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首页> 外文期刊>Journal of Heat Transfer >A Numerical Simulation of Combined Radiation and Natural Convection in a Differential Heated Cubic Cavity
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A Numerical Simulation of Combined Radiation and Natural Convection in a Differential Heated Cubic Cavity

机译：立方加热腔中辐射与自然对流耦合的数值模拟。

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摘要

This article presents a numerical simulation of combined radiation and natural convection in a three-dimensional differentially heated rectangular cavity with two opposite side walls kept at a temperature ratio T_h/T_c=2.0 and T_c=500 K, with others walls insulated. A non-Boussinesq variable density approach is used to incorporate density changes due to temperature variation. The Navier-Stokes (NSE), temperature, as well as the radiative transfer (RTE) equations are solved numerically by a finite volume method, with constant thermophysical fluid properties (except density) for Rayleigh number Ra = 10~5 and Prandtl number Pr = 0.71. The convective, radiative, and total heat transfer on the isothermal and adiabatic walls is studied along with the flow phenomena. The results reveal an extraordinarily complex flow field, wherein, along with the main flow, many secondary flow regions and singular points exist at the different planes and are affected by the optical properties of the fluid. The heat transfer decreases with increase in optical thickness and the pure convection Nusselt number is approached as the optical thickness τ> 100, but with substantially different velocity field. The wall emissivity has a strong influence on the heat transfer but the scattering albedo does not.
机译：本文提供了三维差分加热矩形腔体中辐射与自然对流组合的数值模拟，该腔体的两个相对的侧壁保持在温度比T_h / T_c = 2.0和T_c = 500 K，并且其他壁都隔热。非Boussinesq可变密度方法用于合并由于温度变化引起的密度变化。通过有限体积法对数值的Navier-Stokes（NSE），温度以及辐射传递（RTE）方程进行数值求解，其中瑞利数Ra = 10〜5和普朗特数Pr具有恒定的热物理流体性质（密度除外） = 0.71。研究了等温壁和绝热壁上的对流，辐射和总热传递以及流动现象。结果揭示了一个异常复杂的流场，其中，与主流一起，许多次流区域和奇异点存在于不同的平面上，并受流体的光学特性影响。传热随着光学厚度的增加而降低，纯对流努塞尔数接近光学厚度τ> 100，但速度场却大不相同。壁的发射率对传热有很大影响，但散射反照率则没有。

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