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首页> 外文期刊>Journal of Heat Transfer >Effect of Radiation on Hydromagnetic Mixed Convective Flow in a Vertical Channel Filled With Porous Media: A Thermal Nonequilibrium Approach
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Effect of Radiation on Hydromagnetic Mixed Convective Flow in a Vertical Channel Filled With Porous Media: A Thermal Nonequilibrium Approach

机译：辐射对填充多孔介质的垂直通道中水磁混合对流的影响：热非平衡方法

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摘要

This work addresses the magnetic and radiation effects on the fully developed mixed convective flow in a vertical channel occupied by a porous medium with the thermal nonequilibrium state. The assumption that the fluid is electrically conducted is taken into account and permitted by a uniform transversal magnetic field while the temperature of the wall is changing linearly with the direction of the fluid flow. The spectral collocation technique is used for the numerical solution, whereas the analytical solution is governed for the special case when the drag force F* and the ratio of porosity-scaled thermal conductivity y are zero. It is observed that, in the buoyancy assisted case, the fluid flow for Ra ＜ 10~2, (Nu_f) increased near the wall with increasing the Hartmann number (M). Beyond this when Ra ≥ 10~2 , (Nu_f) is decreased with increasing M. It is also perceived that there exists an interval [O,H_0] in which (Nu_f) increases with increasing M as well as increasing radiation parameter R_d, furthermore beyond the value of H_0, Nu_f decreasing asymptotically. While for the buoyancy opposed case, the flow separation and inflection point appear in the velocity profile for different values of M, further both the flow separation and inflection point are dying out as M increases. Overall, for the both cases, the magnetic and radiation parameters are stabilizing the flow in the system.
机译：这项工作解决了在垂直通道中充分发展的混合对流流动的磁和辐射效应，该垂直通道被具有热非平衡状态的多孔介质占据。当壁的温度随流体流动方向线性变化时，考虑并假设流体导电。数值配置使用频谱搭配技术，而在特殊情况下，当牵引力F *和孔隙度导热系数y的比值为零时，则采用解析解。观察到，在浮力辅助情况下，随着壁的哈特曼数（M）的增加，Ra ＜10〜2（Nu_f）的流体流量增加。除此之外，当Ra≥10〜2时，（Nu_f）随着M的增加而减小。还可以看出存在[O，H_0]的间隔，其中（Nu_f）随着M的增加以及辐射参数R_d的增加而增加。超出H_0的值，Nu_f渐近减小。对于浮力相反的情况，对于不同的M值，流速分布中出现了流分离和拐点，随着M的增加，流分离和拐点都消失了。总体而言，对于这两种情况，磁和辐射参数都在稳定系统中的流量。

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