Drop Formation in Non-Newtonian Fluids

Mounir Aytouna (1) , Jose Paredes (1) , Noushine Shahidzadeh-Bonn (1) , Sébastien Moulinet (2) , Christian Wagner (3) , Yacine Amarouchene (4) , Jens Eggers (5) , Daniel Bonn (1, 2)

1 Soft Matter Group - Amsterdam
2 LPS - Laboratoire de Physique Statistique de l'ENS
3 ExperimentalPhysik
4 LOMA - Laboratoire Ondes et Matière d'Aquitaine
5 Department of Mathematics [Bristol]

We study the pinch-off dynamics of droplets of yield stress and shear thinning fluids. To separate the two non-Newtonian effects, we use a yield stress material for which the yield stress can be tuned without changing the shear thinning behavior, and a shear thinning system (without a yield stress) for which the shear thinning can be controlled over a large range, without introducing too much elasticity into the system. We find that the pinch-off remains very similar to that of constant viscosity Newtonian liquids, and consequently thinning in shear flow does not imply a thinning in elongational flow.

Mots clés: Non-Newtonian fluid flows; Drops and bubbles; Extensional flow and combined shear and extension

Domaines: Dynamique des Fluides [physics.flu-dyn]

Mounir Aytouna, Jose Paredes, Noushine Shahidzadeh-Bonn, Sébastien Moulinet, Christian Wagner, et al.. Drop Formation in Non-Newtonian Fluids. Physical Review Letters, 2013, 110 (3), pp.34501. ⟨10.1103/PHYSREVLETT.110.034501⟩. ⟨hal-00793062⟩