不同接触角微肋阵内的对流换热及能效特性  

Convective heat transfer and energy efficiency characteristics in hydrophobic micro-pin fins with different contact angles

作　　者：祝叶[1] 赵孝保[1] 管宁[2] 姜桂林[2] 刘志刚[2] 张承武[2] 李栋[1] 

机构地区：[1]南京师范大学能源与机械工程学院,江苏省能源系统过程转化与减排技术工程实验室,江苏南京210042 [2]山东省科学院流动与强化传热重点实验室,山东省科学院能源研究所,山东济南250014

出　　处：《山东科学》2016年第3期40-47,共8页Shandong Science

基　　金：国家自然科学基金(51306107);山东省科技发展计划(2014GGX104008);山东省优秀中青年科学家科研奖励基金(BS2014NJ013)

摘　　要：在椭圆形微肋阵表面固化含有微纳米粒子的疏水性涂层获得具有不同接触角的疏水性微肋阵,测试不同雷诺数Re下实验段内的压降、流动阻力系数f及努塞尔数Nu,并分析了接触角变化对微肋阵热沉内流阻和换热的综合影响及其能效特性。研究结果表明,疏水性涂层具有显著的减阻效果,压降和流动阻力系数随接触角增大而减小;但疏水性微肋阵内的Nu也降低,且3种疏水性微肋阵内Nu之间的偏差随功率的增加而增大;尽管表面疏水性降低了微肋阵内Nu,接触角为151.5°超疏水微肋阵仍具有较好的能效特性,与无疏水性涂层的微肋阵相比,相同对流换热量时其所需泵功可减少200%以上。Hydrophobic micro-pin fins with different contact angles are obtained by solidifying nano-particles involved hydrophobic coating on the surface of oval micro-pin fins. Pressure drop, friction factor f and Nusselt number Nu for different Reynolds numbers are measured. The impact of the variation of contact angles on heat sink flow resistance and heat transfer of micro-pin fins and energy efficiency characteristics are also analyzed comprehensive. Results demonstrate that hydrophobic coating has significant resistance reduction effeCt. Pressure drop and flow resistance coefficient decrease with the increase of contact angles. However, Nu in hydrophobic micro-pin fins also decreases, and Nu deviation in the three hydrophobic micro-pin fins increases with the increase of heat power. Although hydrophobic surface reduces Nu in micro-pin fins, super-hydrophobic micro-pin fins with contact angle of 151.5°have better energy efficiency characteristics. Compared with those without hydrophobic coating, required pump power can be reduced by more than 200% for the same convective heat transfer.

关 键 词：疏水性 微肋阵 减阻 努塞尔数 能效 

分 类 号：TK124[动力工程及工程热物理—工程热物理]