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首页> 外文期刊>International journal of numerical methods for heat & fluid flow >Natural convection of a hybrid nanofluid subjected to non-uniform magnetic field within porous medium including circular heater
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Natural convection of a hybrid nanofluid subjected to non-uniform magnetic field within porous medium including circular heater

机译：混合纳米流体在包括圆形加热器的多孔介质中受到非均匀磁场的自然对流

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PurposeThis paper aims to numerically investigate the natural convection heat transfer of a hybrid nanofluid into a porous cavity exposed to a variable magnetic field.Design/methodology/approachThe non-linear elliptical governing equations have been solved numerically using control volume based finite element method. The effects of different governing parameters including Rayleigh number (Ra = 103 106), Hartman number (Ha = 0 50), volume fraction of nanoparticles ( = 0 0.02), curvature of horizontal isolated wall (a = 0.85 1.15), porosity coefficient ( = 0.1 0.9) and Darcy number (Da = 105 101) have been studied.FindingsThe results indicate that at low Darcy numbers close to 0, the average Nusselt number Nua enhances as porosity coefficient increases. For a = 1 and a = 1.15 in comparison with a = 0.85, the stretching of the isothermal lines is maintained from the left side to the right side and vice versa, which indicates increased natural convection heat transfer for this configuration of the top and bottom walls. In addition, at higher Rayleigh numbers, by increasing the Hartmann number, a significant decrease is observed in the Nusselt number, which can be attributed to the decreased power of the flow.Originality/valueThe authors believe that all the results, both numerical and asymptotic, are original and have not been published elsewhere.
机译：目的本文旨在对混合纳米流体向暴露于可变磁场的多孔腔中的自然对流传热进行数值研究。设计/方法/方法已使用基于控制体积的有限元方法对非线性椭圆控制方程进行了数值求解。不同控制参数的影响包括瑞利数（Ra = 103106），哈特曼数（Ha = 0 50），纳米颗粒的体积分数（= 0 0.02），水平隔离墙的曲率（a = 0.85 1.15），孔隙率（ = 0.1 0.9）和达西数（Da = 105101）的研究结果表明，在低达西数接近0时，平均Nusselt数Nua随着孔隙率系数的增加而增强。对于a = 1和a = 1.15（与a = 0.85相比），等温线的拉伸从左侧保持到右侧，反之亦然，这表明顶部和底部这种配置的自然对流换热增加墙壁。此外，在较高的瑞利数下，通过增加Hartmann数，可以观察到Nusselt数的显着下降，这可以归因于流动能力的降低。原始性/价值作者认为所有结果，包括数值和渐近的，是原始的，尚未在其他地方发布。

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