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Asymmetric heat transfer characteristics of a double droplet impact on a moving liquid film

机译：双液滴撞击运动的液膜的不对称传热特性

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摘要

In this work, a coupled level-set and volume of fluid method is employed to investigate a two-dimensional double droplet impact on a moving liquid film. The flow and heat transfer characteristics are analyzed for various film moving velocities, horizontal spacings between the two droplets, impact velocities, and film thicknesses. The results show that four small jets occur near the neck at the contact regions between the droplet and film at the initial impact stage. Subsequently, the two peripheral jets expand outward and form a crown, while two inner jets merge into a central uprising jet. The largest local wall heat flux appears in the two impact regions; however, three extra peaks are observed in the jet regions due to the enhanced convection heat transfer. As compared with impact on the stationary film, the peripheral and central jets for impact on the moving film exhibit an asymmetric feature due to shearing effect of the film, leading to an asymmetric and enhanced local wall heat flux. The asymmetry becomes more significant for larger film moving velocities. The heat transfer enhancement in the impact region is more remarkable for a smaller spacing between the two droplets, a higher impact velocity, or a thinner film thickness based on the present simulation conditions. (C) 2018 Elsevier Ltd. All rights reserved.
机译：在这项工作中，采用液位和体积的耦合方法研究二维双液滴对运动液膜的影响。针对各种薄膜移动速度，两个液滴之间的水平间距，冲击速度和薄膜厚度，分析了流动和传热特性。结果表明，在初始冲击阶段，在液滴与薄膜之间的接触区域的颈部附近出现了四个小喷流。随后，两个外围射流向外扩展并形成冠状，而两个内部射流合并为中央起义射流。最大的局部壁热通量出现在两个冲击区域。然而，由于对流传热的增强，在射流区域观察到了三个额外的峰。与对静止膜的冲击相比，由于对膜的剪切作用，用于冲击运动膜的外围和中心射流表现出不对称的特征，从而导致不对称的局部壁热通量增加。对于较大的胶片移动速度，不对称性变得更加重要。基于当前的模拟条件，对于两个液滴之间的较小间距，较高的冲击速度或较薄的膜厚度，冲击区域中的传热增强更为显着。 （C）2018 Elsevier Ltd.保留所有权利。

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  • 来源
    《International Journal of Heat and Mass Transfer》 |2018年第ptab期|649-659|共11页
  • 作者

    Wang Yi-Bo; Wang Xiao-Dong; Wang Tian-Hu; Yan Wei-Mon;

  • 作者单位

    North China Elect Power Univ, State Key Lab Alternate Elect Power Syst Renewabl, Beijing 102206, Peoples R China;

    North China Elect Power Univ, State Key Lab Alternate Elect Power Syst Renewabl, Beijing 102206, Peoples R China;

    North China Elect Power Univ, State Key Lab Alternate Elect Power Syst Renewabl, Beijing 102206, Peoples R China;

    Natl Taipei Univ Technol, Dept Energy & Refrigerating Air Conditioning Engn, Taipei 10608, Taiwan;

  • 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

    Double droplet; Impact; Moving liquid film; Heat transfer; CLSVOF;

    机译：双液滴;冲击;移动的液膜;传热;CLSVOF;

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