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Article Dans Une Revue Physical Review Fluids Année : 2022

Viscous resuspension of droplets

Résumé

Using absorbance measurements through a Couette cell containing an emulsion of buoyant droplets, volume fraction profiles are measured at various shear rates. These viscous resuspension experiments allow a direct determination of the normal stress in the vorticity direction in connection with the suspension balance model that has been developed for suspensions of solid particles. The results unambigously show that the normal viscosity responsible for the shear-induced migration of the droplets is independent on the capillary number, implying that particle deformation does not play a major role. It is similar to that of rigid particles at volume fractions below 40% but much smaller at higher ones.
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Dates et versions

hal-03376433 , version 1 (13-10-2021)
hal-03376433 , version 2 (30-01-2022)

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Mehdi Maleki, Clément de Loubens, Hugues Bodiguel. Viscous resuspension of droplets. Physical Review Fluids, 2022, 7, pp.L011602. ⟨10.1103/PhysRevFluids.7.L011602⟩. ⟨hal-03376433v2⟩

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