Abstract
The heat transfer by free convection in viscous oil is practically important for the design on the tank heaters of an oil tanker etc. The free convective phenomenon in oil is different from that in other fluids with constant properties, since oil has viscosity which depends sensively on temperature. However, few studies have been given to these kinds of problem. This paper deals with the theoretical analysis of the free convection in oil. The numerical solutions of the basic equations are given to a horizontal tube and a vertical plate in wide range of Prandtl numbers and wall temperature on a digital computer. And the effect of variable viscosity is discussed. Finally, the formulas for Nusselt number are presented for the case of the heat transfer in oil.
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