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首页> 外文期刊>Experimental Heat Transfer >EXPERIMENTAL STUDY ON EVAPORATIVE HEAT TRANSFER AND PRESSURE DROP OF R-134a FLOWING DOWNWARD THROUGH VERTICAL CORRUGATED TUBES WITH DIFFERENT CORRUGATION PITCHES
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EXPERIMENTAL STUDY ON EVAPORATIVE HEAT TRANSFER AND PRESSURE DROP OF R-134a FLOWING DOWNWARD THROUGH VERTICAL CORRUGATED TUBES WITH DIFFERENT CORRUGATION PITCHES

机译：R-134a垂直通过带有不同波纹孔的波纹管向下流动的蒸发传热和压降的实验研究

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摘要

This study reports an experimental investigation of evaporative heat transfer and pressure drop of R-134a flowing downward inside vertical corrugated tubes with different corrugation pitches. The double tube test section is 0.5 m long with refrigerant flowing in the inner tube and hot water flowing in the annulus. The inner tubes are comprised of one smooth tube and three corrugated tubes with different corrugation pitches of 6.35, 8.46, and 12.7 mm. The test runs are performed at evaporating temperatures of 10℃, 15℃, and 20℃; heat fluxes of 20, 25, and 30 kW/m~2; and mass fluxes of 200,300, and 400 kg/m~2s. The experimental data obtained from the smooth tube are plotted with flow pattern map for vertical flow. Comparisons between smooth and corrugated tubes on the heat transfer and pressure drop are also discussed. It is observed that the heat transfer coefficient and frictional pressure drop obtained from the corrugated tubes are higher than those from the smooth tube. Furthermore, the heat transfer coefficient and frictional pressure drop increase as the corrugation pitch decreases. The maximum heat transfer enhancement factor and penalty factor are up to 1.22 and 4.0, respectively.
机译：这项研究报告了对R-134a在不同波纹节距的垂直波纹管内向下流动的蒸发传热和压降的实验研究。双管测试段的长度为0.5 m，制冷剂在内管中流动，热水在环形空间中流动。内管由一根平滑管和三根波纹管组成，它们的波纹节距分别为6.35、8.46和12.7 mm。试验运行在10℃，15℃和20℃的蒸发温度下进行。 20、25和30 kW / m〜2的热通量;质量通量为200,300和400 kg / m〜2s。从光滑管获得的实验数据与垂直方向的流型图一起绘制。还讨论了光滑管和波纹管之间的传热和压降比较。可以看出，从波纹管获得的传热系数和摩擦压降高于从光滑管获得的传热系数和摩擦压降。此外，随着波纹节距的减小，传热系数和摩擦压降增加。最大传热增强因子和损失因子分别高达1.22和4.0。

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  • 来源
    《Experimental Heat Transfer》 |2013年第5期|41-63|共23页
  • 作者

    K. Aroonrat; A. S. Dalkilic; S. Wongwises;

  • 作者单位

    Fluid Mechanics, Thermal Engineering and Multiphase Flow Research Lab (FUTURE), Department of Mechanical Engineering, Faculty of Engineering,King Mongkut's University of Technology Thonburi, Bangmod, Bangkok,Thailand;

    Heat and Thermodynamics Division, Department of Mechanical Engineering,Yildiz Technical University (YTU), Yildiz, Besiktas, Istanbul, Turkey;

    Fluid Mechanics, Thermal Engineering and Multiphase Flow Research Lab (FUTURE), Department of Mechanical Engineering, Faculty of Engineering,King Mongkut's University of Technology Thonburi, Bangmod, Bangkok,Thailand ,The Academy of Science, The Royal Institute of Thailand, Sanam Suea Pa,Dusit, Bangkok, Thailand Department of Mechanical Engineering, Faculty of Engineering, King Mongkut's University of Technology Thonburi, 126 Pracha-utid Road, Bangmod, Bangkok 10140, Thailand;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    vertical; evaporative; heat transfer; pressure drop; corrugated tube;

    机译：垂直;蒸发;传热;压降;波纹管;

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