Experimental and numerical study of liquid film by jet impingement: Based on contact angle model

Liquid film by jet impingement is widely applied in aerospace, steel quenching, ink-jet printing, and cleaning. In this paper, simulations with the modified contact angle model were used to describe the characteristics of the liquid film. Based on the Hoffman's law and the Tanner's correlation, the contact angle model was constructed and further nested within the Coupled Level Set and Volume of Fluid model. The model determined the movement direction of contact line according to the inner product of the normal vector at the phase interface and the lateral velocity in the cell and then outputted the value of the contact angle. Results showed that the advancing and the receding contact angles of droplet were inappropriate for the simulation of the liquid film. The size of the liquid film obtained by the static contact angle largely depended on the selection of contact angle values. Instead, the modified contact angle model provided an accurate prediction on the morphology and the size of the liquid film.