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DESTRUCTION OF SUPERFLUIDITY CAUSED BY HEAT TRANSPORT FROM A HOT WALL THROUGH A WIDE TUBE TO A BATH OF LIQUID HELIUM II

B. W. Clement
University of California Los Angeles, California

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

Abstract

Heat transport through a vacuum-insulated short tube of large diameter (0.4 in.) to bulk liquid He II (1.75°K to the λ-point) has been studied when superfluidity is destroyed locally by film boiling. Heat was applied at constant power through a horizontal surface terminating the tube at its lower end. The heat transfer coefficients (0.014 to 0. 027 W/cmK) were a function of the length (about 0 to 10 in.) of the bulk liquid heat path. They increased upon lowering of the liquid temperature in approximate agreement with expectation based upon the apparent thermal conductivity of He II.

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