Impingement of suspending droplets with coming ones at different off-central distances: A molecular dynamics study

Impingement of binary nanodroplets on solid surface can produce various outcomes, which are very important to various practical applications, such as lab on a chip and digital microfluidics. In the present work, we aim at exploring impacting systems with suspened nanodroplets and coming ones at various conditions. The effect of off-central distances, intrinsic contact angles, and Weber number is studied with the help of observing free evolution of targeted systems and several important characteristic parameters. This work reveals the effect of the off-central distance that is one of the most important characteristic parameters in impacting dynamics, mainly including generating rotating effect, spreading behavior with asynchronous dynamics, and hysteretic bouncing dynamics. The finding is very helpful for improving the understanding of off-central implementation of targeted systems, which can guide the practical application that needs to control outcomes of impacting binary nanodroplets.