MEASUREMENT OF CHARACTERISTIC TIME FOR QUANTIZED VORTEX TANGLE DEVELOPMENT IN HE-II

The characteristic time of quantized vortex tangle development due to pulsed heating in He II is measured from the thermal pulse shape defor mation with a superconductive temperature sensor. It is the time durat ion which is required for the effect of quantized vortex tangle on tra nsient heat transfer phenomena to become appreciable. The relationship between the characteristic time and the applied heat flux is obtained . Its temperature dependence and the comparison between the time and t he onset time of transient nucleate boiling are also discussed. (C) 19 97 Elsevier Science Ltd. All rights reserved.