摘要
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.
出处
《西安交通大学学报》
EI
CAS
CSCD
北大核心
2014年第7期12-16,共5页
Journal of Xi'an Jiaotong University
基金
国家重点基础研究发展规划资助项目(2011CB6103005)
高等学校学科创新引智计划资助项目(B06024)
国家自然科学基金资助项目(51206128)