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首页> 外文期刊>International Journal of Heat and Mass Transfer >Saturated flow boiling heat transfer of R-410A and associated bubble characteristics in a narrow annular duct
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Saturated flow boiling heat transfer of R-410A and associated bubble characteristics in a narrow annular duct

机译：R-410A的饱和流沸腾传热和窄环形管道中的相关气泡特性

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摘要

Experiments are conducted here to investigate how the channel size affects the R-410A saturated flow boiling heat transfer and associated bubble characteristics in a horizontal narrow annular duct. The gap of the duct is fixed at 1.0 and 2.0 mm in this study. The measured data indicate that the saturated flow boiling heat transfer coefficient increases with increasing refrigerant mass flux and saturated temperature and with a decrease in the gap size. Besides, raising the imposed heat flux can cause a significant increase in the boiling heat transfer coefficient. The results from the flow visualization show that the mean diameter of the bubbles departing from the heating surface decreases slightly with increasing refrigerant mass flux and saturated temperature. Moreover, the bubble departure frequency increases at reducing duct size and increasing mass flux. And at a high imposed heat flux many bubbles generated from the cavities in the heating surface tend to merge together to form big bubbles. Meanwhile, comparisons of the present heat transfer data for R-410A with R-407C and R-134a in the same duct and with some existing correlations are conducted. Furthermore, an empirical correlation for the present R-410A saturated flow boiling heat transfer data is proposed.
机译：在此进行实验，以研究通道尺寸如何影响水平窄环形管道中R-410A饱和流沸腾传热以及相关的气泡特性。在这项研究中，导管的间隙固定为1.0和2.0 mm。测量数据表明，饱和流沸腾传热系数随着制冷剂质量流量和饱和温度的增加以及间隙尺寸的减小而增加。此外，提高施加的热通量会引起沸腾传热系数的显着增加。流动可视化的结果表明，离开制冷剂表面的气泡的平均直径随制冷剂质量流量和饱和温度的增加而略有减小。而且，气泡的离开频率随着管道尺寸的减小和质量流量的增加而增加。在强的热通量下，从加热表面的空腔产生的许多气泡趋于融合在一起而形成大气泡。同时，将R-410A与R-407C和R-134a在同一管道中的当前传热数据进行了比较，并进行了一些相关的比较。此外，提出了与当前R-410A饱和流沸腾传热数据的经验相关性。

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  • 来源
    《International Journal of Heat and Mass Transfer》 |2011年第24期|p.4988-5000|共13页
  • 作者

    C.A. Chen; K.W. Li; Y.M. Lie; T.F. Lin;

  • 作者单位

    Department of Mechanical Engineering, National Chiao Tung University. Hsinchu, 1001 Ta Hsueh Road, Hsinchu 30010, Taiwan, ROC;

    Department of Mechanical Engineering, National Chiao Tung University. Hsinchu, 1001 Ta Hsueh Road, Hsinchu 30010, Taiwan, ROC;

    Department of Mechanical Engineering, National Chiao Tung University. Hsinchu, 1001 Ta Hsueh Road, Hsinchu 30010, Taiwan, ROC;

    Department of Mechanical Engineering, National Chiao Tung University. Hsinchu, 1001 Ta Hsueh Road, Hsinchu 30010, Taiwan, ROC Corresponding author.;

  • 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

    Saturated flow boiling heat transfer; R-410A; Bubble characteristics; Mini-channel;

    机译：饱和流沸腾传热;R-410A;气泡特性;微通道;

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