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首页> 外文期刊>Experimental Thermal and Fluid Science: International Journal of Experimental Heat Transfer, Thermodynamics, and Fluid Mechanics >Forced convective heat transfer of 45 degrees rib-roughened fin flows
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Forced convective heat transfer of 45 degrees rib-roughened fin flows

机译：45度肋肋翅片流的强制对流换热

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摘要

The detailed heat transfer measurements in three side-open and bottom-sealed rectangular channels with two opposite walls roughened by 45 degrees full staggered ribs were performed using the infrared radiometer. The present flow configuration simulated an enhanced coolant channel of the fin-type heat-sinks for cooling of electronic chipsets. The hydraulic diameter of three test channels was 14.8 mm with different length-to-gap (L/B) ratios of 21.33, 17.11 and 13.56. The influences of L/B ratio on the local and spatially averaged heat transfers over the rib-roughened surface at Reynolds numbers (Re) of 500, 1000, 2000, 3000 and 3300 were examined. A selection of heat transfer results illustrated the interactive effects between the side-profile leakage-flow and the rib-induced flow phenomena, which were L/B ratio dependent. Heat transfer levels over the rib-roughened surface consistently increased with the increase of Reynolds number or the decrease of L/B ratio. The skewed streamwise "saw-tooth" heat transfer variations gradually emerged over the rib-roughened surface when the Reynolds number systematically increased. Comparing with the heat transfers in the likewise channels but roughened by 90 degrees staggered ribs, the 45 degrees staggered ribs could further enhance heat transfers over 10% for L/B = 21.33 and 50% for L/B = 13.56. Heat transfer correlation for the spatially averaged Nusselt number over a rib-roughened fin surface was generated using Re and L/B ratio as the controlling parameters. A criterion for determining the optimal L/B ratio that could provide the maximum cooling power over a rib-roughened fin surface was subsequently derived to aid the design tools for the heat-sink selection. (c) 2005 Elsevier Inc. All rights reserved.
机译：使用红外辐射计在三个侧面开口和底部密封的矩形通道中进行了详细的传热测量，两个相对的壁壁均被45度全交错肋粗​​化。当前的流动配置模拟了用于电子芯片组冷却的翅片型散热器的增强冷却剂通道。三个测试通道的水力直径为14.8毫米，长宽比（L / B）为21.33、17.11和13.56。考察了L / B比对在500、1000、2000、3000和3300的雷诺数（Re）时肋骨粗糙表面上局部和空间平均传热的影响。传热结果的选择说明了侧面轮廓泄漏流和肋骨引起的流动现象之间的相互作用，这取决于L / B比。随着雷诺数的增加或L / B比的降低，肋粗糙表面上的传热水平持续增加。当雷诺数系统地增加时，偏斜的流向“锯齿”传热变化逐渐在肋粗化的表面上出现。与同样通道中的传热相比，但通过90度交错的肋进行了粗化处理，45度交错的肋可以进一步提高热传递，L / B = 21.33时超过10％，L / B = 13.56时超过50％。使用Re和L / B比作为控制参数，生成肋肋粗糙化的翅片表面上空间平均Nusselt数的传热相关性。随后推导了确定最佳L / B比的标准，该标准可在加筋的肋片表面上提供最大的冷却功率，以帮助散热片选择的设计工具。 （c）2005 Elsevier Inc.保留所有权利。

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