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Effect of shape of nanoparticle on heat transfer and entropy generation of nanofluid-jet impingement cooling
International Journal of Green Energy ( IF 3.3 ) Pub Date : 2020-06-20 , DOI: 10.1080/15435075.2020.1739692
Recep Ekiciler 1 , Muhammet Samet Ali Çetinkaya 2 , Kamil Arslan 2
Affiliation  

Al2O3/water nanofluid has been numerically examined for the first time with different nanoparticle shapes including, cylindrical, blade, brick, platelet and spherical, on the flat and triangular-corrugated impinging surfaces. The volume fractions of 1.0%, 2.0% and 3.0% nanoparticles have been used. The Reynolds number is between 100–500 depending on the slot diameter. The finite volume method is utilized to determine the governing equations. The study is analyzed to determine how the flow features, heat transfer features and entropy production were affected by the diversity of nanoparticle shape, nanoparticle volume fraction, and shape of impinging surface. Darcy friction factor and Nusselt number are studied in detail for different conditions. The temperature contours are presented in the case of different nanoparticle volume fractions, nanoparticle shapes and both impinging surfaces. The results of the study suggest that the nanoparticle shape of the platelet shows the highest heat transfer development due to the thinner thermal boundary layer. Heat transfer augments with increasing volume fraction of nanoparticles. In addition, the study is consistent with the results of the literature on heat transfer and flow properties.



中文翻译:

纳米颗粒形状对纳米流体射流冲击冷却传热和熵产生的影响

2 O 3首次对水/纳米流体进行了数值检验,在平坦和三角形波纹的撞击表面上使用了不同的纳米颗粒形状,包括圆柱,刀片,砖块,薄片和球形。已经使用了1.0%,2.0%和3.0%的纳米颗粒的体积分数。雷诺数在100–500之间,具体取决于插槽直径。利用有限体积法确定控制方程。分析该研究,以确定纳米颗粒形状,纳米颗粒体积分数和撞击表面形状的多样性如何影响流动特征,传热特征和熵产生。在不同条件下详细研究了达西摩擦系数和努塞尔数。在不同纳米颗粒体积分数的情况下,显示了温度等高线,纳米颗粒形状和两个撞击表面。研究结果表明,由于较薄的热边界层,血小板的纳米颗粒形状显示出最高的传热发展。传热随着纳米颗粒体积分数的增加而增加。另外,该研究与关于传热和流动性质的文献结果一致。

更新日期:2020-06-26
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