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首页> 外文期刊>Building and Environment >Effect of heat source aspect ratio on turbulent thermal stratification in a naturally ventilated enclosure
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Effect of heat source aspect ratio on turbulent thermal stratification in a naturally ventilated enclosure

机译：热源长宽比对自然通风罩中湍流热分层的影响

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摘要

The turbulent buoyant flows generated from a heat source block in a naturally ventilated cubical enclosure with vertical and horizontal openings are numerically investigated. Turbulence is modeled with large eddy simulation (LES) and the filtered governing equations are solved using an in-house code based on finite difference method (FDM). The time dependent flow characteristics are analyzed by varying the heat source aspect ratio (phi) in the range 0.25 = phi = 4.0 and the Grashof numbers (Gr) are varied between 10(7) = Gr = 10(11). A chaotic flow behavior is observed inside the enclosure and the bidirectional exchange across the openings increases linearly with Grashof number. The results indicate that the heat source aspect ratio significantly impacts the thermal buoyancy force with the formation of multi-recirculating vortex cells inside the enclosure. A significant enhancement in the heat transfer rate and mass flow rates are observed after increasing the heat source aspect ratio. The results also indicate that the flow instabilities that develop across the vertical opening exceeded those across the horizontal opening. The present numerical results are in good agreement with the benchmark results reported in literature.
机译：数值研究了自然通风的立方外壳中由热源模块产生的湍流浮力流。用大涡模拟（LES）对湍流建模，并使用基于有限差分法（FDM）的内部代码求解滤波后的控制方程。通过在0.25 <= phi <= 4.0范围内改变热源长宽比（phi）来分析随时间变化的流动特性，并且Grashof值（Gr）在10（7）<= Gr <= 10（11）之间变化。在外壳内部观察到混乱的流动行为，并且跨开口的双向交换随格拉斯霍夫数线性增加。结果表明，热源的长宽比显着影响了热浮力，并在外壳内部形成了多个循环涡流单元。在增加热源长宽比之后，可以观察到传热速率和质量流量的显着提高。结果还表明，垂直开口处的流动不稳定性超过了水平开口处的不流动。目前的数值结果与文献报道的基准结果吻合良好。

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