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  • 1
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    Simplified thermodynamic functions for vapor-liquid phase separation and fountain effect pumps (1984)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: He-4 fluid handling devices near 2 K require novel components for non-Newtonian fluid transport in He II. Related sizing of devices has to be based on appropriate thermophysical property functions. The present paper presents simplified equilibrium state functions for porous media components which serve as vapor-liquid phase separators and fountain effect pumps.
    Keywords: THERMODYNAMICS AND STATISTICAL PHYSICS
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  • 2
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    Slip effects associated with Knudsen transport phenomena in porous media (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-04-02
    Description: Porous media used in phase separators and thermomechanical pumps have been the subject of characterization efforts based on the Darcy permeability of laminar continuum flow. The latter is not always observed at low speed, in particular at permeabilities below 10 to the -9th/squared cm. The present experimental and theoretical studies address questions of slip effects associated with long mean free paths of gas flow at room temperature. Data obtained are in good agreement, within data uncertainty, with a simplified asymptotic Knudsen equation proposed for porous plugs on the basis of Knudsen's classical flow equation for long mean free paths.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: Cryogenics (ISSN 0011-2275); 28; 110-114
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  • 3
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    Separator plugs for liquid helium (1984)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Work performed during Summer 1984 (from June to Sept. 30) in the area of porous media for use in low temperature applications is discussed. Recent applications are in the area of vapor - liquid phase separation, pumping based on the fountain effect and related subsystems. Areas of potential applications of the latter are outlined in supplementary work. Experimental data have been developed. The linear equations of the two-fluid model are inspected critically in the light of forced convection evidence reported recently. It is emphasized that the Darcy permeability is a unique throughput quantity in the porous media application areas whose use will permit meaningful comparisons of data not only in one lab but also within a group of labs doing porous plug studies.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA-CR-176545 , NAS 1.26:176545 , UCLA-ENG-8436
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  • 4
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    Thermal components for 1.8 K space cryogenics (1986)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Work of the summer 1986 is summarized in three areas. First, conceptual design of a laboratory system for heat exchanger evaluation in conjunction with the operation of a thermally activated fountain effect pump (FEP) is presented. Second, Knudsen effect evaluation of fine porous media useful for the pressurization plug which forms the main component of the FEP is described. Third, proof-of-principle test of the lab system selected on the basis of the evaluation is summarized.
    Keywords: ENGINEERING (GENERAL)
    Type: NASA-CR-180205 , NAS 1.26:180205 , UCLA-ENG-8640
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  • 5
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    Dynamics insulation systems (1985)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Advanced dynamic insulation systems were analyzed from a thermodynamic point of view. A particular performance measure is proposed in order to characterize various insulations in a unique manner. This measure is related to a base quantity, the refrigeration power ratio. The latter is the minimum refrigeration power, for a particular dynamic insulation limit, to the actual reliquefaction power associated with cryoliquid boiloff. This ratio serves as reference quantity which is approximately constant for a specific ductless insulation at a chosen normal boiling point. Each real container with support structure, vent tube, and other transverse components requires a larger refrigeration power. The ratio of the actual experimental power to the theoretical value of the support-less system is a suitable measure of the entire insulation performance as far as parasitic heat leakage is concerned. The present characterization is illustrated using simple thermodynamic system examples including experiments with liquid nitrogen. Numerical values are presented and a comparison with liquid helium is given.
    Keywords: THERMODYNAMICS AND STATISTICAL PHYSICS
    Type: NASA-CR-177026 , NAS 1.26:177026 , UCLA-ENG-8532
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  • 6
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    Vapor-liquid phase separator studies (1983)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Porous plugs serve as both entropy rejection devices and phase separation components separating the vapor phase on the downstream side from liquid Helium 2 upstream. The liquid upstream is the cryo-reservoir fluid needed for equipment cooling by means of Helium 2, i.e Helium-4 below its lambda temperature in near-saturated states. The topics outlined are characteristic lengths, transport equations and plug results.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-CR-166545 , NAS 1.26:166545 , UCLA-ENG-83-49
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  • 7
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    Determination of the Darcy permeability of porous media including sintered metal plugs (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Sintered-metal porous plugs with a normal size of the order of 1-10 microns are used to evaluate the Darcy permeability of laminar flow at very small velocities in laminar fluids. Porous media experiment results and data adduced from the literature are noted to support the Darcy law analog for normal fluid convection in the laminar regime. Low temperature results suggest the importance of collecting room temperature data prior to runs at liquid He(4) temperatures. The characteristic length diagram gives a useful picture of the tolerance range encountered with a particular class of porous media.
    Keywords: ENGINEERING (GENERAL)
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  • 8
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    Vapor-liquid phase separator studies (1985)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: A study of porous plug use for vapor-liquid phase seperation in spaceborne cryogenic systems was conducted. The three main topics addressed were: (1) the usefulness of porous media in designs that call for variable areas and flow rates; (2) the possibility of prediction of main parameters of porous plugs for a given material; and (3) prediction of all parameters of the plug, including secondary parameters.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-CR-166545 , T-6624 , NAS 1.26:166545
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