In this study, thermo-fluid characteristics of elliptical annular finned tube heat exchanger were numerically studied in detail. Transition SST model was utilized to simulate turbulent flow. Effects of air velocities, horizontal to vertical fin diameter ratios, and fin densities were examined in detail. The simulations indicate superior performance of elliptical fin layout. It was shown that pressure drop of annular elliptical fin can be only one half of that of a circular annular fin while containing comparable heat transfer performance. The vertical elliptical annular fin may even contain a higher heat transfer performance over circular fin. Correlations are proposed to estimate the Nu number and pressure drop based on the annular circular fin. The maximum deviations between the proposed correlations and simulations regarding pressure drop and heat transfer coefficient are 5.6% and 3.2%, respectively. For further elaboration of the superiority of the elliptical layout from the second law perspective, normalized entropy generation was also studied. In all cases, the entropy generation rate in circular fin was higher than that of an elliptical fin.

在这项研究中，对椭圆环形翅片管换热器的热流体特性进行了详细的数值研究。利用过渡SST模型来模拟湍流。详细检查了空气流速，水平与垂直翅片直径比以及翅片密度的影响。仿真表明椭圆形鳍片布局具有优越的性能。结果表明，环形椭圆形翅片的压降仅为圆形环形翅片的压降的一半，同时具有相当的传热性能。垂直的椭圆形环形翅片甚至可以具有比圆形翅片更高的传热性能。提出相关性以估计Nu数量和压降基于环形圆形散热片。所建议的相关性和模拟之间关于压降和传热系数的最大偏差分别为5.6％和3.2％。为了从第二定律的角度进一步阐述椭圆布局的优越性，还研究了归一化熵的产生。在所有情况下，圆形鳍片的熵产生率均高于椭圆形鳍片。