Analysis of Radiation-Ind uced Natural Convection in Rectangular Enclosures
Analysis of Radiation-Ind uced Natural Convection in Rectangular Enclosures
复制标题
矩形外壳内辐射引起的自然对流分析
DOI：
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发表时间：
1987
期刊：
影响因子：
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通讯作者：
R. Viskantaf
中科院分区：
文献类型：
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作者：
B. W. Webb;R. Viskantaf
本文建立了一个模型，用于预测垂直流体层中外源辐射能的体积沉积率以及随后的浮力驱动的流动和传热。该模型要求耦合的二维方程的连续性，动量和能量的一维辐射传输模型的解决方案。经过实验验证的模型，进行参数计算，以确定修改后的瑞利数，流体普朗特数，流体层的不透明度，腔体的纵横比，不透明的壁反射率，和对流热损失从传输壁的效果。自然对流运动和热传递与侧壁温差加热的空腔中的情况大不相同。结果以温度分布、局部热传递、流函数等值线和预测的辐射通量发散廓线的形式呈现。
A model has been developed for predicting the volumetric deposition rate of radiant energy from an external source in a vertical fluid layer and the subsequent buoyancy-driven flow and heat transfer. The model calls for solution of the coupled two-dimensional equations of continuity, momentum, and energy with a onedimensional radiative transfer model. After experimental validation of the model, parametric calculations were performed to determine the effect of the modified Rayleigh number, fluid Prandtl number, fluid layer opacity, cavity aspect ratio, opaque wall reflectivity, and convective heat loss from the transmitting wall. Natural convective motion and heat transfer are quite different from that found in cavities with differentially heated side walls. Results are presented in the form of temperature distributions, local heat transfer, contours of the stream function, and profiles of the predicted radiative flux divergence.