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HEAT AND MASS TRANSFER IN POROUS MEDIA PHASE SEPARATION AT TEMPERATURES BELOW THE λ-POINT OF He4

S. W. K. Yuan
University of California, Los Angeles 90024 CA USA

Traugott H. K. Frederking
University of California, Los Angeles, California 90024, USA

Abstract

Newtonian fluid motion, coupled to heat transfer via latent heat of phase transition, is well known from numerous studies of condensation and boiling. Considerably less knowledge is available for vapor-liquid phase separation in the absence of gravity effect on the transport phenomena. The present studies are focussed on heat and mass transfer associated with vapor-liquid phase separation required for long-term storage of the cryogen liquid He II in space vessels. Though space conditions are the dominant mode of interest in advanced equipment, e. g. IR telescopes, the systems may be operated in principle during terrestrial conditions. The latter are considered in the present work. It emphasizes the linear regime in -cluding an extrapolation based on variable thermo-physical properties. Data taken with a phase separation apparatus show departures from the linear regime prediction. They agree with a transport equation proposed for the non-linear, turbulent regime.

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