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  • Weitere Quellen  (5)
  • FLUID MECHANICS AND HEAT TRANSFER  (4)
  • Engineering (General)  (1)
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  • 1
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    Channel size influence on the heat flux density at zero net mass flow in the non-linear transport regime between 1.2 and 2.1 K (1987)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-06-28
    Beschreibung: Porous media and narrow ducts of simple shape at zero net mass flow (ZNMF) are used to investigate the influence of pore size on the entropy/heat convection rate at ZNMF. The study is relevant to the development of specific types of phase separators. Previous work on heat transport by convection is extended to porous media without mass loss. The experimental results show the influence of pore size on heat flux for permeabilities between 10 to the -8th and 10 to the -6th sq cm. ZNMF plug data are found to be similar to results obtained for vapor liquid phase separation.
    Schlagwort(e): FLUID MECHANICS AND HEAT TRANSFER
    Format: text
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  • 2
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    Superfluid helium 2 liquid-vapor phase separation: Technology assessment (1984)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-28
    Beschreibung: A literature survey of helium 2 liquid vapor phase separation is presented. Currently, two types of He 2 phase separators are being investigated: porous, sintered metal plugs and the active phase separator. The permeability K(P) shows consistency in porous plug geometric characterization. Both the heat and mass fluxes increase with K(P). Downstream pressure regulation to adjust for varying heat loads and both temperatures is possible. For large dynamic heat loads, the active phase separator shows a maximum heat rejection rate of up to 2 W and bath temperature stability of 0.1 mK. Porous plug phase separation performance should be investigated for application to SIRTF and, in particular, that plugs of from 10 to the minus ninth square centimeters to 10 to the minus eighth square centimeters in conjunction with downstream pressure regulation be studied.
    Schlagwort(e): FLUID MECHANICS AND HEAT TRANSFER
    Materialart: NASA-TM-85966 , A-9768 , NAS 1.15:85966
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Vapor-liquid phase separator studies (1983)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-28
    Beschreibung: 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.
    Schlagwort(e): FLUID MECHANICS AND HEAT TRANSFER
    Materialart: NASA-CR-166545 , NAS 1.26:166545 , UCLA-ENG-83-49
    Format: application/pdf
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  • 4
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    Vapors-liquid phase separator (1980)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: The use of porous plugs, mostly with in the form of passive devices with constant area were considered as vapor-liquid phase separators for helium 2 storage vessels under reduced gravity. The incorporation of components with variable cross sectional area as a method of flow rate modification was also investigated. A particular device which uses a shutter-type system for area variation was designed and constructed. This system successfully permitted flor rate changes of up to plus or minus 60% from its mean value.
    Schlagwort(e): FLUID MECHANICS AND HEAT TRANSFER
    Materialart: NASA-CR-163621 , UCLA-ENG-8073
    Format: application/pdf
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  • 5
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    Steady Secondary Momentum and Enthalpy Streaming in the Pulse Tube Refrigerator (1994)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-07-17
    Beschreibung: Our study investigates the steady secondary streaming that occurs in the pulse tube refrigerator through application of the conservation laws and support by flow visualization experiments. A series expansion of the mass, momentum and energy conservation laws for an axisymmetric system yields a set of linear differential equations. The series solution is expanded in the small parameter epsilon = 1/Str where Str is the Strouhal number. The O(1) basic flow problem is solved for the case of a compressible ideal gas oscillating within a cylindrical tube. The phase and amplitude of the boundary conditions on axial velocity are treated as independent parameters. The basic solution for the gas domain is solved for the case of temperature and heat flux coupling to the tube wall. The temperature coupled solution shows how the Fourier number of the tube wall affects the gas temperature, phase angle, and time-averaged enthalpy flow. The basic solution is also examined for the time-averaged Reynolds stresses which are shown to be the driving force that produces steady secondary momentum streaming. Calculated solutions to the steady momentum streaming are shown to be in qualitative agreement with flow visualization experiments.
    Schlagwort(e): Engineering (General)
    Materialart: International Cryocooler Conference; Jun 28, 1994 - Jun 30, 1994; Vail, CO; United States
    Format: text
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