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首页> 外文期刊>International Journal of Heat and Mass Transfer >An experimental investigation of flow and heat transfer characteristics over blocked surfaces in laminar and turbulent flows
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An experimental investigation of flow and heat transfer characteristics over blocked surfaces in laminar and turbulent flows

机译：层流和湍流中阻塞表面的流动和传热特性的实验研究

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摘要

Flow and heat transfer measurements were obtained over a blocked surface mounted on a low speed wind tunnel in order to investigate the combined the effects of free stream velocities and the different size of rectangular blocks on the flow and heat transfer characteristics. Mean velocity and turbulence intensities were measured by a constant temperature anemometer and wall temperatures by copper-constant thermocouple and static pressures by a micro-manometer, respectively. It was found that the flow separations and reattachments were occurred before the first blocks, on the first blocks, between blocks and after the last blocks. The blocked surface area and flow separation caused not only heat transfer enhancement but higher turbulence levels as well. The average Stanton numbers, for block heights of 10,15 and 20 mm, were higher than those of fiat surface by 82%, 95%, 113% in laminar and 27%, 38%, 50% in turbulent, respectively. These results showed that heat transfer enhancement on the blocked surface increased with block heights and become more pronounced in laminar than that of turbulent flows.
机译：为了研究自由流速度和矩形块的不同尺寸对流动和传热特性的综合影响，在安装在低速风洞上的阻塞表面上获得了流动和传热的测量结果。平均速度和湍流强度分别通过恒温风速计和壁温通过铜恒定热电偶测量，静压力通过微压力计测量。发现在第一块之前，第一块上，各块之间以及最后一块之后发生了流分离和重新附着。堵塞的表面积和流动分离不仅导致传热增强，而且还引起更高的湍流度。块高为10,15和20 mm时，平均Stanton数分别比平整表面高82％，层流95％，113％和湍流27％，38％，50％。这些结果表明，在受阻表面上的传热增强随着受阻高度的增加而增加，并且在层流中比湍流更明显。

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