Simulation of droplet spreading process on heterogeneous striped surface by lattice Boltzmann method

Wettability as a surface property has a great effect on the droplet spreading on substrate. The droplet motion control on surface can be achieved by combining hydrophobicity and hydrophilicity regions on substrate surface. And the possibility of using the heterogeneous surface formed by appropriate hydrophobic regions to guide the droplet spreading or splitting along certain directions has recently attracted much attention. In this paper, based on the lattice Boltzmann method, a flow model is established to simulate the droplet spreading process on heterogeneous surface. Using the proposed model, the dynamic morphology evolution of droplet on heterogeneous surface was obtained, and parameters affecting the equilibrium morphology were investigated, such as the width of the single stripe and the number of hydrophobic stripe.