Abstract

In an effort to clarify the mechanism of the inception of phase transition in liquid helium, HeII was made cavitate in the flow through a glass-constriction-nozzle with a diameter of 0.45 mm by using a fountain effect pump. Attainable critical velocities for incepient cavitation were obtained over a temperature range of 1.2 K to λ -point. It was found that the cavitation threshold observed was quite low, with an approximate range of 0.1 KPa ∼ -1 KPa.

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