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首页> 外文期刊>International Journal of Heat and Mass Transfer >Effect Of Vent Aspect Ratio On Unsteady Laminar Buoyant Flow Through Rectangular Vents In Large Enclosures
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Effect Of Vent Aspect Ratio On Unsteady Laminar Buoyant Flow Through Rectangular Vents In Large Enclosures

机译：通风孔纵横比对矩形围护结构中非恒定层流通过矩形通风孔的影响

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摘要

The effects of vent aspect ratio on oscillatory flow regime through a horizontal opening were studied numerically. The physical model consisted of a vertical rectangular enclosure divided into two chambers by a horizontal partition. The partitions contained a slot that connected the two chambers. The upper chamber contains cold air and the lower chamber contains hot air. A density differential due to the different temperatures drives the interaction between the two chambers. The opposing forces at the interface between the two chambers create a gravitationally unstable system, and an oscillating exchange of fluid develops. Results were obtained for cases with L/D = 1, 0.5, and 2.0, where L represents the thickness of the partition and D represents the slot width of the opening in the partition. Results indicate that the flow exchange increases with partition thickness L/D = 0.5 and decreases for L/D = 2. The frequency of the oscillatory flow pattern is also examined for the different cases. Sudden bursts of upflow with a corresponding downflow have been documented and compared with experimental observations in the literature. The time traces of velocity and temperature fields for this flow regime reveal interesting mechanisms, which have been explained.
机译：数值研究了通气口纵横比对通过水平开口的振荡流动状态的影响。物理模型由一个垂直的矩形外壳组成，该外壳由一个水平隔板分成两个腔室。隔板包含一个连接两个腔室的插槽。上部腔室容纳冷空气，下部腔室容纳热空气。由于温度不同而引起的密度差驱动了两个腔室之间的相互作用。在两个腔室之间的界面处的相反力产生了重力不稳定的系统，并且形成了振荡的流体交换。对于L / D = 1、0.5和2.0的情况，获得了结果，其中L表示隔板的厚度，D表示隔板中开口的缝隙宽度。结果表明，流动交换随着分隔壁厚度L / D = 0.5的增加而增加，而在L / D = 2的情况下减小。在不同情况下，还检查了振荡流动模式的频率。已经记录了突然爆发的上冲和相应的下冲，并与文献中的实验观察结果进行了比较。该流态的速度和温度场的时间轨迹揭示了有趣的机理，这些机理已得到解释。

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