The heating of oil tanks in order to maintain the contents in a fluid condition is nesessary in most tankers. However, lack of the knowledge of heating characteristics associated with high-viscosity of oil has made it difficult to design reasonable heating systems. This paper dcals with the heat transfer problems on these heating systems. The heat transfer coefficients of the coils and the tank-walls are obtained theoretically, and a good agreement between the theory and the experiment is shown. Thermal convective characteristics in a model tank are also studied.
