Modeling and CFD Simulation of a Mixed‐Convection Flow of Regular Fluids and Nanofluids in Vertical Porous and Regular Channels

A. Hashemi, A. Dehkordi
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引用次数: 8

Abstract

In this article, the problem of combined forced and free convection in vertical porous and regular channels for both regular fluids and nanofluids has been solved using the CFD technique in the entrance regions of momentum and heat transfer taking into account the influences of viscous heating and inertial force. In this regard, various types of viscous dissipation models reported in the literature such as the Darcy model, the power of the drag force model, and the clear fluid‐compatible model were applied. In the case of nanofluid flow, both the Brownian and thermophoresis molecular transfer mechanisms were considered. The dimensionless distributions of velocity, temperature, and the volume fraction of nanoparticles were determined in terms of corresponding dimensionless numbers such as the Grashof, Reynolds, Forchheimer, Brinkman, and Darcy numbers. The predicted results were validated using fully‐developed distributions of velocity and temperature. In addition, the influences of the Grashof number value on the temperature and velocity distributions in the entrance and fully‐developed regions were examined carefully. In addition, temperature and velocity distributions of nanofluids and regular fluids in porous and regular channels were compared. © 2013 Wiley Periodicals, Inc. Heat Trans Asian Res, 43(3): 243–269, 2014; Published online 30 September 2013 in Wiley Online Library (wileyonlinelibrary.com/journal/htj). DOI 10.1002/htj.21079
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垂直多孔和规则通道中规则流体和纳米流体混合对流流动的建模和CFD模拟
本文在考虑粘性加热和惯性力影响的情况下,利用CFD技术求解了垂直多孔和规则通道中规则流体和纳米流体的强制对流和自由对流联合问题。在这方面,应用了文献中报道的各种类型的粘性耗散模型,如达西模型、阻力功率模型和透明流体相容模型。在纳米流体流动的情况下,考虑了布朗和热泳分子传递机制。用相应的无因次数(如Grashof、Reynolds、Forchheimer、Brinkman和Darcy数)确定了纳米颗粒的速度、温度和体积分数的无因次分布。利用充分发展的速度和温度分布验证了预测结果。此外,还仔细研究了Grashof数值对入口和完全发育区域温度和速度分布的影响。此外,还比较了纳米流体和常规流体在多孔通道和规则通道中的温度和速度分布。©2013 Wiley期刊公司热力学报,43(3):243-269,2014;2013年9月30日在线发表于Wiley在线图书馆(wileyonlinelibrary.com/journal/htj)。DOI 10.1002 / htj.21079
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