Droplet Wettability Analysis On Microstructured Surfaces Based On 3-d Lattice Boltzmann Method

The study of surface wettability has been of great interest in recent years.Researchers can prepare superhydrophobic or superhydrophobic solid surfaces for various applications by changing surface chemistry and constructing micro-different microstructures,etc.However,due to the complex solid-liquid interaction process,the study of superhydrophobic surface wetting needs to consider the effects of various factors,such as substrate materials,microstructure morphology parameters,and external environment.Although a large number of experimental and simulated wetting studies have been conducted,there is no effective method for predicting the wetting process inside the droplet and surface microstructure.The mesoscopic fluid numerical simulation algorithm LBM has excellent performance for fluid simulation,and two-dimensional LBM is more widely used in research,but it cannot accurately simulate complex microstructure morphology parameters.Therefore,it is necessary to extend the two-dimensional LBM lattice wetting to three-dimensional lattice structures to study the wetting evolution process inside the microstructure between solid and liquid,so we choose to use the three-dimensional LBM method to simulate and calculate the wetting process on the microstructure surface.In this paper,we simulate the effect of 3D D3Q19 lattice velocity distribution model on the stability of liquid-gas interface and the wetting process on the microstructure surface.A microstructure surface wetting model based on 3D LBM droplets in a smooth plane and different morphological parameters is constructed.First,the 3D LBM smooth plane wetting model is used to simulate the substrate as silicon and PDMS smooth walls and the microstructure surface,and the pseudo-potential force,velocity and pressure changes and other data are used to analyze the wetting behavior and contact angle of the hydrophilic surface,and then the 3D LBM simulation The results are then compared with the experimental data to verify the reliability and stability of the model.The simulation model of inclined surface wetting was designed by reconstructing the computational domain,and the simulation of hydrophobic smooth inclined surface wetting process with an inclination angle of 30° was carried out.Based on the validated smooth plane wetting model,a microstructure surface wetting model was constructed,and the wetting process on the microstructure surface with different morphological parameters was simulated,and the droplet-microstructure contact surface,droplet internal pressure changes,etc.were discussed.The reliability and accuracy of the simulation can provide important guidance for the design and wetting behavior of surface microstructures.