Abstract
This paper is an extension of a previous one [1] in which heat transfer has been analyzed by the wave theory for natural convection and for nucleate boiling in detail and for film boiling in principle. In the present paper, heat transfer in saturated and subcooled film boiling from horizontal and vertical surfaces is analyzed from the viewpoint of the previously presented idea. By means of the concept of equivalent thermal diffusivity a generalized Prandtl number is recommended. Thus a general formula is obtained for both convection and boiling. The predicted results agree well with the experiments of previous investigators.
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