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

From splashing to bouncing: The influence of viscosity on the impact of suspension droplets on a solid surface
From splashing to bouncing: The influence of viscosity on the impact of suspension droplets on a solid surface
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.
1539-3755
1-7
Klein Schaarsberg, Martin H.
a836ae61-3890-4c34-a942-ea370e4d9413
Peters, Ivo R.
222d846e-e620-4017-84cb-099b14ff2d75
Stern, Menachem
435a6d0e-564a-408f-a7bb-7079e2805f41
Dodge, Kevin
c30787eb-4bd1-488a-b355-e3eb59e8c8b8
Zhang, Wendy W.
85d8f2da-b0a6-4e5e-90ac-38a0dda7c352
Jaeger, Heinrich M.
ade31874-6896-4cfa-9ca3-6ac1abffc770
Klein Schaarsberg, Martin H.
a836ae61-3890-4c34-a942-ea370e4d9413
Peters, Ivo R.
222d846e-e620-4017-84cb-099b14ff2d75
Stern, Menachem
435a6d0e-564a-408f-a7bb-7079e2805f41
Dodge, Kevin
c30787eb-4bd1-488a-b355-e3eb59e8c8b8
Zhang, Wendy W.
85d8f2da-b0a6-4e5e-90ac-38a0dda7c352
Jaeger, Heinrich M.
ade31874-6896-4cfa-9ca3-6ac1abffc770

Klein Schaarsberg, Martin H., Peters, Ivo R., Stern, Menachem, Dodge, Kevin, Zhang, Wendy W. and Jaeger, Heinrich M. (2016) From splashing to bouncing: The influence of viscosity on the impact of suspension droplets on a solid surface. Physical Review E, 93 (62609), 1-7. (doi:10.1103/PhysRevE.93.062609).

Record type: Article

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.

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Accepted/In Press date: 16 May 2016
e-pub ahead of print date: 14 June 2016
Published date: 14 June 2016
Organisations: Aerodynamics & Flight Mechanics Group

Identifiers

Local EPrints ID: 396897
URI: http://eprints.soton.ac.uk/id/eprint/396897
ISSN: 1539-3755
PURE UUID: d768c93c-9a1c-4cf0-a85a-b07fc47b38c4
ORCID for Ivo R. Peters: ORCID iD orcid.org/0000-0002-3549-3322

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Date deposited: 16 Jun 2016 09:32
Last modified: 15 Mar 2024 03:52

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Contributors

Author: Martin H. Klein Schaarsberg
Author: Ivo R. Peters ORCID iD
Author: Menachem Stern
Author: Kevin Dodge
Author: Wendy W. Zhang
Author: Heinrich M. Jaeger

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