Numerical simulation of successive collision of two liquid droplets with asolid wall

Spray jet impingement is widely used to cool hot solids in iron- and steel- making processes. Numerous droplets impinge onto a solid at random and inte ract with each other. The present study treats the deformation behavior of two liquid drops one by one impinging coaxially onto a solid. The system of Navier-Stokes equations for incompressible fluid flow in the axial coordin ate system is solved by means of a finite difference method. The effect of surface tension, gravity, and wettability between the liquid and the solid is taken into account. First, the deformation behavior of a single drop ont o a solid is examined and compared to the experimental data for model valid ation. Then, the collision of two drops in tandem with the solid is simulat ed. The effect of the distance between two drops on the deformation behavio r is studied. The physics of interaction phenomena of droplets is investiga ted theoretically.