Ag纳米流体浸没射流冲击换热特性  

Heat transfer of sub-merged jet impingement on pin-fin heat sinks with silver nanofluid

作　　者：夏国栋[1] 周明正[1] 周利军[1] 崔珍珍[1] 杨瑞波[1] 

机构地区：[1]北京工业大学环境与能源工程学院,强化传热与过程节能教育部重点实验室暨传热与能源利用北京市重点实验室,北京100124

出　　处：《化工学报》2011年第4期916-921,共6页CIESC Journal

基　　金：国家自然科学基金项目(50876003);北京市自然科学基金项目(3092009);北京市属高等学校人才强教计划项目(PHR200906104)~~

摘　　要：采用超声膜扩散法一步制备出水基Ag纳米流体作为实验工质,并对不同质量分数的Ag纳米流体在受限浸没阵列射流冲击针肋热沉中的流动和换热特性进行了实验研究。结果表明:采用超声膜扩散法制备的Ag纳米颗粒粒径分布均匀,平均粒径只有4.8 nm;表面活性剂对纳米流体的黏度影响较大;相同射流速度下,与基液(水+表面活性剂)相比,Ag粒子质量分数分别为0.02%、0.08%、0.12%的纳米流体传热系数分别提高6.23%、9.24%、17.53%;与纯水相比,Ag粒子质量分数为0.12%时,纳米流体传热系数增加6.61%。Silver-water nanofluid,used as the working fluid in this study,was prepared in one step employing ultrasound-assisted membrane reaction.The heat transfer of submerged jet impacting pin-fin heat sinks was investigated experimentally with silver nanofluid of different concentrations.The results indicate that the silver nanoparticles prepared are uniformly distributed in base fluid and with an average grain size of 4.8 nm.The surfactant used in this study has great influence on the viscosity of nanofluids.Compared with the base fluid（water and surfactant）,the heat transfer coefficient of nanofluids is increased by 6.23%,9.24% and 17.53%,respectively,with the silver nanoparticle mass fraction of 0.02%,0.08% and 0.12%,under the same jet velocity.Compared with water,the heat transfer coefficient is enhanced by 6.61% with the silver nanoparticle of 0.12%.

关 键 词：纳米流体 浸没射流 表面活性剂 传热系数 

分 类 号：TK124[动力工程及工程热物理—工程热物理]