From splashing to bouncing: The influence of viscosity on the impact of suspension droplets on a solid surface

Martin H. Klein Schaarsberg*, Ivo R. Peters, Menachem Stern, Kevin Dodge, Wendy W. Zhang, Heinrich M. Jaeger

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

10 Citations (Scopus)
27 Downloads (Pure)

Abstract

We experimentally investigated the splashing of dense suspension droplets impacting a solid surface, extending prior work to the regime where the viscosity of the suspending liquid becomes a significant parameter. The overall behavior can be described by a combination of two trends. The first one is that the splashing becomes favored when the kinetic energy of individual particles at the surface of a droplet overcomes the confinement produced by surface tension. This is expressed by a particle-based Weber number Wep. The second is that splashing is suppressed by increasing the viscosity of the solvent. This is expressed by the Stokes number St, which influences the effective coefficient of restitution of colliding particles. We developed a phase diagram where the splashing onset is delineated as a function of both Wep and St. A surprising result occurs at very small Stokes number, where not only splashing is suppressed but also plastic deformation of the droplet. This leads to a situation where droplets can bounce back after impact, an observation we are able to reproduce using discrete particle numerical simulations that take into account viscous interaction between particles and elastic energy.

Original languageEnglish
Article number062609
JournalPhysical review E: covering statistical, nonlinear, biological, and soft matter physics
Volume93
Issue number6
DOIs
Publication statusPublished - 14 Jun 2016
Externally publishedYes

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