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首页> 外文期刊>Journal of visualization >Flow Visualization and Local Mass Transfer Studies for Turbulent Flow in a Wind Tunnel with Chamfered Ribs
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Flow Visualization and Local Mass Transfer Studies for Turbulent Flow in a Wind Tunnel with Chamfered Ribs

机译：带倒角肋的风洞中湍流的流动可视化和局部传质研究

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摘要

The paper presents results of flow visualization and mass transfer studies for fully developed turbulent flow of air in a square section wind tunnel with repeated chamfered rib roughness on the bottom of the tunnel (rib head chamfer angles φ of -15°, 0°, and 15°; relative roughness pitch p/e = 3, 5, 7.5, and 10). Direct video recordings of flow patterns were made using a simple technique of particles visualization. For the positively chamfered closely spaced ribs (p/e ≤ 5) vigorous vortex shedding has been seen compared to the square or negatively chamfered ribs, which is found to be a function of the Reynolds number. For the widely spaced ribs, the study shows flow separation at the ribs and reattachment in the inter-rib region. Local mass transfer studies, based on the variation in colour of cobaltous chloride solution impregnated paper due to evaporation of water, showed a significant improvement in mass transfer rate in the recirculating region in the wake of ribs with the change in the chamfer angle from -15° to 15°. The positively chamfered 15° ribs are found to be better than square section ribs at p/e ≤ 7.5. The performance of negatively chamfered ribs is found to be poor compared to other ribs irrespective of the relative roughness pitch.
机译：本文介绍了在方形截面风洞中充分发展的湍流气流的流动可视化和传质研究的结果，该风洞底部反复出现肋状的倒角肋（肋头倒角角度-15°，0°和15°；相对粗糙度间距p / e = 3、5、7.5和10）。使用简单的粒子可视化技术直接记录了流动模式。对于正斜切的小间距肋（p / e≤5），与方形或负斜切的肋相比，剧烈的涡旋脱落已被发现，这是雷诺数的函数。对于间距较大的肋骨，研究显示肋骨处的流动分离和肋间区域的重新附着。基于水分蒸发导致氯化钴溶液浸渍纸的颜色变化而进行的局部传质研究表明，随着肋的倒角从-15改变，肋骨尾部的再循环区域的传质速率有了显着改善。 °至15°。发现在p / e≤7.5时，正斜切的15°肋比方形截面肋更好。与其他肋相比，无论相对粗糙度间距如何，负倒角肋的性能都较差。

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