Spreading Simulation of Droplet Impact on Solid Surface with CLSVOF Method and Its Experimental Verification

A coupled volume-of-fluid and level set (CLSVOF) method is applied for the simulation of droplet impacting on a solid surface. This two-phase flow approach combines the advantages of VOF and level set (LS) methods. Three cases are listed and simulated by CLSVOF method, and the wettability is evaluated by tracking the three-phase contact line (TPCL). Results showed that the change of liquid spreading ratio with time has a good fit with the experimental results of the above three cases and high accuracy is achieved by CLSVOF method compared with VOF method, which indicated that this model is suitable for researching the wetting problem. The spreading speed on good wettability surfaces is faster than that of on poor wettability surfaces significantly, and the recoiling phenomenon appears after the droplet spreading to its maximum.