Subcooled Pool Boiling CHFs on Cylinder due to Transient Heat Input

抄録

Detailed understanding of generalized saturated and subcooled pool boiling CHF (Critical Heat Flux) phenomena is very important for the design and the safety assessment such as those in high heat flux cooling systems using subcooled water pool boiling, in the super-conducting magnets cooled by liquid helium and liquid nitrogen, and in the thermal control of microelectronic assemblies for future super-computers cooled by Fluorinert liquid FC-72. The objective of this work is to clarify the effect of the pressures, subcoolings, and periods on pool boiling CHF, and is to elucidate the generalized phenomena at steady and transient CHF depending on the wettability of boiling liquids. The CHF data were considerably explained by a boiling liquid approach and its property. Photographic observations of the vapor bubble behavior during film boiling transitions were also performed using a high-speed video camera system.