Abstract
The heat transfer in the boundary layer region of a circular free jet impinging on a flat solid surface with non-uniform wall temperature or wall heat flux is investigated analytically. The flow is laminar, incompressible and steady. The analysis begins with obtaining the solution to the problem with a step change in wall temperature or wall heat flux. The solution to the corresponding problem with arbitrary wall temperature or wall heat flux is obtained by superposition. This solution is then matched with that for the stagnation region obtained in the first part of this study so that the Nusselt number throughout the stagnation region and the boundary layer region is obtained. The results indicate that the Nusselt number for increasing wall temperature or wall heat flux can be considerably higher than that for constant wall temperature or wall heat flux outside the stagnation region. For the special case of constant wall temperature, the result is in good agreement with the integral solution ofChaudhury.
Published Version
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