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THERMO-OSMOTIC CONVECTION OF CRYO-FLUID HE II AT INCIPIENT LAMBDA TRANSITION ABOVE THE CRITICAL PRESSURE

J. Y. Lee
School of Engineering and Applied Science University of California, Los Angeles

S. Caspi
School of Engineering and Applied Science University of California, Los Angeles

S. C. Soloski
School of Engineering and Applied Science University of California, Los Angeles

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

Abstract

Thermo-osmotic convection in He II has been studied above the thermodynamic critical pressure of He4 in order to resolve theoretical and experimental properties common to all liquids. The emphasis is on the heat flux regime at the incipient lambda transition from He II to He I. Inter-facial instability is analyzed to predict breakup and related heat fluxes in conjunction with the Gorter-Casimir-Borelius model (GCB). Data taken with a pressure apparatus support the assumption of a well-defined phase transition. Limiting heat fluxes qλ are in partial agreement with prediction according to which qλ is a monotonically decreasing function of the He II bulk temperature. The data indicate that the ratio of the characteristic breakup length to the coherence distance of GCB is significantly larger than unity.

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