基于Boltzamnn方法的表面微纳结构对材料润湿性能的影响

Effect of Micro/Nano-scale Structures on Wettability of Surface Based on LBM

采用格子Boltzmann方法从理论和数值计算角度探究了具有微柱阵列材料表面的润湿性,从而为材料表面形貌设计和加工提供参考。通过改变微柱的尺寸来探究材料表面的微纳结构与润湿性能的关系。采用Shan-Chen模型和D2Q9离散速度模型计算液滴的接触角。仿真结果表明对于疏水表面随着微柱的面积分数减小材料疏水性能增加,并且修饰微纳复合结构能使Cassie-Baxter状态更加稳定;对于亲水表面,增加微结构或微纳复合结构会使材料表面更加亲水。仿真结果和理论与现有实验结果一致。

Wetting behaviors of a droplet on a micro/nano square-post patterned surface with different geometrical parameters are investigated theoretically and numerically using the Lattice Boltzmann method(LBM)to provide guidelines for the preparation of hydrophilic and hydrophobic coatings.The relationship between the micro/nano-scale structure and wetting properties of the material surface is explored by changing the size of the micro-pillars.The article calculates apparent contact angle of a droplet by Shan-Chen model and D2 Q9 discrete velocity model.The results show that,for the hydrophobical surface,the smaller the solid area fraction,the greater the hydrophobicity is and the stabile the Cassie state of droplets will be.And for the hydrophilical surface,the surface with dual micro/nano-scale structures has an increased surface hydrophilicity.The simulation results are consistent with the theory and existing experimental results.