Epalle Alexandre, Catherin Mathilde, Cobian Manuel, Valette Stéphane
Laboratory of Tribology and Systems Dynamics, Ecole Centrale de Lyon, France.
Laboratory of Tribology and Systems Dynamics, Ecole Centrale de Lyon, France.
J Colloid Interface Sci. 2023 Dec 15;652(Pt A):362-368. doi: 10.1016/j.jcis.2023.07.207. Epub 2023 Aug 7.
To understand the relationship between topography and wetting, it is not enough to study the contact angle. Indeed, the liquid-solid interface plays an important role in wetting. However, data such as the total triple line length, the wetting area and the anchoring depth are inaccessible or difficult to obtain experimentally. This work proposes to overcome the experimental limitations by using a numerical approach to characterize the wetting behavior on textured surfaces.
The wetting behavior of an anisotropic textured surface was compared for both experimental and numerical approaches. The experimental wetting is characterized by sessile drop experiments. The simulations were performed by applying the pseudo-potential Lattice-Boltzmann method. The numerical approach was then used to predict the wetting behavior of different materials.
The simulations capture both the wetting state and the contact angle, in accordance with the experimental observation. Without making any assumptions about the interfacial shape and anchoring, the simulation allows to characterize the liquid-solid interface by quantifying the total length of the triple line and the wetting area. Simultaneously, the simulations enable the characterization of impregnation within textures for complex mixed regimes.
为了理解形貌与润湿性之间的关系，仅研究接触角是不够的。实际上，液 - 固界面在润湿性中起着重要作用。然而，诸如总三线长度、润湿面积和锚固深度等数据难以通过实验获取或根本无法获取。这项工作提出通过使用数值方法来表征纹理表面上的润湿行为，以克服实验限制。
对各向异性纹理表面的润湿行为进行了实验和数值方法的比较。实验润湿性通过静滴实验来表征。模拟通过应用伪势格子玻尔兹曼方法进行。然后使用数值方法预测不同材料的润湿行为。
模拟结果与实验观察结果一致，能够捕捉到润湿状态和接触角。在不对界面形状和锚固做任何假设的情况下，该模拟通过量化三线的总长度和润湿面积来表征液 - 固界面。同时，模拟能够对复杂混合状态下纹理内部的浸渍情况进行表征。
