Hypothesis

The mechanisms of dynamic wetting of solid–liquid-liquid (SLL) system, especially the viscosity effects of two liquids, can be investigated by the molecular kinetic theory (MKT).

Methods

The molecular kinetic theory combined with published data was used to study the roles of a fluid viscosity and a solid surface in dynamic wetting.

Findings

First, the MKT on dynamic wetting was introduced and its limitation was analyzed. Second, a viscosity effect and a solid surface effect were considered. The viscosity effect was divided into three parts for the first time, including two pure liquid zones and a mixing zone. Third, a coefficient activation free energy model was proposed, considering the effects of mixing liquids and a solid surface. Finally, the key parameters in the MKT and the application and validation of the coefficient activation free energy model were discussed in detail. This model can explain the energy dissipation in a vicinity of a three-phase contact-line successfully in a SLL wetting system. This work sheds light on the physical mechanisms of fluid and solid surface properties on the dynamic wetting in a SLL system.

中文翻译：

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固-液-液系统的动态润湿的分子动力学理论。

假设

固-液-液（SLL）系统的动态润湿机理，尤其是两种液体的粘度效应，可以通过分子动力学理论（MKT）进行研究。

方法

分子动力学理论与公开的数据相结合，用于研究流体粘度和固体表面在动态润湿中的作用。

发现

首先，介绍了动态润湿的MKT，并对其局限性进行了分析。其次，考虑了粘度效应和固体表面效应。首次将粘度效应分为三部分，包括两个纯液体区和一个混合区。第三，考虑混合液体和固体表面的影响，提出了系数活化自由能模型。最后，详细讨论了MKT中的关键参数以及系数激活自由能模型的应用和验证。该模型可以成功地解释SLL润湿系统中三相接触线附近的能量耗散。这项工作揭示了SLL系统中动态润湿的流体和固体表面特性的物理机理。