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BOILING HEAT TRANSFER FOR A PLANE WATER JET IMPINGING ON A HOT SURFACE

Seikan Ishigai
Department of Mechanical Engineering, Faculty of Engineering, Osaka University, Yamada-kami, Suita, 565, Japan

Shigeyasu Nakanishi
Department of Mechanical Engineering, Faculty of Engineering, Osaka University, Yamada-kami, Suita, 565, Japan; Department of Chemical Engineering, Faculty of Engineering, Himeji Institute of Technology, 2167 Shosha, Himeji, Hyogo 671-22, JAPAN

Toshiaki Ochi
Faculty of Engineering, Osaka University, Osaka, Japan

Abstract

Heat flux to a plane water jet impinging on a high temperature flat surface is measured at its stagnation point by a transient method. In the film and nucleate boiling regions, experiments are also made by a steady-state method. The results obtained by the two methods substantially agree. In the film boiling region, no liquid-solid contact is found. At the lower limit of the film boiling, incipience of liquid-solid contact is detected. The boiling curve obtained is not always monotonous from the minimum heat flux to the maximum, but has a 'shoulder' of nearly constant heat flux within a certain wall temperature range at some conditions. An analytical solution to the film boiling of an impinging liquid jet is performed by applying the two-phase boundary layer theory.

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