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首页> 外文期刊>International Journal of Heat and Mass Transfer >An experimental investigation of flow boiling heat transfer and pressure drop of R134a in a horizontal 2.168 mm tube under hypergravity. Part Ⅱ: Heat transfer coefficient
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An experimental investigation of flow boiling heat transfer and pressure drop of R134a in a horizontal 2.168 mm tube under hypergravity. Part Ⅱ: Heat transfer coefficient

机译：超重力下水平2.168 mm管中R134a的流沸腾传热和压降的实验研究。第二部分：传热系数

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摘要

An experimental study on flow boiling of R134a under hypergravity is conducted for assessing the effect of gravity on two-phase flow boiling heat transfer coefficient. The experiments were conducted with a horizontal smooth copper tube with an inner diameter of 2.168 mm under both hypergravity (1.12-3.16 g) and normal gravity (1 g), with mass flux of 725 and 910 kg/m~2 s, heat flux of 19.0 and 28.5 kW/ m~2, saturation pressure of 0.71 and 0.82 MPa (saturation temperature of 27.2 and 32.2 ℃), and vapor quality from 0 to 0.65. The hypergravity environment was generated with a centrifugal acceleration machine. The experimental data under hypergravity are compared with those under normal gravity and with the predictions of 11 outstanding existing correlations developed for normal gravity. The results indicate that the heat transfer coefficient under hypergravity is greater than that under normal gravity and increases with increasing hypergravity. The best existing correlation developed for normal gravity has the mean absolute deviation of 14.2% against the experimental data in the hypergravity range.
机译：为了评估重力对两相流沸腾传热系数的影响，进行了R134a在超重力作用下的流沸腾实验研究。实验是在超重力（1.12-3.16 g）和法向重力（1 g）下使用内径为2.168 mm的水平光滑铜管进行的，质量通量为725和910 kg / m〜2 s，热通量为19.0和28.5 kW / m〜2，饱和压力0.71和0.82 MPa（饱和温度27.2和32.2℃），蒸汽质量为0到0.65。超重力环境是由离心加速机产生的。将超重力下的实验数据与正常重力下的实验数据进行了比较，并与针对正常重力开发的11种出色的现有相关性的预测进行了比较。结果表明，超重力下的传热系数大于正常重力下的传热系数，并随着超重力的增加而增大。在超重力范围内，相对于实验数据而言，为正重力开发的最佳现有相关性的平均绝对偏差为14.2％。

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  • 来源
  • 作者

    Yu Xu; Xiande Fang; Guohua Li; Dingkun Li;

  • 作者单位

    Institute of Air Conditioning and Refrigeration, Nanjing University of Aeronautics and Astronautics, 29 Yudao St., Nanjing 210016, PR China;

    Institute of Air Conditioning and Refrigeration, Nanjing University of Aeronautics and Astronautics, 29 Yudao St., Nanjing 210016, PR China;

    Institute of Air Conditioning and Refrigeration, Nanjing University of Aeronautics and Astronautics, 29 Yudao St., Nanjing 210016, PR China;

    Institute of Air Conditioning and Refrigeration, Nanjing University of Aeronautics and Astronautics, 29 Yudao St., Nanjing 210016, PR China;

  • 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

    Two-phase flow; Flow boiling; Heat transfer coefficient; Gravity; Hypergravity;

    机译：两相流;流沸腾;传热系数;重力;超重力;

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