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RESEARCH PAPERS

Influence of Forced Flow on the He II-He I Transition in the Presence of Heat Flow

[+] Author and Article Information
S. Caspi

Lawrence Berkeley Laboratory, University of California, Berkeley, Calif. 94720

T. H. K. Frederking

University of California, Los Angeles, Calif. 90024

J. Heat Transfer 105(4), 846-850 (Nov 01, 1983) (5 pages) doi:10.1115/1.3245672 History: Received September 29, 1981; Online October 20, 2009

Abstract

The influence of forced flow on the He I-He II, two-phase flow has been studied during heat transfer to superfluid He II in a U-shaped tube, at pressures from 2.4 bar to 10 bar, bath temperatures from 1.6 K to 2.1 K, and flow velocities from zero internally applied speed (“zero net mass flow”) to the order of 0.1 cm/s. Within this range of conditions, forced flow (i) did not influence heat transfer prior to phase transitions more than 10 percent; (ii) reduced temperature excursions at lambda phase transitions by a factor of 2 at most with respect to zero net mass flow; (iii) did not influence the limiting heat flux density at initiation of the lambda transition in the supercritical pressure range covered.

Copyright © 1983 by ASME
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