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首页> 外文期刊>International Communications in Heat and Mass Transfer >Study on thermal and fluid flow characteristics in turbulent channel flows with multiple twisted tape vortex generators
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Study on thermal and fluid flow characteristics in turbulent channel flows with multiple twisted tape vortex generators

机译：用多条扭曲带状涡流发生器研究湍流通道中的热和流体流动特性

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This research has been performed to study the influences of multiple twisted tape vortex generators (MT-VC) on the heat transfer and fluid friction characteristics in a rectangular channel. The experiments conducted using the twisted tapes with three different twist ratios (y/w = 2.5,3.0 and 3.5) for generating different swirl and turbulent intensities in the channel. The twisted tapes are assembled to obtained the MT-VC with three different free-spacing ratios, s/w = 1.66 (5 tapes), s/w = 1.25 (7 tapes) and s/w = 1.0 (9 tapes). The results for the Reynolds number ranged from 2700 to 9000 at constant Prandtl number, Pr = 0.7, using air as the test fluid, are examined. In the studied range, the presence of channel with MT-VC leads to increase in heat transfer rate over the use of smooth channel around 10.3 to 169.5%. The channel with the smaller twist ratio (y/w) and free-spacing ratio (s/w) provides higher heat transfer rate and pressure loss than those with the larger of twist ratio and free-spacing ratio under similar operation conditions. In addition, correlations of Nusselt number (Nu) and friction factor (f) have been developed and the thermal enhancement index at constant pumping power is also determined.
机译：进行了这项研究，以研究多个扭曲的带状涡流发生器（MT-VC）对矩形通道内的传热和流体摩擦特性的影响。使用具有三种不同扭曲比（y / w = 2.5、3.0和3.5）的扭曲带进行的实验，以在通道中产生不同的涡流和湍流强度。组装扭曲的磁带，以获得具有三种不同自由间距比的s-w = 1.66（5根磁带），s / w = 1.25（7根磁带）和s / w = 1.0（9根磁带）。使用空气作为测试液，在恒定的普朗特数Pr = 0.7时，检查了雷诺数在2700至9000之间的结果。在所研究的范围内，具有MT-VC的通道的存在会导致导热率的增加超过使用光滑通道的10.3至169.5％。在类似的操作条件下，与具有较大扭曲比和自由间距比的通道相比，具有较小扭曲比（y / w）和自由间距比（s / w）的通道提供更高的传热速率和压力损失。此外，已经开发出努塞尔数（Nu）和摩擦系数（f）的相关性，并且还确定了恒定泵浦功率下的热增强指数。

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