This paper describes the findings of a numerical and experimental study on the heat transfer coefficient and pressure drop in micro-lattice blocks fabricated by selective laser metal melting and subjected to forced air convection. In particular, the influence of the unit-cell topology on the thermofluid performance of the lattice structure is examined in detail. In the present numerical study, five lattice block designs (BCC, BCCZ, FCC, FCCZ and F2BCC) are considered for investigation. Regarding effective thermal conductivity, the FCC and FCCZ lattices offer the best performance among the various lattices. In terms of heat transfer capacity per unit mass, the BCC and BCCZ lattices exhibit superior characteristics relative to the other lattices. Also, F2BCC lattice offers the lowest pressure loss for a given relative density. In addition, it is found that the heat transfer coefficients obtained by experiment lie between two numerical results having different strut diameter, which is due to the fact that the equivalent strut diameter in the as-manufactured samples is greater, due to the present of additional metal particles fused onto the surfaces of some struts. Moreover, it is found from our experimental investigation that the heat transfer coefficient h for the BCCZ is approximately 1.3 times higher than that for the BCC lattice for the same pressure loss.

本文描述了通过选择性激光金属熔化和强制空气对流制造的微晶格块中传热系数和压降的数值和实验研究结果。特别是，单元格拓扑对晶格结构的热流体性能的影响进行了详细检查。在目前的数值研究中，考虑了五种晶格块设计（BCC、BCCZ、FCC、FCCZ 和 F2BCC）进行研究。关于有效热导率，FCC 和 FCCZ 晶格在各种晶格中提供最佳性能。在每单位质量的传热能力方面，BCC 和 BCCZ 晶格相对于其他晶格表现出优异的特性。此外，对于给定的相对密度，F2BCC 晶格提供最低的压力损失。此外，发现通过实验获得的传热系数介于两个具有不同支柱直径的数值结果之间，这是由于制造样品中的等效支柱直径更大，这是由于存在额外的熔融金属颗粒到一些支柱的表面上。此外，从我们的实验研究中发现，传热系数对于相同的压力损失，BCCZ 的h大约是 BCC 晶格的 1.3 倍。