Micro thermo-fluid mechanism generated near the interface in superfluid liquid helium

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The heat transfer characteristics and the vapor layer behavior of the film boiling in the saturated superfluid helium (He II) were experimentally investigated. He II has been utilized as an excellent coolant for cooling of the superconducting magnet and the space observation instrument. In the present study, the heat transfer coefficient during film boiling was measured by use of the stainless thin film heater and the vapor layer behavior was observed by use of the high speed video camera. The hydrodynamic stability of the film boiling in He II was examined. It is confirmed that the heat transfer during the saturated film boiling correlates with the heat conductivity function for turbulent He II. It is found that the heat transfer is enhanced as the mean vapor layer thickness decreases and the frequency of the vapor layer behavior increases.