Numerical simulation of a droplet motion in a grooved microchannel
带凹槽的微通道中液滴运动数值模拟

In this paper,an improved dissipative particle dynamics（DPD） method is used to simulate droplet motion in a grooved microchannel. In the improved DPD method,a recently proposed combination of short-range repulsive and long-range attractive interaction is adopted can simulate fluid flows with free surfaces,such as droplet motions.Firstly the static contact angle between the droplet and the solid wall is simulated with a new potential function,and "static contact angle～awf/af" curve is obtained by the 2nd order polynomial fit.Then the influences of wall wettability,flow field force,and droplet temperature on the flow pattern of droplet in the grooved microchannel are investigated.The results show that wall wettability and flow field force have large affects on the flow pattern of the droplet,while droplet temperature has little effects on it.The results in this paper are helpful for understanding the fluid flow behavior with free surfaces on rough surface.