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Article Dans Une Revue Journal of Fluid Mechanics Année : 2009

Drop impact of yield-stress fluids

Résumé

The normal impact of a drop of yield-stress fluid on a flat rigid surface is investigated experimentally. Using different model fluids (polymer microgels, clay suspensions) and impacted surfaces (partially wettable, super-hydrophobic), we find a rich variety of impact regimes from irreversible viscoplastic coating to giant elastic spreading and recoil. A minimal model of inertial spreading, taking into account an elasto-viscoplastic rheology, allows explaining in a single framework the different regimes and scaling laws. In addition, semi-quantitative predictions for the spread factor are obtained when the measured rheological parameters of the fluid (elasticity, yield stress, viscosity) are injected into the model. Our study offers a means to probe the short-time rheology of yield-stress fluids and highlights the role of elasticity on the unsteady hydrodynamics of these complex fluids.

Dates et versions

hal-01432118 , version 1 (11-01-2017)

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Li-Hua Luu, Yoel Forterre. Drop impact of yield-stress fluids. Journal of Fluid Mechanics, 2009, 632, ⟨10.1017/S0022112009007198⟩. ⟨hal-01432118⟩
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