Abstract
Quasi-steady nucleate boiling with a certain life on a horizontal cylinder in liquid He I caused by a large stepwise heat input, whose height was far beyond the value corresponding to the steady critical heat flux was investigated for a wide range of system pressure, and for various liquid subcoolings at atmospheric pressure. It was confirmed that the quasi-steady nucleate boiling exists with a certain life at the state corresponding to the point on the extension of the steady nucleate boiling curve for each system pressure. The life for a nucleate boiling heat flux for saturated He I becomes maximum at pressure of around 70 kPa where the steady critical heat flux also has a maximum value for the system pressure and it becomes large with the increase of liquid subcooling. Effect of heater diameter on the quasi-steady nucleate boiling and its life was also investigated. A correlation to express the life for the step heat input was given as a function of the quasi-steady nucleate boiling heat flux for a wide range of the system pressure.
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