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Experimental and LBM simulation study on the effect of bubbles merging on flow boiling

机译：气泡合并对流沸腾影响的实验和LBM模拟研究

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摘要

Surfactant additives can prevent bubbles merging and change the flow mode in flow boiling. This work presented the effect of bubbles merging on flow boiling heat transfer performance of water. Flow boiling experiment and lattice Boltzmann method (LBM) were carried out in a rectangular channel. With a high speed camera, the flow boiling process has been recorded. D2Q9 model and the Peng-Robinson (P-R) equation of two phase state (EOS) were used to simulate flow boiling process. The present experimental results showed that surfactant addition could enhance the flow boiling heat transfer and increased the critical heat flux (CHF). And there were more nucleation sites, larger bubbles density and smaller bubble size in surfactant solution. The present simulation results showed that the flow boiling without bubbles merging has higher and more stable average Nu number. The bubbles merging made the middle nucleation sites lose effectiveness. It implies that preventing bubbles merging is another factor of surfactant addition enhancing boiling heat transfer. (C) 2018 Elsevier Ltd. All rights reserved.
机译：表面活性剂添加剂可防止气泡合并并改变流沸腾中的流态。这项工作提出了气泡合并对水流沸腾传热性能的影响。在矩形通道中进行了流煮实验和格子玻尔兹曼方法（LBM）。使用高速相机记录了流煮过程。用D2Q9模型和两相状态的Peng-Robinson（P-R）方程（EOS）来模拟沸腾过程。目前的实验结果表明，添加表面活性剂可以提高沸腾流的传热效率，并提高临界热通量（CHF）。并且在表面活性剂溶液中存在更多的成核位置，较大的气泡密度和较小的气泡尺寸。目前的模拟结果表明，没有气泡合并的流沸腾具有更高和更稳定的平均Nu值。气泡合并使中间成核位置失去效力。这意味着防止气泡合并是表面活性剂添加增加沸腾传热的另一个因素。 （C）2018 Elsevier Ltd.保留所有权利。

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  • 来源
    《International Journal of Heat and Mass Transfer》 |2019年第4期|1053-1061|共9页
  • 作者

    Wang Jue; Cheng Yi; Li Xiao-Bin; Li Feng-Chen;

  • 作者单位

    Tsinghua Univ, Dept Chem Engn, Beijing 100084, Peoples R China|Sun Yat Sen Univ, Sino French Inst Nucl Engn & Technol, Zhuhai 519082, Peoples R China;

    Tsinghua Univ, Dept Chem Engn, Beijing 100084, Peoples R China;

    Sun Yat Sen Univ, Sino French Inst Nucl Engn & Technol, Zhuhai 519082, Peoples R China;

    Sun Yat Sen Univ, Sino French Inst Nucl Engn & Technol, Zhuhai 519082, Peoples R China;

  • 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

    Flow boiling; Nucleation site; Bubbles merging; Experiment; LBM;

    机译：流动沸腾;成核部位;气泡合并;实验;LBM;

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