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Title: He II Liquid/Vapor Phase Separator for Large Dynamic Range Operation
Authors: Nakano, A.
Petrac, D.
Issue Date: 25-Jul-1995
Citation: Space Cryogenics Workshop 1995, Calverton, Maryland, July 25-26, 1995
Abstract: A phase separator, which separates helium vapor from liquid superfluid helium (He II), is an indispensable device for space cryogenics. The most recent approach to the Space Infrared Telescope Facility (SIRTF) uses a new design concept in which only the detector package is cold at launch, the remainder of the telescope being subsequently cooled to operating temperature on orbit. Therefore, a large dynamic operational range is required of the cryogen system. This is a report of initial laboratory test results with candidate porous plugs as phase separators. Mass flow rates and pressure and temperature differences across a porous plug were measured in this experiment. Relatively large mass flow rates were observed even at small pressure differences. In the high mass flow rate region, a hysteresis was observed with increases and decreases of the pressure difference. A linear theory is proposed and compared with experimental data to explain several phenomena observed in this system.
Appears in Collections:JPL TRS 1992+

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