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首页> 外文期刊>International Journal of Heat and Mass Transfer >Laminar natural convection in a vertical stack of parallelogrammic partial enclosures with variable geometry
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Laminar natural convection in a vertical stack of parallelogrammic partial enclosures with variable geometry

机译：具有可变几何形状的平行四边形局部罩的垂直堆叠中的层流自然对流

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摘要

A numerical study is conducted for laminar natural convection heat transfer occurring in a vertical stack of parallelogrammic partial enclosures. The partitions separating adjacent enclosures are always parallel to each other, however their angle relative to the horizontal can change. The length of each partition is less than the width of the main enclosure, which has an aspect ratio of 5. Adjacent enclosures are thermally linked through the fluid exchange, and through the finite thermal conductivity of the partitions. The thermal diode effect offered by the geometry is analyzed in terms of the partitions' inclination angle and materials for different thermal boundary conditions/operating conditions. The thermal diode effect, and even its actuating direction, can be changed by changing the inclination angle of the partitions. The main focus of the present work deals with the heat transfer analysis based on the overall Nusselt number, and the visualization of the flow field and heat transfer mechanisms, by using the isotherms, the streamlines and the heatlines. Results clearly indicate the high potential of this configuration, based on the thermal diode effect, to be used as an effective heat transfer device in real situations of thermal engineering. The number of governing parameters is high, and the results are presented only for situations selected on the basis of their relevance. For computational expediency, it is analyzed the solution obtained for one single parallelogrammic partial enclosure of the stack, which is thermally linked with its adjacent enclosures by using vertical cyclic boundary conditions. This procedure has some potential, since it yields results with good accuracy to predict the overall thermal behavior of the stack.
机译：对平行四边形部分围墙的垂直堆叠中发生的层流自然对流传热进行了数值研究。分隔相邻机柜的隔板始终彼此平行，但是它们相对于水平面的角度可以改变。每个隔板的长度小于主外壳的宽度，该主外壳的纵横比为5。相邻的外壳通过流体交换和隔板的有限导热性进行热连接。根据隔板的倾斜角度和不同热边界条件/工作条件的材料，分析了由几何形状提供的热二极管效应。可以通过改变隔壁的倾斜角度来改变热敏二极管的作用，甚至其作用方向。本工作的主要重点是基于等温线，流线和热线，基于总的Nusselt数进行传热分析，以及流场和传热机制的可视化。结果清楚地表明，基于热二极管效应，这种配置具有很高的潜力，可以在热工学的实际情况下用作有效的传热设备。控制参数的数量很多，并且仅针对根据其相关性选择的情况显示结果。为了便于计算，分析了堆栈的一个平行四边形部分封闭所获得的解决方案，该局部封闭通过使用垂直循环边界条件与其相邻的封闭空间热链接。该程序具有一定的潜力，因为它产生的结果具有很高的准确性，可以预测电池组的整体热性能。

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