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首页> 外文期刊>Applied thermal engineering: Design, processes, equipment, economics >Nanofluid flow and heat transfer in a microchannel with longitudinal vortex generators: Two-phase numerical simulation
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Nanofluid flow and heat transfer in a microchannel with longitudinal vortex generators: Two-phase numerical simulation

机译：带有纵向涡流发生器的微通道中的纳米流体流动和传热：两相数值模拟

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Here we report a comprehensive numerical procedure based on the two-phase approach to simulate a rectangular microchannel consisting of six longitudinal vortex generators (LUGS). Nanofluids are used to remove heat generated within the microchannel. The simulations performed in this paper are based on the newest version of the two-phase Eulerian-Eulerian approach. The TiO2-based nanofluids with different base-fluids of water, ethylene glycol and water mixture (EG:W (60:40 by mass)) and transformer oil are considered for simulations. The nanoparticles are 21, 40 and 60 nanometers in diameter with the volume concentrations of 1.0, 1.6 and 2.3%. We found that nanofluids together with LUGS can remarkably enhance the heat exchange rates inside the microchannel. The heat transfer coefficient was shown to improve under increasing nanoparticle (TiO2) concentrations and Reynolds number, whereas the opposite trends were observed for friction factor. Results of this study indicate that using the mixture of EG:W (60:40 ethylene glycol and water) instead of pure water as a base-fluid leads to the increase of heat transfer in the microchannel. Finally, the maximum normalized efficiency of the LVG-enhanced microchannel, compared to the plain channel, is around 14%. Furthermore, using nanofluid can improve the normalized efficiency by 27%. (C) 2016 Elsevier Ltd. All rights reserved.
机译：在这里，我们报告一种基于两阶段方法的综合数值程序，以模拟由六个纵向涡流发生器（LUGS）组成的矩形微通道。纳米流体用于去除微通道内产生的热量。本文执行的仿真基于两阶段欧拉-欧拉方法的最新版本。考虑使用具有不同基础流体的水，乙二醇和水混合物（EG：W（质量比为60:40））和变压器油的TiO2基纳米流体。纳米粒子的直径为21、40和60纳米，体积浓度为1.0、1.6和2.3％。我们发现纳米流体与LUGS一起可以显着提高微通道内部的热交换率。结果表明，随着纳米颗粒（TiO2）浓度和雷诺数的增加，传热系数提高，而摩擦系数却呈现相反的趋势。这项研究的结果表明，使用EG：W（60:40乙二醇和水）的混合物代替纯水作为基础流体会导致微通道中传热的增加。最后，与普通通道相比，LVG增强的微通道的最大归一化效率约为14％。此外，使用纳米流体可以将标准化效率提高27％。 （C）2016 Elsevier Ltd.保留所有权利。

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