Skip to Main content Skip to Navigation
Theses

Ecoulement d'une phase lamellaire lyotrope : rhéochaos, systèmes dynamiques et vélocimétrie locale

Abstract : This experimental work deals with the effect of shear on a lyotropic lamellar phase, and more precisely with a shear-induced transition. In the vicinity of this transition, dynamical behaviors are observed: under controlled stress, the structure of the fluid and the measured shear rate display oscillations characterized by a large period of time (about 10 minutes). This temporal instability, recently coined "rheochaos", has been analyzed using dynamical system theory. This study demonstrate that the observed dynamics cannot be accounted for by a low dimensional deterministic dynamical system. We confirm such a result by studying the flow near the transition, with the help of a local velocimetry method based on heterodyne dynamic light scattering. These experiments reveal that the measured dynamics are due to the presence of spatio-temporal structures in the flow field.
Complete list of metadata

https://tel.archives-ouvertes.fr/tel-00003913
Contributor : Jean-Baptiste Salmon <>
Submitted on : Friday, December 5, 2003 - 5:30:06 PM
Last modification on : Thursday, November 5, 2020 - 6:18:02 PM
Long-term archiving on: : Friday, April 2, 2010 - 7:26:11 PM

Identifiers

  • HAL Id : tel-00003913, version 1

Collections

Citation

Jean-Baptiste Salmon. Ecoulement d'une phase lamellaire lyotrope : rhéochaos, systèmes dynamiques et vélocimétrie locale. Dynamique des Fluides [physics.flu-dyn]. Université Sciences et Technologies - Bordeaux I, 2003. Français. ⟨tel-00003913⟩

Share

Metrics

Record views

293

Files downloads

449