Abstract
Propagation of a thermal shock wave and of highly transient heat transport phenomena in He II are experimentally investigated with a superconducting temperature sensor. The variation of the wave height of a thermal shock wave during propagation is compared with the prediction of a energy conservation and the Burgers equation. The total amount of energy carried away by a thermal wave from a heating surface is evaluated from the area of the measured wave profile and its variation is investigated with varying heat flux and heating time. It is found that just a small amount of energy is transported through He II in the form of a second sound wave for the case of large heat flux and long heating time. The rest of the applied energy from the heater is diffusively transported since dense tangled vortices impede ideal heat transport in the second sound mode.
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