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Space Cryogenics Components Based on the Thermomechanical Effect: I. Vapor-Liquid Phase Separators
Research and Development Division
Lockheed Martin Missiles and Space Co.
Palo Alto, CA 94304, U.S.A.
University of California, Los Angeles
Los Angeles, CA 90024, U.S.A.
A survey of He II vapor-liquid phase separation is given emphasizing fluid-related transport phenomenon. In this Part 1, flow phenomena are addressed based on the findings of the Ph.D. thesis of the first author. The historical development in the phase separation area has promoted systems in which the solid state component acts as an insulated body. It is noted that the "Fairbank Plug" limit constitutes another type of phase separation mode useful for very low heat rejection rates.
In fluid transport-controlled vapor liquid phase separation (VLPS) the two-fluid model is a most convenient tool for qualification of plug parameters. The 'bottleneck mechanism' has been found to be the heat transported through the porous plug in the form of normal fluid convection. Two main regions support stable VLPS: 1. The low speed regime of laminar (linear) flow, and 2. Non-linear convection at relatively high speed. Major findings are presented relying on the phenomenological theory for liquid He II and emphasizing the normal fluid component of the two-component system (superfluid and normal fluid) of He II. Download this Paper
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About the author- Dr. Sidney Yuan is a consultant in the field of Low Temperature Physics and Cryogenics, and has written a Book on Cryogenics and published extensively in the field. E-Mail.
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