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首页> 外文期刊>International Journal of Heat and Mass Transfer >Thermal performances of parallelogram channels with skewed ribs and tilted three dimensional fillets
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Thermal performances of parallelogram channels with skewed ribs and tilted three dimensional fillets

机译：具有倾斜肋和倾斜的三维角的平行四边形通道的热性能

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摘要

Thermal performance improvements for ribbed channels are attempted by installing auxiliary fillets on ribbed endwalls. Detailed heat transfer distributions over two opposite endwalls enhanced by 45° ribs and a row of tilted three-dimensional fillets of 1/2 rib heights with streamlined shape are measured at five flow configurations using steady-state infrared thermography method. Local, area-averaged and channel-averaged Nusselt numbers (Nu, Nu and Nu), Fanning friction factors (f) and thermal performance factors (TPF) for each test channel are examined with Reynolds number (Re) in the range of 5000-15,000. The HTE properties and associated f augmentations for the compound HTE measures are assessed by comparing the Nu and f data detected from present test channels with the Nusselt numbers (Nu_∞) and f factors (f_∞) of smooth plain tube. Empirical correlations evaluating Nu and f factors for present ribbed channels with/without in-lined/staggered fillets are generated. With present in-lined (staggered) fillets on two opposite ribbed endwalls, the HTE ratios in terms of Nu/Nu_∞ are raised to 4.43-4.21 (3.85-4.05) with forward flows and 431-4.02 (4.14-4.06) with backward flows at 5000 ≤ Re ≤ 15,000; whereas the corresponding f/f_∞ ratios and TPF values fall in the respective ranges of 6.5-3.35 and 7.3-3.6 (7.5-5.6 and 9.06-7.39) with forward flows and 2.37-2.81 and 2.22-2.62 (1.97-2.29 and 1.99-2.09) with backward flows. As the Nu/Nu_∞, f/f_∞ and TPF values for present ribbed channels with in-lined/staggered fillets are generally raised from the ribbed channel counterparts of 3.93-3.61 (Nu/ Nu_∞), 1.63-1.53 (f/f_∞) and 2.41-2.35 (TPF), the improved thermal performances by fitting the tilted fillets to enhance the rib-induced vortical flows are demonstrated.
机译：试图通过在肋端壁上安装辅助圆角来改善肋通道的热性能。使用稳态红外热成像方法在五个流动配置下测量了两个相对的端壁的详细传热分布，这些相对的端壁由45°肋骨增强，并有一排具有1/2肋骨高度的倾斜三维角，具有流线型形状。使用每个测试通道的雷诺数（Re）检查每个测试通道的局部，面积平均和通道平均努塞尔数（Nu，Nu和Nu），扇形摩擦系数（f）和热性能系数（TPF）。 15,000通过比较从当前测试通道检测到的Nu和f数据与光滑平管的Nusselt数（Nu_∞）和f因子（f_∞），可以评估复合HTE措施的HTE属性和相关的f增大。生成了经验相关性，该经验相关性评估了当前肋状通道（带有/不带有内嵌/交错圆角）的Nu和f因子。在两个相对的肋端壁上均存在内嵌（交错）圆角的情况下，向前流动时，Hu的Nu /Nu_∞比率提高到4.43-4.21（3.85-4.05），而向后时则升高到431-4.02（4.14-4.06） 5000≤Re≤15,000时的流量;而相应的f /f_∞比和TPF值分别在向前流动时分别在6.5-3.35和7.3-3.6（7.5-5.6和9.06-7.39）和2.37-2.81和2.22-2.62（1.97-2.29和1.99）范围内-2.09）。由于当前带有肋排/交错圆角的肋状通道的Nu /Nu_∞，f /f_∞和TPF值通常从3.93-3.61（Nu /Nu_∞），1.63-1.53​​（f / f_∞）和2.41-2.35（TPF），通过安装倾斜的圆角以增强肋骨引起的涡流，改善了热性能。

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