Effect of Elliptical Tube Geometry on Heat Transfer Performance in a Rectangular Channel

Résumé

This study investigates numerically the effect of the Aspect Ratio (AR) of elliptical obstacles on the heat transfer and thermodynamic irreversibility in a heat exchanger. The results show that the average Nusselt number increased with Reynolds number for all the considered cases. At high Reynolds number values, increasing AR enhances heat transfer around the first obstacle, which reduces the heat transfer potential of the downstream obstacles. Moreover, a larger aspect ratio reduces flow recirculation and increases temperature gradients near the obstacle surface, leading to better heat transfer. For Reynolds number equal to 100, increasing AR leads to an 11% increase in the total Nusselt number and a 21% decrease in total entropy generation. Overall, increasing AR improves heat transfer while reducing thermodynamic irreversibility, making elliptical obstacles a promising option for heat exchanger design.

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