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  • Fluid Mechanics and Thermodynamics  (411)
  • 2005-2009  (196)
  • 2000-2004  (215)
  • 2005  (196)
  • 2001  (215)
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  • 2005-2009  (196)
  • 2000-2004  (215)
Year
  • 1
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    Fluid bubble eliminator (2005)
    In:  CASI
    Details
    Publication Date: 2019-08-27
    Description: A gas-liquid separator uses a helical passageway to impart a spiral motion to a fluid passing therethrough. The centrifugal fore generated by the spiraling motion urges the liquid component of the fluid radially outward which forces the gas component radially inward. The gas component is then filtered through a gas-permeable, liquid-impervious membrane and discharged through a central passageway.
    Keywords: Fluid Mechanics and Thermodynamics
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  • 2
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    Vapor Bubbles in Flow and Acoustic Fields (2001)
    In:  Other Sources
    Details
    Publication Date: 2019-08-17
    Description: The paper presents an order-of-magnitude analysis of the physical processes occurring during the pulsations of a vapor bubble subject to a sound field and shows several numerical examples relating to vapor bubbles in water with and without a translational velocity relative to the liquid. Finally, the growth and collapse of a bubble in a small tube under the action of a heat pulse is considered and it is pointed out that, in suitable conditions, a potentially useful pumping effect without mechanical moving parts can be achieved.
    Keywords: Fluid Mechanics and Thermodynamics
    Type: IUTAM Symposium on Free Surface Flows; Unknown|IUTAM Symposium on Free Surface Flows; 249-256
    Format: text
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  • 3
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    Asymmetry Effects in Numerical Simulation of Supersonic Flows with Upstream Separated Regions (2001)
    In:  CASI
    Details
    Publication Date: 2019-08-15
    Description: The present paper studies the numerical simulation of flows with shock/boundary-layer upstream interaction, under conditions of symmetry in geometry, boundary conditions, and grid. For this purpose, a series of two- and three-dimensional numerical test-cases were carried out. The tests showed that standard numerical schemes, which appear to be symmetry preserving under most flow configurations, produce nonsymmetric perturbations when large separated regions are present. These perturbations are amplified when the core flow is under compression. If the flow-blockage due to separation is sufficiently large, the symmetry of the flow may collapse altogether. Experimental evidence of this numerical behavior is also considered.
    Keywords: Fluid Mechanics and Thermodynamics
    Type: AIAA Paper 2001-0084 , Aerospace Sciences; Jan 08, 2001 - Jan 11, 2001; Reno, NV; United States
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  • 4
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    ISS Internal Active Thermal Control System (IATCS) Coolant Remediation Project (2005)
    In:  CASI
    Details
    Publication Date: 2019-08-15
    Description: The IATCS coolant has experienced a number of anomalies in the time since the US Lab was first activated on Flight 5A in February 2001. These have included: 1) a decrease in coolant pH, 2) increases in inorganic carbon, 3) a reduction in phosphate buffer concentration, 4) an increase in dissolved nickel and precipitation of nickel salts, and 5) increases in microbial concentration. These anomalies represent some risk to the system, have been implicated in some hardware failures and are suspect in others. The ISS program has conducted extensive investigations of the causes and effects of these anomalies and has developed a comprehensive program to remediate the coolant chemistry of the on-orbit system as well as provide a robust and compatible coolant solution for the hardware yet to be delivered. The remediation steps include changes in the coolant chemistry specification, development of a suite of new antimicrobial additives, and development of devices for the removal of nickel and phosphate ions from the coolant. This paper presents an overview of the anomalies, their known and suspected system effects, their causes, and the actions being taken to remediate the coolant.
    Keywords: Fluid Mechanics and Thermodynamics
    Type: SAE-051CES-279 , 2005 International Conference on Environmental Systems (ICES) 35th Annual Meeting; Jul 11, 2005 - Jul 14, 2005; Rome; Italy
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  • 5
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    Source Listings for Computer Code SPIRALI Incompressible, Turbulent Spiral Grooved Cylindrical and Face Seals (2005)
    In:  CASI
    Details
    Publication Date: 2019-08-15
    Description: This is the source listing of the computer code SPIRALI which predicts the performance characteristics of incompressible cylindrical and face seals with or without the inclusion of spiral grooves. Performance characteristics include load capacity (for face seals), leakage flow, power requirements and dynamic characteristics in the form of stiffness, damping and apparent mass coefficients in 4 degrees of freedom for cylindrical seals and 3 degrees of freedom for face seals. These performance characteristics are computed as functions of seal and groove geometry, load or film thickness, running and disturbance speeds, fluid viscosity, and boundary pressures.
