About Pool Boiling CHF in Different Wettability Liquids

概要

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This study deals with critical heat flux that occurs in boiling heat transfer while transient heat input as itincreased in a exponential function with time in a pool of water and well wetting liquid, ethanol. Theboiling heat transfer characteristics and CHFs were measured using a 1.0 mm diameter horizontalcylinder for wide range of pressures and subcoolings, with the photographic observations on the vaporbubble behavior by using a high-speed video camera. It was confirmed that CHFs changedsystematically depending on experimental conditions. The quasi-steady-state CHFs measured weredivided into two mechanisms for lower and higher subcooling resulting from HI or HSN. Thedependency of HSN in the high subcooling was found remarkably in wetting liquid. Typical trends ofthe transient CHFs were clarified to three groups corresponding to time constant, periods; the first,second and third groups of CHF were for longer periods, for shorter and for intermediate ones.
大島商船高等専門学校の論文
2007-12-01