Variable Property Effects in Laminar Natural Convection in a Square Enclosure
Variable Property Effects in Laminar Natural Convection in a Square Enclosure
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DOI：
10.1115/1.3247369
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发表时间：
1985-02
影响因子：
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通讯作者：
Z. Zhong;Kwang-tzu Yang;J. Lloyd
中科院分区：
文献类型：
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作者：
Z. Zhong;Kwang-tzu Yang;J. Lloyd
采用数值有限差分方法研究了不同参数对差热二维正方形封闭腔内温度场、速度场和换热速率的影响。计算的瑞利数范围为10~6，温差比θ0=(Th-TC)/Tc分别为0.2、0.5、1.0和2.0，其中Th和Tc分别为冷壁和热壁温度。已解决的具体问题包括Boussinesq近似的有效性限制、参考温度的正确使用、热传递速率的可变性质关联以及以传导为主的区域的限制。
A numerical, finite-difference study has been carried out to determine the effects of variable properties on the temperature and velocity fields and the heat transfer rate in a differentially heated, two-dimensional square enclosure. Calculations have been done for a Rayleigh number range up to 106 , and temperature difference ratios θ0 = (TH –TC ) / TC of 0.2, 0.5, 1.0, and 2.0, where TH and TC are the hot and cold wall temperatures, respectively. Specific issues that have been addressed are the limits of validity of the Boussinesq approximation, the proper use of a reference temperature, variable property correlation of the heat transfer rate, and the limits of conduction-dominated regions.