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首页> 外文期刊>International Journal of Heat and Mass Transfer >Flow condensation in parallel micro-channels - Part 2: Heat transfer results and correlation technique
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Flow condensation in parallel micro-channels - Part 2: Heat transfer results and correlation technique

机译：平行微通道中的冷凝水-第2部分：传热结果和相关技术

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摘要

This second part of a two-part study concerns heat transfer characteristics for FC-72 condensing along parallel, square micro-channels with a hydraulic diameter of 1 mm, which were formed in the top surface of a solid copper plate. Heat from the condensing flow was rejected to a counter flow of water through channels brazed to the underside of the copper plate. The FC-72 condensation heat transfer coefficient was highest near the channel inlet, where the annual liquid film is thinnest. The heat transfer coefficient decreased along the micro-channel because of the film thickening and eventual collapse of the annular regime. Notable heat transfer enhancement was observed for annular flow regions of the micro-channel associated with interfacial waves. Comparing the present data to predictions of previous annular condensation heat transfer correlations shows correlations intended for macro-channels generally provide better predictions than correlations intended specifically for mini/micro-channels. A new condensation heat transfer coefficient correlation is proposed for annular condensation heat transfer in mini/micro-channels. The new correlation shows excellent predictive capability based on both the present FC-72 data and a large database for mini/micro-channel flows amassed from eight previous sources.
机译：这是一个由两部分组成的研究的第二部分，涉及FC-72沿着传热特性的问题，这些传热特性是沿着平行的方形微通道冷凝的，该通道的水力直径为1毫米，形成在固态铜板的上表面。冷凝流产生的热量通过铜焊到铜板底面的通道被排出到水的逆流中。 FC-72冷凝水的传热系数在通道入口附近最高，那里的年度液膜最薄。沿微通道的传热系数降低，这是因为薄膜增厚以及最终环形区域的塌陷。在与界面波有关的微通道的环形流动区域中观察到显着的传热增强。将当前数据与先前的环形冷凝传热相关性的预测进行比较表明，与专用于微型/微通道的相关性相比，用于宏通道的相关性通常提供更好的预测。提出了一种新的冷凝传热系数相关性，用于微型/微通道中的环形冷凝传热。新的相关性基于当前的FC-72数据和大型数据库（针对来自八个先前来源的微型/微通道流量）显示出出色的预测能力。

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  • 来源
    《International Journal of Heat and Mass Transfer》 |2012年第4期|p.984-994|共11页
  • 作者

    Sung-Min Kim; Issam Mudawar;

  • 作者单位

    Boiling and Two-Phase Flow Laboratory (BTPFL) and Purdue University International Electronic Cooling Alliance (PUIECA), Mechanical Engineering Building. 585 Purdue Mall. West Lafayette. IN 47907-2088. USA;

    Boiling and Two-Phase Flow Laboratory (BTPFL) and Purdue University International Electronic Cooling Alliance (PUIECA), Mechanical Engineering Building. 585 Purdue Mall. West Lafayette. IN 47907-2088. USA;

  • 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; micro-channel; high-flux;

    机译：缩合;微通道高通量;

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