Abstract
Numerical solutions of the developing temperature field were obtained for fully developed laminar, incompressible flow in an internally finned tube of finite thermal conductivity. The momentum and energy equations were solved using an alternating direction implicit (ADI) algorithm. First, the laminar flow field was computed for a given fin configuration, and then the temperature fields in the fluid and the solid were solved simultaneously. Two different boundary conditions were considered: fixed temperature, and constant heat flux on the outer tube rim. The solutions were obtained under the condition of constant flow rate, regardless of fin configuration. This feature enabled us to make comparisons among the various cases. The numerical results show that the height and thickness of the fins, thickness of the tube wall, and ratio of the solid to fluid thermal conductivity have pronounced effects on the solution. It is also shown that the assumption of infinite thermal conductivity of the fin is not justifi...
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