Abstract
Three-dimensional incompressible laminar fluid flow and heat transfer of a heated array of circular perforated fins are examined numerically. The Navier–Stokes and energy equations are solved by a finite volume method using the SIMPLE algorithm. The second order upwind technique is employed to discretize the momentum and energy equations. Computations were performed for a range of Reynolds numbers 100 ≤Re ≤ 350. Thermal performance and effectiveness as well as friction coefficient of perforated and solid fins are determined for the optimum porosity. The results show that the average coefficient of friction reduces with increasing the Reynolds number and the number of perforations. The heat transfer rate increases with the porosity and the Reynolds number. It is found that perforated fin effectiveness decreases with the number of peroration at constant Reynolds numbers.
Highlights
Advanced technologies need high performance heat transfer equipment
It is known that the amount of average Nusselt number for circular perforated fins is higher than that of rectangular ones [10]
We showed that the percentage of weight reduction of perforated fins in comparison with the solid one depends on the number of perforations
Summary
Advanced technologies need high performance heat transfer equipment. Methods for improving heat transfer divided into two categories: active and passive methods [1]. Active methods require external power to enhance heat transfer and passive methods do not require external power. Extended surfaces or fins are example of passive methods that are commonly used in variety of industrial applications to enhance the rate of heat transfer between primary surface (heat sink) and ambient fluid. Optimization is considered in designing of heat exchangers in a way that prices reduce and better performance results. Fin optimization can be performed by minimizing the weight of the fin for specific amount of heat transfer or enhancing the heat transfer for specific weight of the fin. One of the best ways to improve the performance of heat transfer is to use fins with perforation [2]
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