To study the dynamic wetting mechanism of droplets under the electrowetting effect

the electrowetting dynamic motion process of a sodium chloride droplet on the surface of Parylene film is numerically simulated using COMSOL software

based on the 2D Navier-Stokes equation and combined with dynamic mesh technology

and the influence of different DC voltages on droplet morphology is analyzed.An experimental platform of electrowetting system is built and experimental testes are conducted.The results show that the maximum error between the diameter of droplet wetting obtained by numerical simulation and the experimental test results is less than 1.7%.With the increase of time

the droplet wetting diameter first increases and then decreases

accompanied by an oscillatory and attenuating trend.At the same time

with the increase of DC voltage

the droplet wetting diameter gradually increases.Specifically

when the DC voltage increases from 10V to 25V

the maximum peak value of droplet wetting diameter increases from 3.54mm to 4.02mm.By revealing the dynamic wetting mechanism of droplets in the electrowetting process

this study provides a theoretical basis for the precise regulation and engineering application of the electrowetting interface.