微通道内磁流体流动与换热特性数值模拟  

Numerical simulation of flow and heat transfer characteristics of ferrofluid in microchannels

作　　者：殷泽 戴秋敏[1] 赵颖杰 秦利宇 YIN Ze;DAI Qiumin;ZHAO Yingjie;QIN Liyu(School of Energy and Power Engineering,Nanjing University of Science and Technology,Nanjing 210094,China;School of Energy and Power,Jiangsu University of Science and technology,Zhenjiang 212003,China;Shanghai Aerospace Control Technology Institute,Shanghai 201109,China)

机构地区：[1]南京理工大学能源与动力工程学院,南京210094 [2]江苏科技大学能源与动力学院,江苏镇江212003 [3]上海航天控制技术研究所,上海201109

出　　处：《流体机械》2022年第4期43-50,共8页Fluid Machinery

基　　金：国家自然科学基金项目(52006100);江苏省自然科学基金项目(BK20190469);中央高校基本科研业务专项资金项目(30919011285);飞行器环境控制与生命保障工信部重点实验室基金项目(KLAECLS-E-201905)。

摘　　要：外加磁场力与通道结构是影响微通道内磁纳米流体换热效果的重要因素。为探究磁场方向及流道形状对Fe_(3)O_(4)-H_(2)O纳米流体(体积分数为0.5%)在微通道热沉内流动换热的影响,在入口温度不变、磁场强度相等的条件下,采用数值仿真的方法进行建模、网格划分、设置计算及后处理等。结果表明:在50≤Re≤150范围内,Z型通道加入X(水平)方向磁场后综合换热效果最佳;磁场作用力对S型通道的强化换热程度随Re(雷诺数)的增大而增大。在相同Re条件下,X方向磁场作用下的摩擦阻力系数最大,Y(竖直)方向次之,Z(沿程)方向及无磁场作用下数值接近且最小。The external magnetic field force and channel structure are the important factors that affect the heat transfer effect of magnetic nanofluids in microchannels.In order to explore the influence of magnetic field direction and channel shape on the flow and heat transfer of Fe_(3)O_(4)-H_(2)O nanofluid(volume fraction is 0.5%)in microchannel heat sink,under the condition of constant inlet temperature and equal magnetic field intensity,numerical simulation method was used for modeling,meshing,setting calculation and post-processing,etc.The results show that:in the range of 50≤Re≤150,the comprehensive heat transfer effect of Z-channel after the magnetic field in the X(horizontal)direction is added is the best;the heat transfer enhancement effect of magnetic field force on S-channel increases with the increase of Re.For the same Re,the friction resistance coefficient is the largest in the X direction under the action of magnetic field,followed by the one in the Y(vertical)direction,and the values in the Z(along the way)direction and without the action of magnetic force are close and the lowest.

关 键 词：微通道 磁场 纳米流体 结构 

分 类 号：TH137.8[机械工程—机械制造及自动化] TB126[理学—工程力学]