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首页> 外文期刊>International Journal of Heat and Mass Transfer >Critical heat flux for subcooled flow boiling in micro-channel heat sinks
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Critical heat flux for subcooled flow boiling in micro-channel heat sinks

机译：微通道散热器中过冷沸腾的临界热通量

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摘要

Critical heat flux (CHF) was measured and examined with high-speed video for subcooled flow boiling in micro-channel heat sinks using HFE 7100 as working fluid. High subcooling was achieved by pre-cooling the working fluid using a secondary low-temperature refrigeration system. The high subcooling greatly reduced both bubble departure diameter and void fraction, and precluded flow pattern transitions beyond the bubbly regime. CHF was triggered by vapor blanket formation along the micro-channel walls despite the presence of abundant core liquid, which is consistent with the mechanism of Departure from Nucleate Boiling (DNB). CHF increased with increasing mass velocity and/or subcooling and decreasing hydraulic diameter for a given total mass flow rate. A pre-mature type of CHF was caused by vapor back-flow into the heat sink's inlet plenum at low mass velocities and small inlet subcoolings, and was associated with significant fluctuations in inlet and outlet pressure, as well as wall temperature. A systematic technique is developed to modify existing CHF correlations to more accurately account for features unique to micro-channel heat sinks, including rectangular cross-section, three-sided heating, and flow interaction between micro-channels. This technique is shown to be successful at correlating micro-channel heat sink data corresponding to different hydraulic diameters, mass velocities and inlet temperatures.
机译：测量了临界热通量（CHF），并通过高速视频检查了使用HFE 7100作为工作流体的微通道散热器中过冷流动沸腾的情况。通过使用次级低温制冷系统对工作流体进行预冷却，可以实现较高的过冷度。较高的过冷度大大减小了气泡离开的直径和空隙率，并且排除了超出气泡状态的流型转变。尽管存在丰富的核心液体，但沿着微通道壁的蒸汽覆盖形成触发了CHF，这与从核沸腾（DNB）脱离的机理是一致的。对于给定的总质量流量，CHF随着质量速度和/或过冷度的增加以及液压直径的减小而增加。 CHF的过早类型是由蒸汽以低质量速度和较小的入口过冷度回流到散热器的入口气室而引起的，并且与入口和出口压力以及壁温的明显波动有关。开发了一种系统技术来修改现有的CHF相关性，以更准确地说明微通道散热器的独特功能，包括矩形截面，三面加热以及微通道之间的流相互作用。该技术显示出在关联与不同液压直径，质量速度和入口温度相对应的微通道散热器数据方面的成功。

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  • 来源
    《International Journal of Heat and Mass Transfer》 |2009年第14期|3341-3352|共12页
  • 作者

    Jaeseon Lee; 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

    micro-channel; flow boiling; critical heat flux; subcooled boiling;

    机译：微通道流沸腾临界热通量;过冷沸腾;

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