Abstract A numerical simulation of natural convection heat transfer from annular elliptical finned tubes was conducted. A parametric study was also carried out to explain the effect of fin shape change from circular to elliptical on the flow field and heat transfer. It was shown that there was an optimum value for the fin aspect ratio (ratio of main diameters) in which heat flux was maximised. Finally, a correlation was proposed to calculate the Nu number for the elliptical fin. This correlation approached the circular fin correlation for the case of equal main diameters. Finally, the optimum aspect ratio was presented graphically.

中文翻译：

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水平环形椭圆翅片管上的自然对流换热

摘要 对环形椭圆翅片管的自然对流换热进行了数值模拟。还进行了参数研究以解释翅片形状从圆形变为椭圆形对流场和传热的影响。结果表明，翅片纵横比（主直径比）存在一个最佳值，其中热通量最大。最后，提出了一种相关性来计算椭圆鳍的 Nu 数。对于主直径相等的情况，这种相关性接近于圆形翅片相关性。最后，以图形方式呈现最佳纵横比。