Abstract
Numerical computation of flow and thermal fields has been carried out for a two-dimensional model of an offset-fin array in the low Reynolds number range, in which flow remains steady and laminar. The effect of fin thickness, t, has been studied changing the fin pitch, S, fin offset length, L, fin total depth, H, and Reynolds number Re. Increase of fin thickness leads to some increase of heat transfer coefficient and a much more noticeable increase of pressure loss. Such effects become more pronounced when the fin total depth is increased and when the fin offset length is decreased. The effects also become more noticeable at a smaller Reynolds number and at a smaller S/L ratio. These effects result from the acceleration of the flow and the meandering of the flow in the space between neighboring fins. The effect of the latter was thoroughly analyzed and was found to appear as the combination of three different basic effects.
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