Abstract The optimization of pore structure for metal foam is a feasible method for reducing the pressure drop and improving the overall heat transfer performance, especially at high velocity. In this regard, the optimized Kelvin cell with elliptical skeletons with a cross-section ratio of the long axis to the short axis (b/a) of 1.0, 1.4, and 2.0 are considered to evaluate the effects of b/a on the pressure drop and the heat transfer coefficient (HTC). The results indicate that both the pressure drop and HTC decrease with an increase in b/a. However, the pressure drop reduces more significantly. For instance, as b/a increases from 1.0 to 2.0, the pressure drop and the volumetric HTC at 90 m/s decrease by 98.5% and 6.3%, respectively. Therefore, the value of the volumetric area goodness factor (which considers both the effect of heat transfer coefficient and pressure drop on the overall heat transfer performance) j v / f of the sample with b/a = 2.0 is 86.7% higher than the sample with b/a = 1.0 at 90 m/s. As the velocity increases, the effect of b/a on the overall heat transfer performance increases. Compared with the cylindrical skeleton velocity distribution and pressure drop, the elliptical skeletons lead to a more uniform velocity distribution and reduce pressure drop significantly; nevertheless, the temperature distributions barely change. Moreover, the elliptical skeleton increases the specific surface area. Therefore, the j v / f of the elliptical skeleton significantly improves. This study provides a new direction for the design of novel metal foams with excellent overall heat transfer performance for heat transfer devices.

中文翻译：

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具有优化骨架的开尔文电池中强制对流传热的模拟

摘要 优化泡沫金属的孔隙结构是降低压降、提高整体传热性能，尤其是高速传热性能的一种可行方法。对此，考虑优化的长轴短轴截面比（b/a）为1.0、1.4和2.0的椭圆骨架开尔文电池来评估b/a对压力的影响降和传热系数 (HTC)。结果表明，压降和 HTC 都随着 b/a 的增加而降低。然而，压降更显着地降低。例如，当 b/a 从 1.0 增加到 2.0 时，90 m/s 时的压降和体积 HTC 分别降低了 98.5% 和 6.3%。所以，b/a = 2.0的样品的体积面积良度系数（考虑传热系数和压降对整体传热性能的影响）jv/f值比b/的样品高86.7% a = 1.0 在 90 m/s。随着速度的增加，b/a 对整体传热性能的影响增加。与圆柱骨架速度分布和压降相比，椭圆骨架导致速度分布更均匀，压降显着降低；尽管如此，温度分布几乎没有变化。此外，椭圆骨架增加了比表面积。因此，椭圆骨架的jv/f明显提高。