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首页> 外文期刊>Journal of Heat Transfer >Prediction of Vapor Film Thickness Below a Leidenfrost Drop
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Prediction of Vapor Film Thickness Below a Leidenfrost Drop

机译:莱顿弗罗斯特液滴以下的蒸气膜厚度的预测

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摘要

In this work, the vapor film thickness below a stagnant Leidenfrost drop at saturation temperature is predicted by performing a balance of the dominant forces acting on the drop. Inclusion of a new momentum force term is proposed. Two assumptions are considered for the radial velocity of vapor at drop-vapor interface. One of them is zero radial velocity at interface and the other is zero shear at interface. The actual scenario is expected to lie between these extremes. This is also supported by the comparison against experimental data on vapor film thickness. The effect of convection in the vapor layer is also modeled and it is shown that the use of ad hoc heat transfer coefficients in the vapor layer to explain difference between experiments and prediction is incorrect. Finally, it is highlighted that accurate prediction of the vapor layer characteristics also requires proper quantification of the shape of the drop-vapor interface.
机译:在这项工作中,通过对作用在液滴上的主导力进行平衡,可以预测在饱和温度下停滞的莱顿弗罗斯特液滴之下的蒸汽膜厚度。建议包括一个新的动量力项。对于液滴-蒸汽界面处的蒸汽径向速度,考虑了两个假设。其中一个是界面处的径向速度为零,另一个是界面处的零剪切。实际情况预计将介于这些极端之间。与蒸气膜厚度的实验数据进行比较也证明了这一点。还对蒸气层中对流的影响进行了建模,结果表明在蒸气层中使用临时传热系数来解释实验和预测之间的差异是不正确的。最后,要强调的是,准确预测蒸气层特性还需要对液滴-蒸气界面的形状进行适当的量化。

著录项

  • 来源
    《Journal of Heat Transfer》 |2015年第12期|124501.1-124501.5|共5页
  • 作者单位

    Reactor Engineering Division, Bhabha Atomic Research Centre, Mumbai 400085, India;

    Reactor Engineering Division, Bhabha Atomic Research Centre, Mumbai 400085, India;

    Reactor Engineering Division, Bhabha Atomic Research Centre, Mumbai 400085, India;

    Reactor Engineering Division, Bhabha Atomic Research Centre, Mumbai 400085, India;

  • 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

    Leidenfrost drops; heat transfer; vapor film thickness;

    机译:莱顿弗罗斯特滴眼液;传播热量;蒸气膜厚度;

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