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Plateaux de contrainte et bandes de cisaillement dans les fluides complexes

Abstract : A number of complex fluids present stress plateaus in the measured flow curves. On this plateau, shear banding is sometimes observed. We study three surfactant solutions that all exhibit a plateau of the stress as a function of the shear rate. The experimental techniques used : rheology, velocity profiles measured by MRI, and birefringence experiments, reveal three different origins for the three plateaus. The first system, wormlike micelles in the semi-dilute regime show the development of a birefringent and highly sheared band on the plateau whose extension grows with increasing shear rate. For the second solution, a lamellar phase with an onion texture, shows vorticity banding on the horizontal plateau. For the third system, wormlike micelles in the dilute regime, we show that the stress plateau is due to wall slip. The drag reduction observed for this system is found to be due to wall slip also.
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Contributor : Julie Drappier <>
Submitted on : Thursday, April 15, 2004 - 3:18:18 PM
Last modification on : Thursday, December 10, 2020 - 12:37:22 PM
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  • HAL Id : tel-00005909, version 1


Julie Drappier. Plateaux de contrainte et bandes de cisaillement dans les fluides complexes. Dynamique des Fluides [physics.flu-dyn]. Université Paris-Diderot - Paris VII, 2004. Français. ⟨tel-00005909⟩



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