Numerical investigation on the nanofluids heat transfer inside a porous inclined cavity with wavy boundary

IF 1.1 4区工程技术 Q3 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Archives of Mechanics Pub Date : 2020-12-16 DOI:10.24423/AOM.3550

B. Karimi, M. Pirmohammadi, A. Salehi-Shabestari

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Abstract

In the present work, a numerical study on the free-convective heat transfer in a porous media cavity with a wavy boundary was carried out. The validation was done by comparing the results with the experimental data. The cavity inclination angle, material of nanofluid, nanoparticles volume fraction, the Rayleigh number, and porosity of the medium are the parameters which are investigated in this study. Results suggested that, due to the thermophysical properties of Cu particles in water, the heat transfer rate was increased for Cu-Water nanofluid in comparison to Al 2 O 3 -Water nanofluid, while the heat transfer rate decreased by increasing the volume fraction of nanoparticles. Numerical results showed that the Rayleigh number has significant effect on the heat transfer rate so that increase in the Rayleigh number from 100 to 10 000 increased the averaged Nusselt number between 2 to 3 times. The effect of porosity on heat transfer proved that the convective heat transfer rate increased with increasing the porosity of the porous medium. The effect of inclination angle of cavity on the heat transfer rate suggested that the optimum angle of cavity causing the highest heat transfer rate from wavy wall is 45°.

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波浪边界多孔倾斜腔内纳米流体传热的数值研究

本文对具有波浪边界的多孔介质腔内的自由对流换热进行了数值研究。通过与实验数据的比较，验证了该方法的有效性。研究了空腔倾角、纳米流体材料、纳米颗粒体积分数、瑞利数和介质孔隙度等参数。结果表明，由于Cu颗粒在水中的热物理性质，Cu-Water纳米流体的传热速率比Al 2o3 -Water纳米流体高，而随着纳米颗粒体积分数的增加，传热速率降低。数值结果表明，瑞利数对换热速率有显著影响，瑞利数从100增加到10000，平均努塞尔数增加2 ~ 3倍。孔隙率对传热的影响表明，多孔介质的对流换热率随着孔隙率的增大而增大。腔体倾角对换热率的影响表明，腔体倾角为45°时，波壁换热率最高。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Archives of Mechanics 工程技术-材料科学：表征与测试

CiteScore

1.40

自引率

12.50%

发文量

审稿时长

>12 weeks

期刊介绍： Archives of Mechanics provides a forum for original research on mechanics of solids, fluids and discrete systems, including the development of mathematical methods for solving mechanical problems. The journal encompasses all aspects of the field, with the emphasis placed on: -mechanics of materials: elasticity, plasticity, time-dependent phenomena, phase transformation, damage, fracture; physical and experimental foundations, micromechanics, thermodynamics, instabilities; -methods and problems in continuum mechanics: general theory and novel applications, thermomechanics, structural analysis, porous media, contact problems; -dynamics of material systems; -fluid flows and interactions with solids. Papers published in the Archives should contain original contributions dealing with theoretical, experimental, or numerical aspects of mechanical problems listed above. The journal publishes also current announcements and information about important scientific events of possible interest to its readers, like conferences, congresses, symposia, work-shops, courses, etc. Occasionally, special issues of the journal may be devoted to publication of all or selected papers presented at international conferences or other scientific meetings. However, all papers intended for such an issue are subjected to the usual reviewing and acceptance procedure.