibrierende Platin-Mikroelektrode beschrieben. In Verbindung mit einem Polarographen wird mit der Mikroelektrode die Abhängigkeit des Diffusionsstromes von der Depolarisatorkonzentration, der Elektrodengeschwindigkeit und der Temperatur untersucht. Bei der Aufnahme von Sauerstoff-Polarogrammen treten Erscheinungen auf, die für die Platin-Elektrode charakteristisch sind. Der Umsatz an der Elektrode, der unter den gewählten Versuchsbedingungen bei wiederholter Analyse derselben Lösung (Sauerstoff, Jodid) stattfindet, wird in guter Übereinstimmung mit den experimentellen Werten auch rechnerisch ermittelt.
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    Chemie Ingenieur Technik - CIT 26 (1954), S. 339-339 
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    Chemie Ingenieur Technik - CIT 26 (1954), S. 331-337 
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    Source: Wiley InterScience Backfile Collection 1832-2000
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    Notes: Der in einem Gerät asymptotisch erreichbare Grenzwert des Gütemaßes einer Mischung kann von dem Gütemaß einer Zufallsmischung abweichen. Ein Mischer ist um so besser, je geringer diese Abweichungen sind und je rascher er den „Endzustand“ herstellt. Es wird untersucht, wie der Gleichförmigkeitsgrad einer Zufallsmischung aus körnigen Stoffen von den verschiedenen Einflußgrößen abhängt, nämlich den relativen Gewichtsanteilen der Mischungskomponenten, dem Zerkleinerungsgrad, der Gleichmäßigkeit der Zerkleinerung sowie der Größe der herausgegriffenen Stichproben. Der gefundene funktionale Zusammenhang schließt einige im Schrifttum bereits bekannte Sonderfälle ein. Er wird durch Versuche mit Formsand geprüft; dabei stimmen die Ergebnisse der Versuche mit der Rechnung gut überein.
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    Chemie Ingenieur Technik - CIT 26 (1954), S. 293-294 
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    Chemie Ingenieur Technik - CIT 26 (1954), S. 351-352 
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    Chemie Ingenieur Technik - CIT 26 (1954), S. 353-356 
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    Chemie Ingenieur Technik - CIT 26 (1954), S. 387-392 
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    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Es wird ein Überblick über die in der Industrie verwendeten Gemengeanlagen gegeben, wobei vor allem die diskontinuierlich arbeitenden Reihen- und Turmanlagen ausführlicher behandelt werden. Die kontinuierlich arbeitenden Anlagen werden kürzer behandelt, da auf die Dosierbandwaage schon früher in dieser Zeitschrift1 eingegangen wurde.
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    Chemie Ingenieur Technik - CIT 26 (1954), S. 357-379 
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    Notes: Im Anschluß an die im Vorjahr hier gegebene Übersicht1 über die Technische Messe Hannover, soweit sie Chemie und Chemiebedarf betraf, wird im folgenden über die in diesem Jahr (25. 4. bis 4. 5.) veranstaltete Technische Messe berichtet. Es wird ein Überblick über die in der Halle „Chemie und Kunststoffe“ gezeigten Neuerungen und Besonderheiten gegeben und über Neuentwicklungen bei Pumpen, Verdichtern, Vakuumanlagen, Armaturen, Rohrleitungen, Dichtungen, Apparaten zum Zerkleinern, Mischen und Trennen, bei betriebstechnischen Meß- und Regelgeräten, Laboratoriums-Instrumenten und all-gemeinem Fabrik-Bedarf berichtet. Bei der Fülle des Gezeigten erhebt dieser Beitrag keinen Anspruch auf Vollständigkeit.
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    Chemie Ingenieur Technik - CIT 26 (1954), S. 400-400 
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    Chemie Ingenieur Technik - CIT 26 (1954), S. 401-404 
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    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Es werden mehrere vollautomatische, diskontinuierliche und kontinuierliche Analysengeräte beschrieben, die auf dem Prinzip der colorimetrischen Messung beruhen. Neben Durchflußgeräten für farbige Lösungen werden Geräte für die kontinuierliche und intermittierende Analyse von farblosen Lösungen und Gasen beschrieben, bei denen solche Reagenzien automatisch zugesetzt werden, welche eine der Konzentration der Lösung oder des Gases entsprechende Verfärbung hervorrufen, die lichtelektrisch gemessen wird.
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    Notes: Gleitringdichtungen werden in steigendem Maße für drehende Wellen angewendet, weil sie genau so gut selbsttätig abdichten wie Manschetten und außerdem auch für harte Laufwerkstoffe benutzt werden können. Das Dichtungsprinzip bleibt auch dann erhalten, wenn die Dichtungsteile stillstehend im Gehäuse angeordnet werden und die sich bewegende Lauffläche von einem Wellenbund gebildet wird. Die Anwendung von Gleitringdichtungen zur Abdichtung gegen reine flüssige oder homogene zähe Stoffe wird bereits weitgehend beherrscht. Körnige oder faserige Zusätze oder Verschmutzungen des Fördergutes verlangen Sonderkonstruktionen. Gleitringdichtungen für Gasabdichtung bedürfen noch der Erprobung.
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    Chemie Ingenieur Technik - CIT 26 (1954), S. 420-420 
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    Chemie Ingenieur Technik - CIT 26 (1954), S. 421-422 
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    Chemie Ingenieur Technik - CIT 26 (1954), S. 425-425 
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    Chemie Ingenieur Technik - CIT 26 (1954), S. 538-543 
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    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Im folgenden werden die hochschmelzenden Metalle und einige ihrer Legierungen besprochen, wobei nach einer kurzen Beschreibung ihrer Herstellung und Verarbeitung und einer Charakterisierung ihres Korrosionsverhaltens unter normalen und besonders hervorzuhebenden Bedingungen auf die speziellen Anwendungsgebiete und die Anwendungsmöglichkeiten im Apparatebau hingewiesen wird.
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