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首页> 外文期刊>International Journal of Heat Exchangers >Flow Visualization Inside the Wavy Channels
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Flow Visualization Inside the Wavy Channels

机译：波浪通道内的流可视化

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摘要

This study presents visual observation and frictional performance of the wavy channels. A total of three test sections including two wavy channels with corrugation angle of 15 and 30 degrees and a plain channel were examined in this study. The observed range is from Re = 300 to Re = 2100. A detectable flow re-circulation is seen at the leeside of the wavy channel for θ = 30° and Re = 300. This phenomenon is seen even in the first corrugation of the 30° wavy channel but is not seen for 15° corrugation channel. As the Reynolds number is increased to 500, the flow field for θ = 30° is quite unsteady and shedding transverse vortices are seen at the leeward portion of the corrugation channel. A very special phenomenon of the split and turn around of the dye streak located at the leeward of the second corrugation is observed. This phenomenon is also seen at the corrugation angle of θ = 15° and Re = 1000. The pressure drops of the wavy channels increase significantly with the corrugation angles. The pronounced increase of the pressure drop of the wavy channel is directly linked to the presence of flow-recirculation and the strong turbulent mixing caused by the corrugation.
机译：这项研究提出了视觉观察和波浪通道的摩擦性能。这项研究共检查了三个测试部分，包括两个波纹角分别为15度和30度的波浪形通道和一个平坦通道。观察到的范围是从Re = 300到Re =2100。对于θ= 30°和Re = 300，在波浪通道的背侧可以看到可检测到的气流再循环。即使在30瓦楞的第一个波纹中也可以看到这种现象。 °波浪形通道，但看不到15°波纹形通道。当雷诺数增加到500时，θ= 30°时的流场变得非常不稳定，并且在波纹通道的背风部分看到了横向涡旋脱落。观察到一个非常特殊的现象，即位于第二个波纹的背风处的染料条纹发生裂开和转弯。在θ= 15°和Re = 1000的波纹角处也可以看到这种现象。波浪形通道的压降随波纹角而显着增加。波浪形通道的压降的显着增加与波纹形成的流动再循环和强烈的湍流混合直接相关。

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