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

实验研究了饱和超流氦（He II）中膜沸腾的传热特性和蒸汽层行为。He II已被用作超导磁体和空间观测仪器冷却的优良冷却剂。本文采用不锈钢薄膜加热器测量了膜沸腾过程中的传热系数，并利用高速摄像机观察了膜沸腾过程中的蒸汽层行为。研究了He II中膜沸腾的水动力稳定性。证实了饱和膜沸腾过程中的传热与湍流He II的导热函数有关。结果表明，随着汽相层平均厚度的减小和汽相层行为频率的增加，换热作用增强。

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.