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含旋转圆柱的完全多孔微通道内两相铁纳米流体流动的强制对流分析。

Analysis of the forced convection of two-phase Ferro-nanofluid flow in a completely porous microchannel containing rotating cylinders.

作者信息

Aghamiri Hamidreza, Niknejadi Mohammadreza, Toghraie Davood

机构信息

Department of Mechanical Engineering, Khomeinishahr Branch, Islamic Azad University, Khomeinishahr Khomeinishahr, Iran.

出版信息

Sci Rep. 2021 Sep 8;11(1):17811. doi: 10.1038/s41598-021-97152-3.

DOI:10.1038/s41598-021-97152-3
PMID:34497293
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8426404/
Abstract

In the present work, the forced convection of nanofluid flow in a microchannel containing rotating cylinders is investigated in different geometries. The heat flux applied to the microchannel wall is 10,000 W m. The effects of Reynolds number, the volume fraction of nanoparticles, and the porosity percentage of the porous medium are investigated on the flow fields, temperature, and heat transfer rate. Reynolds number values vary from Re = 250-1000, non-dimensional rotational velocities 1 and 2, respectively, and volume fraction of nanoparticles 0-2%. The results show that increasing the velocity of rotating cylinders increases the heat transfer; also, increasing the Reynolds number and volume fraction of nanoparticles increases the heat transfer, pressure drop, and C. By comparing the porosity percentages with each other, it is concluded that due to the greater contact of the nanofluid with the porous medium and the creation of higher velocity gradients, the porosity percentage is 45% and the values of are 90% higher than the porosity percentage. Comparing porosity percentages with each other, at porosity percentage 90% is greater than at porosity percentage 45%. On the other hand, increasing the Reynolds number reduces the entropy generation due to heat transfer and increases the entropy generation due to friction. Increasing the volume fraction of nanoparticles increases the entropy generations due to heat transfer and friction.

摘要

在本研究中，对包含旋转圆柱的微通道内纳米流体的强制对流在不同几何形状下进行了研究。施加到微通道壁的热通量为10,000 W/m。研究了雷诺数、纳米颗粒的体积分数和多孔介质的孔隙率对流场、温度和传热速率的影响。雷诺数的值在Re = 250 - 1000之间变化，无量纲旋转速度分别为1和2，纳米颗粒的体积分数为0 - 2%。结果表明，增加旋转圆柱的速度会提高传热；此外，增加雷诺数和纳米颗粒的体积分数会提高传热、压降和努塞尔数。通过相互比较孔隙率得出，由于纳米流体与多孔介质的接触更多且产生了更高的速度梯度，孔隙率为45%时的努塞尔数比孔隙率时的值高90%。相互比较孔隙率，孔隙率为90%时的努塞尔数大于孔隙率为45%时的。另一方面，增加雷诺数会减少因传热产生的熵产，并增加因摩擦产生的熵产。增加纳米颗粒的体积分数会增加因传热和摩擦产生的熵产。

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