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  • Chemical Engineering  (48)
  • FLUID MECHANICS AND HEAT TRANSFER  (38)
  • Fisheries
  • GENERAL
  • Inorganic Chemistry
  • 1990-1994
  • 1975-1979  (112)
  • 1955-1959
  • 1976  (112)
Collection
Keywords
Publisher
Years
  • 1990-1994
  • 1975-1979  (112)
  • 1955-1959
Year
  • 1
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    An experimental and computational investigation of the flow field about a transonic airfoil in supercritical flow with turbulent boundary-layer separation (1976)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A combined experimental and computational research program is described for testing and guiding turbulence modeling within regions of separation induced by shock waves incident in turbulent boundary layers. Specifically, studies are made of the separated flow the rear portion of an 18%-thick circular-arc airfoil at zero angle of attack in high Reynolds number supercritical flow. The measurements include distributions of surface static pressure and local skin friction. The instruments employed include highfrequency response pressure cells and a large array of surface hot-wire skin-friction gages. Computations at the experimental flow conditions are made using time-dependent solutions of ensemble-averaged Navier-Stokes equations, plus additional equations for the turbulence modeling.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-TM-X-73157 , A-6690
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
    Electronic Resource
    Electronic Resource
    Drop size distributions and coalescence frequencies of liquid-liquid dispersions in flow vessels (1976)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 22 (1976), S. 289-297 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A flash photomicrographic method and modified dye-light transmittance technique are employed to measure size distributions and mixing frequencies in a turbulently agitated flow vessel. This liquid-liquid dispersion is nearly spatially homogenous. Mixing frequencies are strongly dependent on impeller speed and moderately dependent on holdup fraction.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690220211
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  • 3
    Electronic Resource
    Electronic Resource
    An examination of the adaptive random search technique (1976)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 22 (1976), S. 744-750 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Random search procedures have recently been successfully applied to the optimization of a variety of chemical engineering problems, including optimization of chemical processes by flow sheet simulation. These procedures represent the independent variables as random variables described by probability distributions. The adaptive random search procedure centers the distribution for each variable about the best search point found and examines this region for a better point. Thus, this technique has the ability of continuously moving the search region toward the optimum, which is particularly advantageous in following constraints.This study examines the efficiency of the adaptive random search technique as applied to six different problems, which have been previously solved by various other techniques.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690220417
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  • 4
    Electronic Resource
    Electronic Resource
    Denitrification kinetics in packed beds (1976)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 22 (1976), S. 851-855 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Bench scale packed columns were used to study the kinetic behavior of biological denitrification. After tracer studies were run to determine flow characteristics, steady state nitrate profiles were determined. A first-order rate expression with an Arrhenius temperature dependence is an adequate model of the reaction for nitrate-nitrogen concentrations of 〈 100 mg/l and temperature of 5° to 20°C. The rate constants are proportional to the packing surface area.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690220506
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  • 5
    Electronic Resource
    Electronic Resource
    Nonlinear viscoelasticity of “hard elastic” polypropylene fibers (1976)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 16 (1976), S. 406-410 
    Details
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: “Hard elastic” polypropylene fibers respond nonlinearly to stress at all strains. Low tenacities at break (less than 1 g/denier), low moduli of elasticity (slopes of stress-strain curves from 2.8 to 28 g/denier), and large breaking extensions (over 800 percent) are characteristic of “hard elastic” fibers. Behavior in simple extension, cyclic extension, and stress relaxation can be represented by a quasi-linear viscoelastic model which uses a continuous relaxation spectrum and a quasilinear relation between stress history T(t)and strain history λ(t): \documentclass{article}\pagestyle{empty}\begin{document}$$ T(t) = T^e [\lambda (t)] + \int_0^t {T^e [\lambda (\tau)]\dot G(t - \tau){\rm d}\tau } $$\end{document} where Te[λ(t)] is the elastic response. When creep data are available, this model should provide a unified representation of experimental observations.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760160605
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  • 6
    Electronic Resource
    Electronic Resource
    Transition Metal Chloride Chelates with 1,10-Phenanthroline N-Oxide (1976)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 422 (1976), S. 182-192 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Übergangsmetall-Chlorid-Chelate mit 1.10-Phenanthrolin-N-Oxyd1.10-Phenanthrolin-N-Oxyd(L) reagiert mit 3d Metall-Chloriden unter Bildung folgender Chelate: [CrL2Cl2]Cl · H2O; [FeL2CI2]Cl; [FeLCl2]x (x = 1 oder 2); [MnL2Cl2]; [ClLMnCl2MnLCl] · 2 H2O; [CoL2Cl2] · H2O; [CoLCl2] · H2O; [NiL2Cl2] · 2 H2O; [CuL2Cl]Cl · 2H2O oder [CuL2Cl2] · 2 H2O; und [ZnL3][ZnCl4] · 2 H2O. Diese Chelate wurden mittels Infrarot- und Elektronen-Spektren und magnetischer, röntgenographischer und konduktometrischer Messungen charakterisiert.
