An application of the heat transfer enhancement effect of the self-induced vibration of superfluid helium to the space observation enquipment

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The main result of this research would be arranged as follows1) In the strongly subcooled state of the He II, the vapor layer was very thin and the behavior of the vapor layer was relatively stable. As pressure of the He II bath was decreased, the behavior of the vapor layer was intensified gradually and the relatively stable area was diminished. And in the weakly subcooled state of the He II, the thickness of the vapor layer was increased as the decrease of the pressure of the bath. In the case of the pressure adjacent to λ-pressure, it was confirmed that the boiling state changed from stable boiling to unstable boiling. This boundary was confirmed in the pressure higher than 1-pressure.2) The subcooled and the silent film boiling in the He II are the same boiling mode and these film boiling modes are identical to the normal film boiling that occurs in common fluids. And the noisy film boiling in the He II is a kind of large-scale unstable phenomenon that generates the large oscillation in the heater temperature and the heat transfer coefficient, and it is the characteristic boiling mode in He II3) The boundary between the weakly subcooled and the noisy film boilings in He II exists just above λ-pressure. This boundary increases as the He II temperature decreases or the heat flux increases.