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首页> 外文期刊>Applied Physics Letters >Interplay between developing flow length and bubble departure diameter during macroconvection enhanced pool boiling
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Interplay between developing flow length and bubble departure diameter during macroconvection enhanced pool boiling

机译：大对流过程中显影流长度和气泡离开直径之间的相互作用增强了池沸腾

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摘要

Enhanced boiling structures based on the concept of separate liquid-vapor (L-V) pathways rely on the motion of the bubbles departing from the nucleating regions (NRs) to induce a macroconvective liquid jet impingement flow over adjacent non-boiling regions. Heat transfer in the non-boiling regions can be improved by incorporating microchannels which act as feeder channels (FCs) that also improve liquid directionality towards the NR. We hypothesize that the single-phase flow characteristics in the developing region of the FC contribute to the boiling enhancement and explore the interplay between the FC length, developing flow length, and departure bubble diameter. FC lengths shorter than the developing flow length benefit from the enhancement due to developing boundary layers over their entire length. However, FC lengths shorter than the departure bubble diameter suffer from bubble interference while FC lengths that are considerably longer than the developing flow length exhibit lower heat transfer rates in the fully developed region. This hypothesis was verified by conducting pool boiling experiments with four feeder channel lengths between 1 mm and 3 mm using HFE-7000, PP1, PP1C, and water. Three distinct regions: (i) interfering bubble, (ii) efficient L-V pathways, and (iii) diminished jet were identified to explain the boiling performance enhancement. This analysis will be beneficial in the pursuit to enhance critical heat flux (CHF) and heat transfer coefficient (HTC) on surfaces utilizing macroconvection mechanisms during boiling with different liquids. Published by AIP Publishing.
机译：基于单独的液体-蒸气（L-V）路径概念的增强沸腾结构依赖于从成核区域（NRs）离开的气泡运动，以在相邻的非沸腾区域上引起大对流液体射流撞击流。通过结合用作供料通道（FC）的微通道也可以改善非沸腾区域的传热，这些通道也可以改善液体流向NR的方向性。我们假设FC的发育区域中的单相流动特性有助于沸腾的增强，并探讨了FC长度，显影流动长度和离开气泡直径之间的相互作用。小于显影流动长度的FC长度得益于增强作用，这是由于在其整个长度上形成了边界层。然而，比离开气泡直径短的FC长度受到气泡干扰，而比显影流动长度长得多的FC长度在完全显影区域中表现出较低的传热速率。通过使用HFE-7000，PP1，PP1C和水在1mm至3mm之间的四个进料通道长度进行池沸腾实验，验证了该假设。确定了三个不同的区域：（i）干扰气泡，（ii）有效的L-V通道和（iii）射流减少以解释沸腾性能的提高。该分析将有助于提高在不同液体沸腾期间利用大对流机制提高表面的临界热通量（CHF）和传热系数（HTC）。由AIP Publishing发布。

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  • 来源
    《Applied Physics Letters》 |2018年第7期|071603.1-071603.5|共5页
  • 作者

    Jaikumar A.; Emery T. S.; Kandlikar S. G.;

  • 作者单位

    Rochester Inst Technol, Microsyst Engn Dept, Rochester, NY 14623 USA;

    Rochester Inst Technol, Microsyst Engn Dept, Rochester, NY 14623 USA;

    Rochester Inst Technol, Microsyst Engn Dept, Rochester, NY 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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