MHD free convection of Al2O3–water nanofluid considering thermal radiation: A numerical study
MHD free convection of Al2O3–water nanofluid considering thermal radiation: A numerical study
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DOI：
10.1016/j.ijheatmasstransfer.2016.01.059
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发表时间：
2016-05
影响因子：
5.2
通讯作者：
M. Sheikholeslami;T. Hayat;T. Hayat;A. Alsaedi
中科院分区：
文献类型：
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作者：
M. Sheikholeslami;T. Hayat;T. Hayat;A. Alsaedi
本文探讨了热辐射对Al 2 O3-水纳米流体流动和传热的影响，在一个封闭的恒定通量加热元件。采用KKL（Koo-Kleinstreuer-Li）关联式模拟纳米流体的有效导热系数和粘度。控制方程采用基于控制体积的有限元法求解。考察了瑞利数、哈特曼数、粘性耗散参数、辐射参数和纳米颗粒体积分数对流动和换热特性的影响。结果表明，强化传热与哈特曼数、粘性耗散参数和辐射参数成正比，与瑞利数成反比。Nusselt数是Rayleigh数、纳米粒子体积分数和辐射参数的增函数，而粘性耗散参数和Hartman数则是Nusselt数的减函数。
This article explores the effect of thermal radiation on Al2O3–water nanofluid flow and heat transfer in an enclosure with a constant flux heating element. KKL (Koo–Kleinstreuer–Li) correlation is used for simulating effective thermal conductivity and viscosity of nanofluid. The governing equations are solved via control volume based finite element method. The effects of Rayleigh number, Hartman number, viscous dissipation parameter, radiation parameter and volume fraction of nanoparticle on the flow and heat transfer characteristics have been examined. Results show that enhancement in heat transfer has direct relationship with Hartman number, viscous dissipation parameter and radiation parameter but it has reverse relationship for Rayleigh number. It is also observed that Nusselt number is an increasing function of Rayleigh number, volume fraction of nanoparticle and radiation parameter while it is a decreasing function of viscous dissipation parameter and Hartman number.