变物性参数对微通道内纳米流体强制对流换热的影响  

Effect of Variable Thermophysical Properties on Forced Convection Heat Transfer of Nanofluid in a Microchannel

作　　者：白国君[1] 王刚[1] 马兵善[1] 李刚 王杰 

机构地区：[1]兰州理工大学土木工程学院,兰州730050

出　　处：《工程热物理学报》2018年第2期389-394,共6页Journal of Engineering Thermophysics

基　　金：国家自然科学基金资助项目(No.51266006);国家科技支撑计划项目(No.2011BAJ03B08)

摘　　要：对二维微通道内Al_2O_3-水纳米流体的强制对流换热进行了数值研究。主要研究纳米流体的变热物性参数、纳米粒子体积分数φ和Re数对纳米流体强制对流换热的影响。研究表明:在Re数和纳米颗粒体积分数φ一定时,变热物性参数纳米流体比定热物性参数纳米流体在微通道内的强制对流换热强。在Re数一定时,随着纳米粒子体积分数φ的增加,纳米流体换热性能增强。在纳米粒子体积分数φ一定时,随着Re数的增加,纳米流体的换热能力也随之增加。Forced convection heat transfer of Al2O3 numerically. The effects of variable thermophysical -water nanofluid in a microchannel is studied properties of nanofluid, nanoparticles volume fraction φ, and the Reynolds number Re on the forced convective heat transfer of nanofluid are analyzed. The results show that when Re and φ are kept at constant values, the heat transfer rate for nanofluid with variable thermophysical properties is higher than that for nanofluid with constant thermophysical properties. When Re is kept at the fixed value, the heat transfer rate increases with the increase of nanoparticles volume fraction φ. When φ is kept at the fixed value, the heat transfer rate increases as Re increases.

关 键 词：纳米流体 强制对流 微通道 变热物性参数 数值模拟 

分 类 号：TK124[动力工程及工程热物理—工程热物理]