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首页> 外文期刊>International Journal of Heat and Mass Transfer >Effects of variable properties and non-uniform heating on natural convection flows in vertical channels
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Effects of variable properties and non-uniform heating on natural convection flows in vertical channels

机译：垂直通道中可变特性和加热不均匀对自然对流的影响

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摘要

The effects of variable properties and non-uniform heating on laminar air flows induced by natural convection in vertical channels are investigated numerically. A full-elliptic model which accounts for variations in viscosity and thermal conductivity with temperature and which determines the density from the state equation has been applied to cases in which variable property effects cannot be neglected (including conditions for which flow reversals may occur). The influence of the Rayleigh number and non-uniformity of the wall heat flux distribution on the critical heat per unit time transferred from the walls in symmetric and asymmetric channels is analyzed for a wide range of Rayleigh numbers. It is shown that the maximum wall temperature can be reduced substantially by selecting an appropriate wall heat flux distribution, although at the cost of slightly more restrictive critical conditions.
机译：数值研究了可变性质和不均匀加热对垂直通道中自然对流引起的层流气流的影响。考虑到粘度和导热系数随温度变化并根据状态方程确定密度的全椭圆模型已应用于无法忽略可变特性影响的情况（包括可能发生流动逆转的条件）。对于大范围的瑞利数，分析了瑞利数和壁热通量分布的不均匀性对从壁在对称和不对称通道中传递的每单位时间的临界热量的影响。结果表明，通过选择合适的壁热通量分布可以最大程度地降低最大壁温，尽管要以限制性条件更为严格为代价。

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