    Notes: 1,10-Phenanthroline N-oxide(L) interacts with 3d metal chlorides to yield the following chelates: [CrL2Cl2]Cl · H2O; [FeL2Cl2]Cl; [FeLCl2]x (x = 1 or 2); [MnL2Cl2]; [ClLMnCl2MnLCl] · 2 H2O; [CoL2Cl2] · H2O; [CoLCl2] · H2O; [NiL2Cl2] · 2 H2O; [CuL2Cl]Cl · 2 H2O or [CuL2Cl2] · 2 H2O; and [ZnL3][ZnCl4] · 2 H2O. These complexes were characterized by means of their infrared and electronic spectra, magnetic susceptibilties, X-ray powder diffraction patterns and molar conductivities.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19764220211
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  • 7
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    An analytical study of reduced-gravity flow dynamics (1976)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Addition of surface tension forces to a marker-and-cell code and the performance of four incompressible fluid simulations in reduced gravity, were studied. This marker-and-cell code has a variable grid capability with arbitrary curved boundaries and time dependent acceleration fields. The surface tension logic includes a spline fit of surface marker particles as well as contact angle logic for straight and curved wall boundaries. Three types of flow motion were simulated with the improved code: impulsive settling in a model Centaur LH2 tank, continuous settling in a model and full scale Centaur LO2 tank and mixing in a Centaur LH2 tank. The impulsive settling case confirmed a drop tower analysis which indicated more orderly fluid collection flow patterns with this method providing a potential savings in settling propellants. In the LO2 tank, fluid collection and flow simulation into the thrust barrel were achieved. The mixing simulation produced good results indicating both the development of the flow field and fluid interface behavior.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-CR-135023 , CASD-NAS-76-015
    Format: application/pdf
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  • 8
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    Analyses of ACPL thermal/fluid conditioning system (1976)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Results of engineering analyses are reported. Initial computations were made using a modified control transfer function where the systems performance was characterized parametrically using an analytical model. The analytical model was revised to represent the latest expansion chamber fluid manifold design, and systems performance predictions were made. Parameters which were independently varied in these computations are listed. Systems predictions which were used to characterize performance are primarily transient computer plots comparing the deviation between average chamber temperature and the chamber temperature requirement. Additional computer plots were prepared. Results of parametric computations with the latest fluid manifold design are included.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-CR-150065
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  • 9
    Electronic Resource
    Electronic Resource
    Die Molekül- und Kristallstruktur von C7H7RuC7H9 - (1-5-ν-cycloheptadienyl)(1-5-ν-cycloheptatrienyl)-ruthenium(II) (1976)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 109 (1976), S. 125-131 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The Crystal and Molecular Structure of C7H7RuC7H9 - (1-5-ν- Cycloheptadienyl)(1-5-ν-cyclohepatrienyl)ruthenium(II)The structure of the title compound 5 has been determined by X-ray diffraction. The compound crystallizes in the space group P21/n, a = 644.2 ± 0.1 pm, b = 01775.8 ± 0.2 pm., c = 989.9 ± 0.1 pm, β = 97.72 ± 0.02°, Z = 4 (R = 0.035). The ruthenium atom is coordinated by a cyclohephtadienyl and cycloheptatrienyl ligand, both functioning as five electron ligands. One double bond of the cycloheptarienyl ligand does not interact with the central atom.
    Notes: Mittels Röntgenanalyse wurde die Struktur der Titelverbindung 5 bestimmt. Der Komplex kristallisiert in der Raumgruppe p21/n, a = 644 ±0.1pm, b = 1775.8 ± 0.2pm, c = 989 ± 0.1pm, β = 97.72 ± 0.02°, Z = 4 (R + 0.035). Das Ruthenium ist im Komplex jeweils von einem Cycloheptadienyl- und Cycloheptarienylliganden koordiniert. Beide fungieren als 5-Elektronenliganden, wobei im Cycloheptarienylligand eine Doppelbindung nicht in Wechselwirkung mit dem Zentralatom ist.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19761090111
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  • 10
    Electronic Resource
    Electronic Resource
    Infrarotlaser-spezifische Reaktionen von Bor-Verbindungen, V. Mercaptoborane aus der Reaktion von Diboran mit Schwefelwasserstoff (1976)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 109 (1976), S. 3331-3338 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: I. R. Laser-specific Reactions of Boron Compounds, VMercaptoboranes from the Reaction of Diborane with Hydrogen SulfideThe new and unstable compounds HB(SH)2 (1) and HB(SD)2 are formed by CO2-laser irradiation of a gaseous mixture of B2H6 and H2S or D2S, respectively. In addition, μ-mercapto-diborane, HSB2H5 (2), has been obtained. None of these compounds is produced in the thermal reaction of B2H6 and H2S.
    Notes: Die neuen, instabilen Verbindungen HB(SH)2 (1) und HB(SD)2 bilden sich bei der CO2-Laserbestrahlung eines Gasgemisches von B2H6 und H2S bzw. D2S. Außerdem wurde μ-Mercaptodiboran, HSB2H5 (2), erhalten. Keine dieser Verbindungen entsteht bei der thermisch angeregten Reaktion von B2H6 mit H2S.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19761091008
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