Theory of the flow of an elastoviscoplastic medium

Tyabin, N. V.; Trusov, S. A.

doi:10.1007/bf00827846

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Choice Of the Rheology1

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2009

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“…Constitutive laws for viscoplastic fluids that incorporate elasticity have been the subjects of several studies in the past (e.g. Schwedoff 1890;Tyabin & Trusov 1970;White 1979). Recently, there has been a renewal of such elasto-viscoplastic formulations applied to the rheology of soft disordered materials such as foams, emulsions and gels (Takeshi & Sekimoto 2005;Marmottant & Graner 2007;Saramito 2007;Bénito et al 2008).…”

Section: Choice Of the Rheologymentioning

confidence: 99%

Drop impact of yield-stress fluids

2009

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International audienceThe 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

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