Impact of viscoelastic droplet

Authors: Wang, Y.W., Do-Quang, M., Amberg, G.A.
Document Type: Article
Pubstate: Submitted
Journal: Soft Matter
Year: 2016


We conduct numerical experiments on polymeric droplets hitting a flat solid surface, in realistic circumstances. The results present time-resolved non-Newtonian stresses acting in the droplet, which so far have not been measured experimentally. Comparing with the simulation of the impact of a Newtonian droplet, the effects of viscoelasticity on droplet behaviors such as splashing, the maximum spreading diameter and deformation are analyzed. With detailed information on the contact region, we demonstrate how the contact line behaves according to the transition of fluid from elasticity dominated to shear-thinning dominated when a droplet expands and contracts on the substrate. The work is inspired by several experiments on similar cases and we discuss whether and how the elasticity in an impinging droplet takes effect.