The heat transfer between eccentric rotating cylinders is studied using a modified bipolar coordinate system. The energy equation has been solved by expressing the temperature in the form of a perturbation in terms of α, the dimensionless parameter defining the clearance ratio; and Rm, the modified Reynolds number. The effect of Prandtl number, eccentricity and velocity ratio on temperature distribution has been shown graphically. The results are valid for small clearance ratio. There is no restriction on eccentricity.

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