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Role of the rate of surface dilatation in determining microscopic dynamic contact angle

机译：表面扩张速率在测定微观动态接触角的作用

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摘要

The factors determining the degree of dynamic wetting, which is characterized by the microscopic dynamic contact angle, have been the subject of much discussion. In this manuscript, it is analytically determined that the microscopic dynamic contact angle is dependent on the rate of surface dilatation in addition to the thermodynamic surface tension. It is argued that, in the vicinity of a moving contact line, this rate of surface dilatation results in a disparity between the thermodynamic and mechanical surface tensions, which are almost always assumed to be equal. It is also found that, in the case of forced wetting, the difference between the receding and advancing contact angles is primarily due to the rate of surface compression at the receding contact line and the rate of surface expansion at the advancing contact line. These findings, which are validated using molecular dynamics simulations, demonstrate that surface dilatation is an important factor responsible for the deviation of the microscopic dynamic contact angle from its static equilibrium value. Published under license by AIP Publishing.
机译：确定动态润湿程度的因素，其特征在于微观动态接触角，是大量讨论的主题。在该稿件中，在分析中，微观动态接触角依赖于除热力表面张力之外的表面扩张速率。据称，在移动接触线附近，这种表面扩张速率导致热力学和机械表面张力之间的视差，这几乎总是被认为是相等的。还发现，在强制润湿的情况下，后退和推进接触角之间的差异主要是由于在前进接触线处的表面压缩速率和前进接触线处的表面膨胀速率。使用分子动力学模拟验证的这些发现表明，表面扩张是负责从其静态平衡值偏离微观动态接触角的重要因素。通过AIP发布在许可证下发布。

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    《Physics of fluids》 |2020年第1期|共12页
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  • 正文语种 eng
  • 中图分类 流体力学;
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