Studies of Surface Heat Transmission by Natural Convection on Flat Plate (4th Report) : Effects of Forced Convection on Turbulent Natural Convection

This paper deals with the effects of a forced convection on the heat transfer by turbulent natural convection, when both convections occur in the same direction on a vertical flat plate, and the relations among Nusselt's, Grashoff's and Reynolds' number are theoretically analyzed. As the result of this study, we found that, in some cases, the coefficient of heat transfer by combined natural and forced convections is several times as large as that by the natural convection or the forced convection alone, and the natural convection can not be neglected when the velocity of forced convection is comparatively small and the temperature differences between the plate and the fluid is large.