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首页> 外文期刊>International Journal of Heat and Mass Transfer >Unsteady numerical computation of combined thermally and electromagnetically driven convection in a rectangular cavity
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Unsteady numerical computation of combined thermally and electromagnetically driven convection in a rectangular cavity

机译：矩形腔内热和电磁驱动对流的非定常数值计算

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摘要

A series of numerical simulations of fluid flow and heat transfer based on two-dimensional unsteady model of MHD thermal convection have been performed. The computational domain is a rectangular cavity with an aspect ratio of 2, filled with electrically conductive fluids at different Prandtl numbers. The process medium is assumed to be subjected to DC heating by a pair of plate electrodes located at the cavity sidewalls. The top and bottom walls are assumed to be electrically insulated. The upper boundary of the cavity is cooled by the atmosphere and all the other walls are kept thermally insulated. For Pr=1 and Pr=0.1 fluid, the simulation results show that the fluid flow and heat transfer rate become time independent and reach steady-state conditions. On the contrary, for Pr = 0.01 fluid, it is found that physically realizable periodic oscillation flow evolves, significantly affecting the heat transfer. These transient characteristics of velocity and temperature fields are presented graphically.
机译：基于MHD热对流的二维非定常模型，对流体流动和传热进行了一系列的数值模拟。计算域是一个长宽比为2的矩形腔，其中填充了不同Prandtl数的导电流体。假定通过位于腔体侧壁处的一对平板电极对处理介质进行DC加热。假定顶壁和底壁是电绝缘的。空腔的上边界被大气冷却，所有其他壁保持隔热。对于Pr = 1和Pr = 0.1流体，仿真结果表明，流体流量和传热速率与时间无关，并达到稳态。相反，对于Pr = 0.01的流体，发现会发生物理上可实现的周期性振荡流，从而显着影响传热。速度和温度场的这些瞬态特性以图形方式显示。

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