金属丝网编织Kagome自然对流实验研究

Experimental Investigation to Natural Convective Heat Transfer in Wire-Woven Bulk Kagome Truss

为了研究金属丝网编织Kagome（WBK）热沉自然对流换热性能及其影响因素,对WBK热沉进行了大空间稳态自然对流实验研究。鉴于WBK热沉结构上强烈的各向异性,在不同面烧结铝基板进行总传热热阻测量。设计搭建了具有0°～90°任意旋转功能的实验台,对不同倾角下的自然对流换热热阻进行了测量。作为参照,选取与WBK热沉相同尺寸的光板进行了稳态自然对流热阻测量。研究结果表明：与光表面相比,WBK芯体具有更高的比表面积,可以有效地降低自然对流换热热阻,为光表面的42%左右。WBK芯体3个方向的对流换热热阻不同,显示出强烈的各向异性,具有适中堵塞率（迎风面积）的o-b方向具有最小的热阻。在0°～90°倾角内,WBK芯体在3个方向均存在一个最佳倾角,约为50°,相应的换热热阻最小。

Natural convection on a novel periodic lattice frame material wire-woven bulk Kagomesintered plate（WBK）at different inclination angles is experimentally investigated,and overall heat transfer performance is evaluated by the total thermal resistance concerning the effects of orientations（o-a,o-b,and o-c）and inclination angles covering 0°（horizontal orientation）,15°,30°,45°,60°,75°,and 90°（vertical orientation）.The optimal inclination angle is found to approach 50°,corresponding to the minimum thermal resistance at a heat flux of 1 150 W/m2.The average thermal resistance for WBK specimens gets 42% that of the smooth plate in the Rayleigh number range of 6.1×107-2.2×108.The heat transfer performance（thermal resistance）of WBK sample is different in three orientations due to its strong anisotropic topology：o-b orientation has smallest thermal resistance,but o-aorientation has the biggest one.Moderate blockage ratio results in relatively high flow mixing but acceptable flow resistance,ultimately leading to enhancing natural convective heat transfer.