摘要
为探究磁场强度和磁场方向对微通道内Fe_(3)O_(4)-H_(2)O纳米磁流体流动换热性能的影响,采用数值模拟的方法,以矩形微通道热沉为研究对象,对不同磁场强度和磁场方向作用下的微通道,在雷诺数为200—500之间展开仿真研究,模拟微通道内流体工质流动换热过程。结果表明:进出口压降随雷诺数的增大而增大,且随着磁场强度的增大,压降的增大趋势愈显著;微通道的换热性能随着磁场强度的增大,呈现出先增大后减小的趋势。研究发现Z(水平)方向磁场作用力造成的压力损失最大,对换热性能的提升最为明显,综合换热性能最佳,Y(竖直)方向次之,X(沿程)方向与无磁场作用时数值接近且最小。
Taking rectangular microchannel heat sink as the research object,numerical simulation method was used to simulate the flow and heat transfer process of fluid in microchannel with different magnetic field intensity and magnetic field direction in the range of Re 200-500 in order to investigate the effect of magnetic field intensity and direction on the flow and heat transfer performance of Fe_(3)O_(4)-H_(2)O magnetic nanofluid in microchannel.The results show that the inlet and outlet pressure drop increases with the increase of Re and with the increase of magnetic field intensity,the increasing trend of pressure drop is more obvious.With the increase of magnetic field intensity,the heat transfer performance of microchannel increases at first and then decreases.It is found that the pressure loss caused by magnetic field in Z(horizontal)direction is the largest,and the improvement of heat transfer performance is the most obvious,and the comprehensive heat transfer performance is the best,followed by Y(vertical)direction,and the value of X(along)direction is close to that without magnetic field and is the smallest.
作者
曹卫华
张锁程
朱继元
CAO Wei-hua;ZHANG Suo-cheng;ZHU Ji-yuan(School of Mechanical and Control Engineering,Guilin University of Technology,Guilin 541000,Guangxi,China)
出处
《化学工程》
CAS
CSCD
北大核心
2023年第4期51-55,共5页
Chemical Engineering(China)
基金
国家自然科学基金资助项目(52075110,61961011)。
关键词
微通道换热器
纳米磁流体
磁场作用
流动传热特性
microchannel heat sink
magnetic nanofluid
magnetic field effect
flow heat transfer characteristic
