点阵单元类型和排布角度对传热特性的影响

基于瞬态液晶测试技术和数值仿真，在相同孔隙率条件下，研究了桁架型点阵结构的单元类型和排布角度对矩形通道壁面对流传热特性的影响。结果表明:点阵单元类型对壁面传热性能有决定性的影响，其中交叉排布的体心立方（body centered cubic-0,BCC-0）和Kagome-0点阵归因于出色的传热强化效果，雷诺数在5 700~17 100的范围内，其综合传热效率分别比柱肋阵列高出了9%~21%和4%~12%；而共线排布的面心立方点阵（face centered cubic,FCC）则都表现出较低的传热性能。在单元类型相同的条件下，选择合适的排布角度有利于进一步提高传热性能，其中Kagome-90和BCC-0分别比Kagome-0和BCC-45点阵的传热效率高3%~10%和5%~15%。 

Influences of lattice unit type and arrangement orientation on heat transfer characteristics

Based on the transient liquid crystals technology and numerical simulation，the influences of truss-type lattice unit type and arrangement orientation on convective heat transfer characteristics for a given porosity were analyzed.Experimental results showed that the convective heat transfer performance was mainly determined by the unit type.Due to excellent heat transfer enhancement，within Reynolds number 5 700-17 100，the staggered body centered cubic-0 （BCC-0） lattice and the Kagome-0 lattice exhibited 9%-21% and 4%-12% higher overall thermal efficiency compared with the pin fin array.In contrast，the inline face centered cubic （FCC） lattices showed a lower heat transfer performance.For the same unit type，choosing a suitable arrangement angle was conducive to further improving the thermal performance.For instance，the thermal efficiency of the Kagome-90 and the BCC-0 were 3%-10% and 5%-15% higher than that of the Kagome-0 and the BCC-45，respectively.