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Pressure Drop During Condensation in Microchannels

机译：微通道冷凝过程中的压降

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摘要

The paper reports calculations of friction pressure gradient for the special case of laminar annular flow condensation in microchannels. This is the only flow regime permitting theoretical solution without having recourse to experimental data. Comparisons are made with correlations based on experimental data for Rl34a. The correlations differ somewhat among themselves with the ratio of highest to lowest predicted friction pressure gradient typically around 1.4 and nearer to unity at high quality. The friction pressure gradients given by the laminar annular flow solutions are in fair agreement with the correlations at high quality and lower than the correlations at lower quality. Attention is drawn to the fact that the friction pressure gradient cannot be directly observed and its evaluation from measurements requires estimation of the nondissipative momentum or acceleration pressure gradient. Methods used to estimate the nondissipative pressure gradient require quality and void fraction together with equations which relate these and whose accuracy is difficult to quantify. Quality and void fraction can be readily found from the laminar annular flow solutions. Significant differences are found between these and values from approximate equations.
机译：本文报道了在微通道中层状环形流冷凝的特殊情况下的摩擦压力梯度的计算。这是唯一无需理论数据即可进行理论求解的流动状态。基于Rl34a的实验数据进行相关性比较。它们之间的相关性有所不同，最高和最低预测摩擦压力梯度之比通常约为1.4，在高质量下接近于单位。层状环形流解给出的摩擦压力梯度与高质量下的相关性完全一致，而低于劣质下的相关性。注意以下事实：不能直接观察到摩擦压力梯度，并且根据测量结果进行评估需要估算非耗散动量或加速压力梯度。用于估计非耗散压力梯度的方法需要质量和空隙率以及与它们相关的方程式，其精确度难以量化。从层状环形流解决方案中可以轻松找到质量和空隙率。发现这些值与近似方程的值之间存在显着差异。

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  • 来源
    《Journal of Heat Transfer》 |2013年第9期|091602.1-091602.4|共4页
  • 作者

    Hua Sheng Wang; Jie Sun; John W. Rose;

  • 作者单位

    School of Engineering and Materials Science, Queen Mary, University of London, Mile End Road, London E1 4NS, UK;

    School of Engineering and Materials Science, Queen Mary, University of London, Mile End Road, London E1 4NS, UK,Institute of Engineering Thermophysics, Chinese Academy of Science, Beijing 100190, China;

    School of Engineering and Materials Science, Queen Mary, University of London, Mile End Road, London E1 4NS, UK;

  • 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

    condensation; microchannel; surface tension; pressure drop; refrigerant; heat exchanger;

    机译：缩合;微通道表面张力;压力下降;制冷剂热交换器;

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