R. Nimmagadda, Durga Prakash Matta, R. Reuven, L. G. Asirvatham, S. Wongwises, Anjaneyulu Yerramilli, Srinath Adusumilli
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引用次数: 2
摘要
采用二维数值研究方法,研究了均匀和非均匀磁场作用下Al2O3 + Ag混合纳米流体在固体块盖驱动腔内的换热性能。几何域由包含纳米流体的空腔组成,该空腔由沿一个方向移动的盖子驱动。这种循环的纳米流体将从腔下的固体块中提取大量的热量,从而产生共轭传热。本文提出了一种基于有限体积法的共轭传热齐次求解方法。本研究使用Nimmagadda和Venkatasubbaiah[1]获得的热效率高的杂化纳米流体(HyNF)对(2.4 vol.% Ag + 0.6 vol.% Al2O3)。此外,还实现了Nimmagadda等[2]识别的高效非均匀正弦磁场,并与均匀磁场进行了比较。在几何域上沿两个轴向分别施加磁场,得到了有效的换热性能。系统分析了雷诺数、纳米颗粒类型、纳米颗粒浓度、磁场类型、磁场位置和磁场强度等广泛参数对换热性能的显著影响。
Effect of Magnetic Field on the Laminar Heat Transfer Performance of Hybrid Nanofluid in a Lid Driven Cavity Over Solid Block
A 2D numerical investigation has been carried out to obtain the heat transfer performance of hybrid (Al2O3 + Ag) nanofluid in a lid driven cavity over solid block under the influence of uniform as well as non-uniform magnetic field. The geometrical domain consists of a cavity containing nanofluid that is driven by means of lid moving in one direction. This circulating nanofluid will extract enormous amount of heat from the solid block underneath the cavity resulting in conjugate heat transfer. A homogenous solver based on the finite volume method with conjugate heat transfer was developed and adopted in the existing study. The heat efficient hybrid nanofluid (HyNF) pair (2.4 vol.% Ag + 0.6 vol.% Al2O3) obtained by Nimmagadda and Venkatasubbaiah [1] is used in the present investigation. Moreover, efficient non-uniform sinusoidal magnetic field identified by Nimmagadda et al. [2] is also implemented and compared with uniform magnetic field. Furthermore, the magnetic field is applied over the geometrical domain along the two axial directions separately and the effective heat transfer performance is obtained. The significant impact of extensive parameters like Reynolds number, nanoparticle type, nanoparticle concentration, magnetic field type, magnetic field location and the strength of the magnetic field on heat transfer performance are systematically analyzed and presented.