    Keywords: Fluid Mechanics and Thermodynamics
    Type: NASA/CR-2003-212360 , MTI 95TM6 , E-13616
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  • 6
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    Glenn-HT: The NASA Glenn Research Center General Multi-Block Navier-Stokes Heat Transfer Code (2001)
    In:  CASI
    Details
    Publication Date: 2019-08-13
    Description: For the last several years, Glenn-HT, a three-dimensional (3D) Computational Fluid Dynamics (CFD) computer code for the analysis of gas turbine flow and convective heat transfer has been evolving at the NASA Glenn Research Center. The code is unique in the ability to give a highly detailed representation of the flow field very close to solid surfaces in order to get accurate representation of fluid heat transfer and viscous shear stresses. The code has been validated and used extensively for both internal cooling passage flow and for hot gas path flows, including detailed film cooling calculations and complex tip clearance gap flow and heat transfer. In its current form, this code has a multiblock grid capability and has been validated for a number of turbine configurations. The code has been developed and used primarily as a research tool, but it can be useful for detailed design analysis. In this paper, the code is described and examples of its validation and use for complex flow calculations are presented, emphasizing the applicability to turbomachinery for space launch vehicle propulsion systems.
    Keywords: Fluid Mechanics and Thermodynamics
    Type: JANNAF CS/APS/PSHS/MSS Joint Meeting; Apr 08, 2002 - Apr 12, 2002; Destin, FL; United States
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  • 7
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    Fluid Bubble Eliminator (2005)
    In:  CASI
    Details
    Publication Date: 2019-08-13
    Description: A gas-liquid separator uses a helical passageway to impart a spiral motion to a fluid passing therethrough. The centrifugal fore generated by the spiraling motion urges the liquid component of the fluid radially outward which forces the gas component radially inward. The gas component is then filtered through a gas-permeable, liquid-impervious membrane and discharged through a central passageway.
    Keywords: Fluid Mechanics and Thermodynamics
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  • 8
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    CFD Modeling Needs and What Makes a Good Supersonic Combustion Validation Experiment (2005)
    In:  CASI
    Details
    Publication Date: 2019-08-13
    Description: If a CFD code/model developer is asked what experimental data he wants to validate his code or numerical model, his answer will be: "Everything, everywhere, at all times." Since this is not possible, practical, or even reasonable, the developer must understand what can be measured within the limits imposed by the test article, the test location, the test environment and the available diagnostic equipment. At the same time, it is important for the expermentalist/diagnostician to understand what the CFD developer needs (as opposed to wants) in order to conduct a useful CFD validation experiment. If these needs are not known, it is possible to neglect easily measured quantities at locations needed by the developer, rendering the data set useless for validation purposes. It is also important for the experimentalist/diagnostician to understand what the developer is trying to validate so that the experiment can be designed to isolate (as much as possible) the effects of a particular physical phenomena that is associated with the model to be validated. The probability of a successful validation experiment can be greatly increased if the two groups work together, each understanding the needs and limitations of the other.
    Keywords: Fluid Mechanics and Thermodynamics
    Type: JANNAF 40th Combustion/28th Airbreathing Propulsion/22nd Propulsion Systems Hazards/4th Modeling and Simulation Joint Subcommittee Meeting; Jun 13, 2005 - Jun 17, 2005; Charleston, SC; United States
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  • 9
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    Electro-Active Device Using Radial Electric Field Piezo-Diaphragm for Control of Fluid Movement (2005)
    In:  CASI
    Details
    Publication Date: 2019-08-13
    Description: A fluid-control electro-active device includes a piezo-diaphragm made from a ferroelectric material sandwiched by first and second electrode patterns configured to introduce an electric field into the ferroelectric material when voltage is applied thereto. The electric field originates at a region of the ferroelectric material between the first and second electrode patterns, and extends radially outward from this region of the ferroelectric material and substantially parallel to the plane of the ferroelectric material. The piezo-diaphragm deflects symmetrically about this region in a direction substantially perpendicular to the electric field. An annular region coupled to and extending radially outward from the piezo-diaphragm perimetrically borders the piezo-diaphragm, A housing is connected to the region and at least one fluid flow path with piezo-diaphragm disposed therein.
    Keywords: Fluid Mechanics and Thermodynamics
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  • 10
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    Wind-US Unstructured Flow Solutions for a Transonic Diffuser (2005)
    In:  CASI
    Details
    Publication Date: 2019-08-13
    Description: The Wind-US Computational Fluid Dynamics flow solver computed flow solutions for a transonic diffusing duct. The calculations used an unstructured (hexahedral) grid. The Spalart-Allmaras turbulence model was used. Static pressures along the upper and lower wall agreed well with experiment, as did velocity profiles. The effect of the smoothing input parameters on convergence and solution accuracy was investigated. The meaning and proper use of these parameters are discussed for the benefit of Wind-US users. Finally, the unstructured solver is compared to the structured solver in terms of run times and solution accuracy.
    Keywords: Fluid Mechanics and Thermodynamics
    Type: NASA/CR-2005-213417 , AIAA Paper 2005-1004 , E-14939 , AIAA 43rd Aerospace Sciences Meeting and Exhibit; Jan 10, 2005 - Jan 13, 2005; Reno, NV; United States
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