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首页> 外文期刊>Journal of Heat Transfer >Influence of Optical Parameters on Magnetohydrodynamic Natural Convection in a Horizontal Cylindrical Annulus
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Influence of Optical Parameters on Magnetohydrodynamic Natural Convection in a Horizontal Cylindrical Annulus

机译：光学参数对水平圆柱环中磁性动力学自然对流的影响

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摘要

The coupled phenomena of radiative-magnetohyrodynamic (MHD) natural convection in a horizontal cylindrical annulus are numerically investigated. The buoyant flow is driven by the temperature difference between the inner and outer cylinder walls, while a circumferential magnetic field induced by a constant electric current is imposed. The hybrid approach of finite volume and discrete ordinates methods (FV-DOM) is developed to solve the nonlinear integro-differential governing equations in polar coordinate system, and accordingly, the influences of Hartmann number, radiation-convection parameter, and optical properties of fluid and wall on thermal and hydrodynamic behaviors of the "downward flow," originally occurring without consideration of radiation and magnetic field, are mainly discussed. The results indicate that both the circulating flow and heat transfer are weakened by the magnetic field, but its suppression effect on the latter is rather small. Under the influence of magnetic field, the "downward flow" pattern has not been obtained from zero initial condition even for the case of weak radiation of N-R = 0.1. Besides, the variation of radiative heat transfer rate with angular positions diminishes for the fluid with strong scattering or weak absorption.
机译：在数值上研究了水平圆柱形环中的辐射 - 磁发流（MHD）自然对流的耦合现象。浮力流动由内筒壁之间的温差驱动，而通过恒定电流引起的圆周磁场被施加。有限体积和离散坐标方法（FV-DOM）的混合方法是开发的，以解决极性坐标系中的非线性积分差分控制方程，因此，Hartmann号，辐射 - 对流参数和流体光学性质的影响主要讨论最初发生的“向下流动”的热和流体动力学行为的墙壁，而不考虑辐射和磁场。结果表明，磁场循环流动和传热均削弱，但其对后者的抑制效果相当小。在磁场的影响下，即使对于N-R = 0.1的弱辐射的情况，尚未从零初始条件获得“向下流动”图案。此外，具有角度位置的辐射传热速率的变化会降低具有强散射或弱吸收的流体。

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