Numerical simulation of drop capturing capabilities on heterogeneous walls

In order to study the drop capturing capabilities of heterogeneous walls, a numerical method is developed by integrating the generalized Navier boundary condition into front tracking method (FTM) to establish the contact angle model. The numerical simulation of the movement of drops on the heterogeneous wall with non-uniform wetting was carried out. The drop slides on the inclined wall from the uniform wetting part to the non-uniform wetting part. The movement of the drop in the non-uniform wetting area is studied by changing the Bo number, the Oh number and the non-uniform wetting degree. the results show that when the Bo number becomes lager, the movement of drop will be less affected by the resistance of the wall and the velocity of the drop will become larger which makes it difficult to be captured; the greater the Oh number is, the less effect of wall surface resistance on the drop is, and the more difficult it is to capture the drop; when the non-uniform wetting degree becomes lager, the resistance of the heterogeneous wall to drop will be greater, and the drop will be captured more easily.