Heat transfer from metallic filaments (whiskers) into helium under overcritical pressure for temperatures between 3.7 and 7.2 K

Abstract

The heat transfer coefficient α, near the critical temperature, T cO, was determined for several whiskers from the In-Pb alloy system. For this purpose the hysteresis of the voltage-temperature ( V- T B) transition curves at fixed currents, I, and of the V- I characteristics at fixed helium bath temperature, T B, was determined. The advantage of using measurements made with whiskers is that there is no heat transfer to a substrate and negligible heat transfer to the contracts. The only heat transfer is that to the surrounding helium.