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Effect of nano-fluid types on the improvement of heat transfer in a micro-channel with regular hexagonal pattern
Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering ( IF 2.3 ) Pub Date : 2020-06-28 , DOI: 10.1177/0954408920932349
S Emami 1 , MH Dibaei Bonab 1 , M Mohammadiun 1 , H Mohammadiun 1 , M Sadi 1
Affiliation  

Micro channels are widely used in different industries. The investgations on heat transfer improvments of these instruments are of significant inportance. At hte present study, the influence of different nano-fluids and geometrical charectrestics on the thermal performance of a heat sink which is especially for for micro-channels are investigated. In the present study, the authors investigated the Nusselt number and pressure drop in differential geometries and Reynolds numbers (Re). Then the micro-channel was investigated with different heat flux (q).In the first step, the micro-channel was examined and the final numerical results showed that the hexagonal cross-section can improve heat transfer about 9%. At the second step and after selecting appropriate parameters, the effect of three nano-particles (Al2O3 - CuO- TiO2) were studied. The results presented that aluminum oxide (Al2O3) has the best heat transfer rate among the mentioned nano-fluids. With the presence of nano-particles (Al2O3, φ = 4%) an increment of 40% in heat transfer rate, for the hexagonal cross section was achieved compare to rectangular cross section with water as working fluid.

中文翻译:

纳米流体类型对正六边形微通道传热改善的影响

微信广泛应用于不同行业。对这些仪器的传热改进的投资具有重要意义。在目前的研究中,研究了不同纳米流体和几何特性对散热器热性能的影响,特别是用于微通道。在本研究中,作者研究了微分几何和雷诺数 (Re) 中的努塞尔数和压降。然后用不同的热通量(q)研究微通道。在第一步中,对微通道进行了研究,最终的数值结果表明,六边形截面可以提高约 9% 的传热。第二步,在选择合适的参数后,研究了三种纳米颗粒(Al2O3-CuO-TiO2)的影响。结果表明,在上述纳米流体中,氧化铝 (Al2O3) 具有最佳的传热率。随着纳米颗粒 (Al2O3, φ = 4%) 的存在,传热率增加了 40%,与以水为工作流体的矩形截面相比,六边形截面实现了。
更新日期:2020-06-28
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