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首页> 外文期刊>International Journal of Heat and Mass Transfer >Heat transfer during the condensation of R134a inside eight parallel microchannels
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Heat transfer during the condensation of R134a inside eight parallel microchannels

机译：R134a在八个平行微通道内冷凝期间的传热

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摘要

In this study the local heat transfer coefficient was investigated experimentally during the convective condensation of R-134a inside eight round (diameter D = 0.77 mm) horizontal and parallel microchannels. The test conditions included the pressure p, the vapor quality x_v, the heat flux q and the mass velocity G ranging from 7.3 to 9.7 bar, 0.55 to 1, 17 to 53 kW m~(-2), and 230 to 445 kg m~(-2) s~(-1) respectively. The influence of temperature, heat flux, mass velocity and quality on the heat transfer coefficient, h, was evaluated. The results show that mass velocity and vapor quality have an important influence on the heat transfer coefficient. The consideration that all of the resistance to heat transfer is due to the conduction through the liquid film is a good approximation, mainly for x_v ＜ 0.95. The experimental results were comparable with correlations and semi-empirical models described in the literature.
机译：在本研究中，通过实验研究了R-134a在八个圆形（直径D = 0.77 mm）水平和平行微通道内的对流冷凝过程中的局部传热系数。测试条件包括压力p，蒸气质量x_v，热通量q和质量速度G，范围分别为7.3至9.7 bar，0.55至1,17至53 kW m〜（-2）和230至445 kg m 〜（-2）s〜（-1）。评估了温度，热通量，质量速度和质量对传热系数h的影响。结果表明，质量速度和蒸汽质量对传热系数有重要影响。主要针对x_v ＜0.95，可以认为所有传热阻力都是通过液膜的传导引起的。实验结果与文献中描述的相关性和半经验模型相当。

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  • 来源
  • 作者

    G. Goss Jr.; J.C. Passos;

  • 作者单位

    Department of Mechanical Engineering, LEPTEN, Laboratory of Process of Engineering and Energy Technology, Federal University of Santa Catarina, 88010-900 Florianopolis, SC, Brazil;

    Department of Mechanical Engineering, LEPTEN, Laboratory of Process of Engineering and Energy Technology, Federal University of Santa Catarina, 88010-900 Florianopolis, SC, Brazil;

  • 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

    Convective condensation; Microchannels; Heat transfer;

    机译：对流冷凝;微通道;传播热量;

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