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首页> 外文期刊>Computational thermal sciences >LAMINAR AND TURBULENT OPPOSING MIXED-CONVECTIVE FLOW OVER A VERTICAL PLATE WITH A UNIFORM SURFACE HEAT FLUX
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LAMINAR AND TURBULENT OPPOSING MIXED-CONVECTIVE FLOW OVER A VERTICAL PLATE WITH A UNIFORM SURFACE HEAT FLUX

机译：层流和湍流在具有均匀表面热通量的垂直板上对流混合流动

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摘要

A numerical study of mixed natural and forced convective flow over a thin vertical flat plate which has a uniform surface heat flux has been undertaken. Attention has been restricted to the case where the buoyancy forces act in the opposite direction to the forced flow, i.e., to opposing mixed-convective flow. Laminar, transitional, and turbulent flow situations have been considered and the development of unsteady flow has been allowed for. The forced flow has been assumed to be steady and the Boussinesq approach has been used. The solution has been obtained by numerically solving the governing equations using the commercial CFD solver, ANSYS FLUENT?. The k-epsilon turbulence model with the full effect of buoyancy forces accounted for and with standard wall functions has been used in obtaining the solutions. The heat-transfer rate from the surface of the plate has been expressed in terms of the mean Nusselt number based on the overall plate length and the difference between the overall mean plate temperature and the undisturbed fluid temperature. This Nusselt number depends on the values of the heat flux Rayleigh number based on the plate length, the Reynolds number based on the plate length, and the Prandtl number. Results have been obtained for a Prandtl number of 0.74, i.e., essentially for the value for air. The conditions under which the flow can be assumed to be purely forced convective and under which the flow can be assumed to be purely natural convective, in particular, have been investigated.
机译：已经进行了在具有均匀表面热通量的薄垂直平板上自然和强迫对流混合流动的数值研究。注意力仅限于浮力作用于与强制流动相反的方向的情况，即相反的混合对流。已经考虑了层流，过渡流和湍流情况，并且允许出现不稳定流动。假定强迫流动稳定，并且使用了Boussinesq方法。该解决方案是通过使用商用CFD求解器ANSYS FLUENT？对控制方程进行数值求解而获得的。考虑了浮力的全部作用且具有标准壁函数的kε湍流模型已用于获得解。来自板表面的传热速率已经用基于总板长的平均努塞尔数和总平均板温度与未扰动流体温度之间的差表示。该努塞尔数取决于基于板长的热通量瑞利数，基于板长的雷诺数和普朗特数。对于0.74的普朗特数，即基本上对于空气值，已经获得了结果。特别地，已经研究了可以假定流动为纯强制对流并且可以假定流动为纯自然对流的条件。

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