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FORMATION, FRAGMENTATION ET ETATS OSCILLANTS DE GOUTTELETTES MULTILAMELLAIRES

Abstract : In this work, we investigate the effect of shear flow on membrane phases. Due to their large characteristic length scales, these complex fluids present strong couplings between their structure and the flow. Multilamellar vesicles can be formed upon shearing lamellar phases and lamellar/sponge mixtures. In the first case, (“Onion Texture”), the vesicle size is monitored by elasticity whereas in the second system, the mean size results from a balance between capillary and viscous forces (“Taylor's Droplets”). However, despite these differences, in both systems we show that the formation of vesicles which is a strain controlled process seems monitored by a primary buckling instability of the lamellae under flow. Then, we study the fragmentation under flow of the Taylor's droplets. We show that the rupture process which does not require any elongation of the droplets seems triggered by an instability of the inner structure droplet. Finally, experimental observations of droplet size sustained oscillations are reported. A possible mechanism for such kinds of oscillations is discussed.
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https://tel.archives-ouvertes.fr/tel-00007511
Contributor : Laurent Courbin <>
Submitted on : Thursday, November 25, 2004 - 12:28:22 AM
Last modification on : Monday, January 22, 2018 - 11:02:02 AM
Long-term archiving on: : Friday, April 2, 2010 - 9:19:13 PM

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Laurent Courbin. FORMATION, FRAGMENTATION ET ETATS OSCILLANTS DE GOUTTELETTES MULTILAMELLAIRES. Dynamique des Fluides [physics.flu-dyn]. Université Sciences et Technologies - Bordeaux I, 2004. Français. ⟨tel-00007511⟩

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