In this study, the natural convection heat transfer phenomena from vertical cylinders with branched pin fins are experimentally investigated. Experiments are conducted to measure the heat transfer rates from finned cylinders to the surrounding air at various cylinder wall temperatures, fin pitch angles, and fin heights. The experimental results indicate that the thermal resistance of vertical cylinders with branched pin fins is 20% smaller than that of conventional vertical cylinders with plate fins. The thermal resistance per unit fin volume of the former is 40% smaller than that of conventional finned cylinders. Moreover, a correlation for the Nusselt number is obtained from the calculated thermal resistance values. The error between the predictions from the correlation and experimental results is less than 20%. In addition, the effects of fin length and fin pitch angle on the thermal resistance are investigated using the proposed correlation.

在这项研究中，通过实验研究了具有分支销翅片的垂直圆柱体的自然对流换热现象。进行实验以测量在各种气缸壁温度、翅片间距角和翅片高度下从翅片气缸到周围空气的传热率。实验结果表明，带分支销翅片的立式圆柱体的热阻比传统的带板翅的立式圆柱体的热阻小20%。前者单位翅片体积的热阻比传统翅片气缸小40%。此外，从计算出的热阻值中获得了努塞尔数的相关性。相关性预测与实验结果之间的误差小于 20%。此外，