摘要
为研究纳米流体种类及浓度、热沉材料、狭缝长宽比对热沉换热性能及热应力的影响,建立了微通道狭缝冲击射流热沉三维模型。利用数值模拟得到纳米流体在通道形状为圆形和矩形热沉中的压降、热阻、泵功及壁面与流体之间的温差大小,同时也得到不同材料的热沉由于温度分布不均匀而引起的形变量的大小,研究结果表明:通道形状为圆形的热沉在导致泵功及压降增加的同时,使得热阻和壁面与流体之间的温差减小;高体积分数的纳米流体增加了压降,但使得热沉热阻降低;材料热导率越大,换热综合性能越好;由温度分布不均导致的热应力变形大小次序为铝>铜>铁>硅;狭缝长宽比越大,热阻越低,随着泵功的增加,狭缝长宽比不同的4种热沉之间热阻差值越小。
In order to study the effects of nanofluid type and concentration,heat sink material,and slit length-to-width ratio on heat transfer performance and thermal stress of heat sink,a three-dimensional model of the hybrid micro-channel and slot-jet module was established.The pressure drop,thermal resistance,pump power and temperature difference between the wall and the fluid of the nanofluid in the circular and rectangular heat sink were obtained by numerical simulation.The size of the deformation of heat sinks of different materials due to uneven temperature distribution were obtained by numerical simulation.The results show that when the channel shape is circular,the pump power and pressure drop increase,and the thermal resistance and the temperature difference with the wall fluid decrease.The larger the volume fraction of nanofluid,the greater the pressure drop and the lower the thermal resistance of the heat sink.The greater the thermal conductivity of the material,the better the overall heat transfer performance.The order of thermal stress deformation caused by uneven temperature distribution is aluminum>copper>iron>silicon.The greater the slit aspect ratio,the lower the thermal resistance.As the pump power increases,the thermal resistance difference between the four heat sinks with different slit aspect ratios is smaller.
作者
卢风雄
于帆
隆耀成
LU Feng-xiong;YU Fan;LONG Yao-cheng(School of Energy and Environmental Engineering,University of Science and Technology Beijing,Beijing 100083,China;School of Resources and Environment,Lanzhou University,Lanzhou 730000,Gansu Province,China)
出处
《化学工程》
CAS
CSCD
北大核心
2021年第4期23-28,45,共7页
Chemical Engineering(China)
关键词
微通道狭缝冲击射流热沉
纳米流体
数值模拟
长宽比
hybrid micro-channel slot-jet module
nanofluid
numerical simulation
length to width ratio
作者简介
卢风雄(1997-),男,硕士研究生,研究方向为微通道流动换热与热应力分析,电话:18810522307;通信联系人:于帆(1964-),男,博士,教授,研究方向为材料热物理性质测量及电子器件热管理技术,E-mail:fanyu@me.ustb.edu.cn。
