Streaming potential and heat transfer of nanofluids in parallel plate microchannels
Streaming potential and heat transfer of nanofluids in parallel plate microchannels
复制标题
平行板微通道中纳米流体的流动势和传热
DOI：
10.1016/j.colsurfa.2016.03.053
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发表时间：
2016-06
期刊：
影响因子：
--
通讯作者：
Fengqin Li
中科院分区：
文献类型：
--
作者：
Guangpu Zhao;Yongjun Jian;Fengqin Li
本文研究了在压力驱动和流势效应共同作用下，热发育纳米流体在平行板微通道中的传热特性。采用debye - h<s:1> ckel线性化方法，得到了微通道内电动流动的解析解。在分析中考虑了均匀壁面热流的经典边界条件，并考虑了粘性耗散和焦耳加热的影响。在速度场和温度场的基础上，推导出了纳米流体的努塞尔数变化，并分析了纳米流体的局部熵产和总熵产的变化。结果表明，流势的分布随着无量纲EDL厚度的增大而减小，而努塞尔数随着无量纲EDL厚度的增大而增大。传热性能随纳米颗粒体积分数的增加而增强。局部熵产从中心线向壁面逐渐增大。总熵产随着br的增大而明显增大。
In the present study, the heat transfer characteristics of thermally developed nanofluid flow through a parallel plate microchannel are investigated under combined influences of pressure-driven and streaming potential effects. The analytical solution for electrokinetic flow in microchannel is obtained by employing the Debye–Hückel linearization. The classical boundary condition of uniform wall heat flux is considered in the analysis, and the effects of viscous dissipation as well as Joule heating are also taken into account. Furthermore, based upon the velocity field and temperature field, the Nusselt number variations are induced, and the variations of local and total entropy generation of nanofluids are also performed. Concisely, the results show the profiles of streaming potential decrease with the dimensionless EDL thickness, whereas the Nusselt number increases with the dimensionless EDL thickness. An enhanced heat transfer performance with increasing nanoparticle volume fraction can be witnessed. The local entropy generation gradually grows from the centerline toward the wall. Beside, the total entropy generation obviously grows with increasingBr.
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