Impact of a Liquid Drop on a Granular Medium: inertia, viscosity and surface tension effects on the drop deformation

An experimental study of liquid drop impacts on a granular medium is proposed. Four fluids were used to vary physical properties: pure distilled water, water with glycerol at 2 concentrations 1:1 and 1:2 v/v and water with Tween 20 at the concentration of 0.1g/l. The drop free fall height was varied...

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Bibliographic Details
Published in:arXiv.org 2010-09
Main Authors: Nefzaoui, Elyes, Skurtys, Olivier
Format: Article
Language:English
Subjects:
Absorption
Computational fluid dynamics
Deformation effects
Distilled water
Drops (liquids)
Free fall
Granular materials
Granular media
Kinetic energy
Morphology
Physical properties
Surface chemistry
Surface tension
Viscosity
Weber number
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Summary:An experimental study of liquid drop impacts on a granular medium is proposed. Four fluids were used to vary physical properties: pure distilled water, water with glycerol at 2 concentrations 1:1 and 1:2 v/v and water with Tween 20 at the concentration of 0.1g/l. The drop free fall height was varied to obtain a Weber number (We) between 10 and 2000. Results showed that obtained crater morphologies highly depend on the impacting drop kinetic energy E_{K}. Different behaviours during the drop spreading, receding and absorption are highlighted as function of the fluids viscosity and surface tension. Experimental absorption times are also commented and compared with a simplified theoretical model. Drops maximal extensions and craters diameters were found to scale as \(We^{1/5}\) and \(E_K^{1/5}\) respectively. In both cases, found dependencies are smaller than those reported in literature: \(We^{1/4}\) for drop impacts on solid or granular surfaces and \(E_K^{1/4}\) for spherical solid impacts on granular media.
ISSN:2331-8422
DOI:10.48550/arxiv.1009.1806