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Combined mixed convection and radiation simulation of inclined lid driven cavity

机译：斜盖驱动腔混合对流与辐射混合模拟

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This paper presents a numerical investigation of the laminar mixed convection flow of a radiating gas in an inclined lid-driven cavity. The fluid is treated as a gray, absorbing, emitting, and scattering medium. The governing differential equations including continuity, momentum and energy are solved numerically by the computational fluid dynamics techniques (CFD) to obtain the velocity and temperature fields. The discretized forms of these equations are obtained by the finite volume method and solved by using the SIMPLE algorithm. Since the gas is considered as a radiating medium, besides convection and conduction heat transfer, radiation also takes place in the gas flow. For computing the radiative term in the gas energy equation, the radiative transfer equation (RTE) is solved numerically by the discrete ordinate method (DOM). The streamline and isotherm plots and the distributions of convective, radiative and total Nusselt numbers along the bottom wall of the cavity are presented. In this work, an attempt is made to investigate the hydrodynamic and thermal behavior of the mixed convection flow of a radiating gas at different values of the cavity inclination angle. The numerical results reveal that the variation of inclination angle causes a sweep behavior in the flow pattern inside the cavity. Besides, it is found that the value of radiative Nusselt number along the heated wall has a decreasing trend when the medium optical thickness is increases. Comparisons between the present numerical results with those obtained by other investigators in the cases of conduction-radiation and pure convection systems show good consistencies.
机译：本文对倾斜盖驱动腔中辐射气体的层流混合对流进行了数值研究。流体被视为灰色，吸收，发射和散射的介质。通过计算流体动力学技术（CFD）对包括连续性，动量和能量在内的控制微分方程进行数值求解，以获得速度和温度场。这些方程的离散形式通过有限体积法获得，并通过使用SIMPLE算法求解。因为气体被认为是辐射介质，所以除了对流和传导热传递外，气体流中还会发生辐射。为了计算气体能量方程中的辐射项，通过离散纵坐标法（DOM）数值求解辐射传递方程（RTE）。给出了沿腔体底壁的流线图和等温线图以及对流，辐射和总努塞尔数的分布。在这项工作中，试图研究在腔体倾角不同的情况下，辐射气体混合对流的流体动力学和热行为。数值结果表明，倾斜角的变化会引起腔体内流型的扫掠行为。此外，发现当中等光学厚度增加时，沿着加热壁的辐射努塞尔数的值具有减小的趋势。在传导辐射和纯对流系统的情况下，当前数值结果与其他研究者获得的数值结果之间的比较显示出良好的一致性。

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