文献类型：期刊文献

英文题名：Effect of the working fluid transportation in the copper composite wick on the evaporation efficiency of a flat loop heat pipe

作者：Xu, Jiayin[1];Wang, Dongcheng[1];Hu, Zhuohuan[1];Zhang, Li[2];Ye, Li[1];Zhou, Yuren[3]

机构：[1]Univ Shanghai Sci & Technol, Sch Energy & Power Engn, Shanghai Key Lab Multiphase Flow & Heat Transfer, Shanghai 200093, Peoples R China;[2]East China Univ Sci & Technol, Sch Mech & Power Engn, Shanghai 200237, Peoples R China;[3]Shanghai Inst Measurement & Testing Technol, Shanghai 201203, Peoples R China

年份：2020

卷号：178

外文期刊名：APPLIED THERMAL ENGINEERING

收录：;EI(收录号：20202408812443);WOS:【SCI-EXPANDED(收录号:WOS:000552131100031)】；

基金：The authors are grateful for the supports of the National Natural Science Foundation of China (No. 51776074) and National Natural Science Foundation of China (No. 51306122).

语种：英文

外文关键词：LHP; Composite wick; Copper wick; Evaporation efficiency; Working fluid transportation; Permeability

摘要：An excellent heat transfer performance of the loop heat pipe (LHP) was not only dependent on the efficient evaporation in the evaporating zone, but also on the working fluid transportation in the wick. A double-layered composite copper wick for both efficient evaporation and high permeability was proposed to eliminate the vapor trap in the wick at high heat loads. The transportation layer was 2 mm in thickness near the compensation chamber, and the evaporation layer was 3 mm in thickness facing the evaporating zone. It was experimentally found that vapor trap and dry-out in the wick at high heat loads were relieved, because the balance between high flow rate of working fluid supply and efficient evaporation was achieved. The optimized composite wick with the particle sizes ranging from 96-180 mu m and 48-96 mu m was ideal for the liquid transportation and evaporation in the wick, respectively. The LHP could start in 120 s stably at a low heat load of 20 W (2.83 W/cm(2)), and a maximum heat load of 140 W (19.80 W/cm(2)) was achieved at the allowable evaporator wall temperature of 90 degrees C. The highest heat transfer coefficient was 30,794 W/m(2) K, and the lowest evaporator thermal resistance and LHP thermal resistance were only 0.046 degrees C/W and 0.143 degrees C/W, respectively, at a heat load of 140 W.