Abstract
The characteristics of transient heat transfer on horizontal cylinders in He I and He II caused by various large stepwise heat inputs are described for wide ranges of system pressure and liquid heat. Characteristics such as the quasi-steady nucleate boiling with a lifetime for He I, and the quasi-steady Kapitza conductance with a lifetime for He II for ideal step inputs, are compared. Steady-state critical heat flux for He II increases with increased subcooling and becomes much higher than that for He I. In steady-state heat transfer for highly subcooled He II, the surface temperature jump at the critical heat flux is negligibly small. He II has good stability characteristics for large local thermal disturbances, and these become significantly better with increased subcooling.
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