Various Film Boiling States in He II at Hydrostatic Pressures from Saturated Vapor Pressure to 1 ATM
The characteristic feature of several film boiling states in He II is experimentally investigated by measuring pressure oscillation in a wide range of hydrostatic pressure from saturated vapor pressure to above the lambda pressure. There appear two kinds of film boiling states in He II under nearly saturated vapor pressure condition depending on the magnitude of the hydrostatic pressure. Above the lambda pressure, however, a film boiling state being different from noisy state appears in which much weaker but higher frequency audible noise is generated. The transition from one boiling state to another is clearly seen from the shift in the predominant frequency of pressure oscillation. It is found that noisy boiling does not occur in subcooled He II.
KeywordsHydrostatic Pressure Saturated Vapor Pressure High Hydrostatic Pressure Pressure Oscillation Superfluid Helium
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