多尺度复合结构多孔芯热管的制备及其传热特性  

Fabrication and Heat Transfer Performance of Multi-scale Composite Structure Porous Wick Heat Pipe

作　　者：蒋雪微 连利仙[1,2] 唐海 刘颖 JIANG Xuewei;LIAN Lixian;TANG Hai;LIU Ying(College of Materials Science and Engineering,Sichuan University,Chengdu 610065,China;Nanotechnology Application Engineering Technology Research Center of Sichuan Province,Chengdu 610065,China)

机构地区：[1]四川大学材料科学与工程学院,成都610065 [2]四川省纳米科技应用工程技术研究中心,成都610065

出　　处：《机械工程材料》2022年第7期32-37,共6页Materials For Mechanical Engineering

基　　金：四川省科技厅项目(2019ZDZX0022)。

摘　　要：根据热管各部分的功能差异,以纳米多孔铜粉和不规则铜粉为原料,设计并制备了一种新型多尺度复合结构多孔芯热管;该热管蒸发段多孔芯为两层结构,管壁侧为由纳米多孔铜粉烧结而成的小孔隙层,工质腔侧为由不规则铜粉烧结而成的大孔隙层,绝热段和冷凝段多孔芯则均为由不规则铜粉烧结而成的大孔隙层。采用自组装的传热性能测试装置研究了热管的传热性能。结果表明:多尺度复合结构多孔芯的小孔隙层可以提供较高的毛细力,大孔隙层可以提供较大的工质流动通道,从而提升热管传热能力;与单层均匀多孔芯热管相比,多尺度复合结构多孔芯热管表现出了更高的抗重力传热能力,在完全抗重力条件下(倾斜角度为90°)的传热极限功率高达90 W,比由纳米多孔铜粉和不规则铜粉烧结而成的单层均匀多孔芯热管分别提升了2.9倍和2.3倍。According to functional differences of different parts of a heat pipe, a novel multi-scale composite structure porous wick heat pipe was designed and fabricated with nano-porous copper powder and irregular copper powder as raw materials. The porous wick at evaporation section of the heat pipe consisted of a two-layer structure, namely a small-pore layer sintered with nano-porous copper powder on the pipe wall side and a large-pore layer sintered with irregular copper powder on the working medium chamber side. The porous wick at adiabatic section and condensation section had one large-pore layer sintered with irregular copper powder. The heat transfer performance of the heat pipe was investigated by using a self-assembled heat transfer performance test device. The results show that the small-pore layer of the multi-scale composite structure porous wick could provide higher capillary forces, and the large-pore layer could provide larger working medium flow channels, thereby improving the heat transfer capacity of the heat pipe. Comparing with the monolayer uniform porous wick heat pipe, the multi-scale composite structure porous wick heat pipe exhibited a higher heat transfer ability under anti-gravity conditions;and the heat transfer limit power was as high as 90 W under the completely anti-gravity condition(tilt angle of 90°), which was 2.9 times and 2.3 times higher than that of monolayer uniform porous wick heat pipes prepared with nano-porous copper powder and irregular copper powder, respectively.

关 键 词：热管 复合结构多孔芯 微纳结构 传热特性 

分 类 号：TK172.4[动力工程及工程热物理—热能工程]