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首页> 外文期刊>Applied Physics Letters >Pool boiling enhancement through bubble induced convective liquid flow in feeder microchannels
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Pool boiling enhancement through bubble induced convective liquid flow in feeder microchannels

机译：进料器微通道中气泡引起的对流液流增强池沸腾

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摘要

Bubbles departing from the nucleation sites induce a liquid flow from the bulk to the heated surface during pool boiling. Alternating the nucleating regions with non-nucleating regions facilitates separate liquid-vapor pathways for departing vapor bubbles and returning liquid. We explored an additional enhancement through liquid feeder channels on the heater surface directing the returning liquid towards the nucleating region. The nucleating bubbles were confined to the nucleating region as the returning liquid flow induced strong convective currents over the non-nucleating regions. In the best performing configuration, the nucleating regions were 0.5 mm wide, separated by non-nucleating regions of width 2.125 mm, which corresponded to the bubble departure diameter. The non-nucleating regions contained 0.5 mm wide feeder channels directing liquid towards the nucleating region. High speed images indicated distinct vapor columns over the nucleating regions with liquid channeled through the feeder channels. At higher heat fluxes, the strong liquid currents established over the feeder channels suppressed any undesirable nucleation in them keeping the separated vapor-liquid pathways functional. This enhancement technique resulted in a critical heat flux of 394W/cm~2 at a wall superheat of 5.5 ℃ which translated to a heat transfer coefficient of 713kW/m ℃. The additional surface area and high heat transfer coefficient due to microchannel flow in feeder channels, and the unobstructed surface available for the bubbles to expand over the prime heat transfer surface area before departing were seen to be responsible for their superior performance.
机译：在池沸腾期间，从成核位置离开的气泡会引起液体从本体流到受热表面。使成核区域与非成核区域交替有利于分离的液体-蒸气路径，用于离开蒸气气泡和返回液体。我们探索了通过加热器表面上的液体进料通道将返回的液体引向成核区域的另一种增强方法。当返回的液流在非成核区域上引起强对流时，成核气泡被限制在成核区域内。在性能最佳的配置中，成核区域的宽度为0.5 mm，被宽度为2.125 mm的非成核区域隔开，该区域与气泡离开直径相对应。非成核区域包含0.5 mm宽的进料通道，将液体引向成核区域。高速图像表明，在成核区域上有明显的蒸气柱，液体通过进料器通道引导。在较高的热通量下，在进料通道上建立的强液流抑制了进料通道中的任何不良成核，从而保持了分离的气液通道的功能。这种增强技术在5.5℃的壁过热条件下产生了394W / cm〜2的临界热通量，转化为713kW / m℃的传热系数。由于进料通道中的微通道流动而产生的额外表面积和高传热系数，以及气泡在离开之前可在主要传热表面积上膨胀的无障碍表面，被认为是其卓越性能的原因。

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  • 来源
    《Applied Physics Letters》 |2016年第4期|041604.1-041604.5|共5页
  • 作者

    A. Jaikumar; S. G. Kandlikar;

  • 作者单位

    Microsystems Engineering Department, Rochester Institute of Technology, Rochester, New York 14623, USA;

    Microsystems Engineering Department, Rochester Institute of Technology, Rochester, New York 14623, USA,Mechanical Engineering Department, Rochester Institute of Technology, Rochester, New York 14623, USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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  • 正文语种 eng
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