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首页> 外文期刊>Transport in Porous Media >A Two-Phase SPH Model for Dynamic Contact Angles Including Fluid-Solid Interactions at the Contact Line
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A Two-Phase SPH Model for Dynamic Contact Angles Including Fluid-Solid Interactions at the Contact Line

机译：动态接触角的两相SPH模型，包括接触线处的流体-固体相互作用

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摘要

The description of wetting phenomena on the continuum scale is a challenging problem, since intermolecular interactions, like van der Waals forces between liquid and solid, alter the flow field at the contact line. Recently, these effects were included in the smoothed particle hydrodynamics method by introducing a contact line force (CLF) on the continuum scale. This physically based contact line force model is employed here to simulate two-phase flow in a wide range of wetting dynamics parametrized by capillary number. In particular, dynamic contact angles at various capillary number values are calculated by CLF model and compared to measured values. We find that there is significant disagreement between simulated and measured results, specially at low wetting speeds. It is indeed expected that most of the driving force is dissipated to overcome strong liquid-solid interactions, which are not adequately accounted for in the existing CLF model. Therefore, we have extended that model to account for stick-slip (SSL) behavior of the contact line caused by solid-fluid interactions. The new SSL model results in dynamic contact angle values that are in good agreement with experimental data for the full range of wetting dynamics.
机译：在连续尺度上描述润湿现象是一个具有挑战性的问题，因为分子间的相互作用（如液体和固体之间的范德华力）会改变接触线处的流场。最近，通过在连续尺度上引入接触线力（CLF），将这些效果包括在平滑粒子流体动力学方法中。在此采用基于物理的接触线力模型来模拟在广泛的以毛细管数为参数的润湿动力学范围内的两相流。特别是，通过CLF模型计算各种毛细管数值下的动态接触角，并将其与测量值进行比较。我们发现，模拟结果和测量结果之间存在很大的分歧，特别是在低润湿速度下。确实可以预期，大多数驱动力会被驱散，以克服强大的液-固相互作用，而在现有的CLF模型中并没有充分考虑到这种相互作用。因此，我们已将该模型扩展为解决由固液相互作用引起的接触线的粘滑（SSL）行为。新的SSL模型产生的动态接触角值与所有润湿动态范围的实验数据都非常吻合。

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