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Thermal Characteristics in a Tube With Loose-Fit Perforated Twisted Tapes

机译：松配合多孔穿孔带管的热特性

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摘要

Enhanced heat transfer and pressure loss in a tube with loose-fit perforated twisted tapes were experimentally investigated. The effects of the twist ratio and the hole diameter ratio were also described. A constant twisted tape width of 52 mm, which is lower than the tube inside diameter of 56 mm, was used in order to reduce excessive pressure drops associated with full-width twisted tape elements. The tests were conducted using the tapes with three different ratios of pitch length of twisted tape to inner diameter of tube (twist ratios = 2, 2.5, 3) and three different ratios of hole to inner diameter (diameter ratios = 0.0714, 0.107, 0.143) in a range of Reynolds number 4860 to 24, 130 under uniform heat flux conditions. The experimental findings revealed that the Nusselt number, friction factor, and thermal performance factor increase with decreasing twist ratio and hole diameter ratio. The maximum value of thermal performance factor of 1.27 was achieved for the case at a twist ratio of 2 and a hole diameter ratio of 0.0714. Eventually, the experimental results of Nusselt number, friction factor and thermal performance factor were correlated, and the deviations determined for Nusselt number, friction factor, and thermal performance factor were within ±7%, ±8%, and ±6%, respectively.
机译：实验研究了在带有松配合穿孔扭曲带的管中增强的传热和压力损失。还描述了扭曲比和孔径比的影响。为了减小与全幅扭曲带元件相关的过大的压降，使用了52 mm的恒定扭曲带宽度，该宽度小于管内径56 mm。使用具有三种不同扭绞带的节距长度与管内径的比率（扭转比= 2、2.5、3）和三种不同的孔与内径的比率（直径比= 0.0714、0.107、0.143）的胶带进行测试）在均匀热通量条件下的雷诺数为4860至24、130的范围内。实验结果表明，随着扭转比和孔直径比的减小，Nusselt数，摩擦因数和热性能因数增加。对于这种情况，在扭曲比为2且孔径比为0.0714的情况下，热性能系数的最大值为1.27。最终，将Nusselt数，摩擦系数和热性能系数的实验结果进行了关联，确定的Nusselt数，摩擦系数和热性能系数的偏差分别在±7％，±8％和±6％之内。

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  • 来源
    《Heat Transfer Engineering》 |2015年第18期|1504-1517|共14页
  • 作者

    SIBEL GUNES; ERSIN KARAKAYA;

  • 作者单位

    Department of Mechanical Engineering, Erciyes University, Kayseri 38039, Turkey;

    Department of Mechanical Engineering, Erciyes University, Kayseri, Turkey;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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  • 正文语种 eng
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