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Theses

Ecoulements de fluides complexes en géométries microfluidiques

Abstract : We develop optical measurements inside microchannels of varying geometries and perform new characterizations of different complex fluids of interest for enhanced oil recovery. Our work relies on a new pressure resistant microfabrication technique based on photocurable materials. We design first a lab on a chip to study polymer degradation under flow. Integration of a zone of extreme flows and a viscosimeter helps us to get a lot of data on the role of mass, concentration, chemistry and flow geometry. Thanks to local velocity measurements inside a microchannel, we are able to characterize the out of equilibrium phase of a semi-dilute wormlike micelles solution over more than one decade of shear rates and measure independently the slippage. Finally three dimensional imaging of the same flow reveals structures specific to shear-banding fluids: an amplified confinement effect and an interface instability. These observations compare to a theoretical model with good agreement.
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https://pastel.archives-ouvertes.fr/pastel-00005605
Contributor : Ecole Espci Paristech <>
Submitted on : Tuesday, December 29, 2009 - 8:00:00 AM
Last modification on : Saturday, September 26, 2020 - 11:44:07 PM
Long-term archiving on: : Friday, September 10, 2010 - 2:55:52 PM

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  • HAL Id : pastel-00005605, version 1

Citation

Philippe Nghe. Ecoulements de fluides complexes en géométries microfluidiques. Sciences de l'ingénieur [physics]. Université Pierre et Marie Curie - Paris VI, 2009. Français. ⟨pastel-00005605⟩

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