垂直磁场作用下磁性纳米流体对流换热特性  

CONVECTIVE HEAT TRANSFER CHARACTERISTICS OF MAGNETIC NANOFLUIDS UNDER VERTICAL MAGNETIC FIELD

作　　者：王思娴 罗竹梅[1] 卿山[1] 杨子月 贾壮壮 雷佳杰 Wang Sixian;Luo Zhumei;Qing Shan;Yang Ziyue;Jia Zhuangzhuang;Lei Jiajie(College of Metallurgy and Energy Engineering,Kunming University of Technology,Kunming 650093,China)

机构地区：[1]昆明理工大学冶金与能源工程学院,昆明650093

出　　处：《太阳能学报》2021年第10期111-115,共5页Acta Energiae Solaris Sinica

基　　金：国家自然科学基金(51566005,51966005)。

摘　　要：通过搭建对流换热试验系统对垂直磁场作用下磁性纳米流体对流换热特性进行研究,通过两步法制备体积浓度为0.5%、1.0%、1.5%和2.0%的Fe_(3)O_(4)-H_(2)O纳米流体,在改变有无外加磁场、磁场强度、浓度和温度的条件下研究对流换热系数与雷诺数间的关系。结果表明:对流换热系数随磁场强度的增加而增加;在磁场强度B≥600 G时对流换热系数增加,当磁场强度B=800、1000 G时,对流换热系数平均增加23.89%和26.12%;对流换热系数在恒定磁场影响下的传热的增强同时受纳米颗粒粒子浓度和温度的影响。The convective heat transfer characteristics of magnetic nanofluids under vertical magnetic field were studied by setting up convective heat transfer test system.Fe_(3)O_(4)-H_(2)O nanofluids with volume concentrations of 0.5%,1.0%,1.5% and 2.0% were prepared by two-step method.The relationship between convective heat transfer coefficient and Reynolds number was studied under the conditions of changing magnetic field intensity,concentration and temperature of nanofluids,including with and without the magnetic field.The results show that the convective heat transfer coefficient increases with the increase of magnetic field intensity;When the magnetic field intensity B≥600 G,the convective heat transfer coefficient increases.When the magnetic field intensity B=800 G and B=1000 G,the convective heat transfer coefficient increases by 23.89% and 26.12% on average;The enhancement of convective heat transfer coefficient under the influence of constant magnetic field is affected by the concentration and temperature of nanoparticles.

关 键 词：纳米流体 磁效应 湍流 传热 

分 类 号：TK1[动力工程及工程热物理—热能工程]