Levich Institute Seminar Announcement, 10/28/2014
Tuesday, 10/28/2014
2:00 PM
Steinman Hall, Room #312
(Chemical Engineering Conference Room)

Professor Wilson Poon
University of Edinburgh
School of Physics and Astronomy

"Bridging the Gap - from Colloidal to Granular Rheology"

ABSTRACT


While the rheology of suspensions of colloidal and granular particles is separately reasonably well understood, the deformation and flow of suspensions containing particles in the intermediate size range (say, 1 to 10 microns) has not bee systematically studied. Using well- characterised hard-sphere-like particles in this size range, we show that shear thickening renders it impossible to scale their size-dependent rheology onto a single master curve. Nevertheless, we can offer a unified, predictive model of size effects. We also confirm recent theory and simulations that shear thickening is due to transition between two ‘viscosity branches’.

BRIEF ACADEMIC/EMPLOYMENT HISTORY

B.A. and Ph.D. from Cambridge University. Been on faculty of Edinburgh University since 1990. Professor of Condensed Matter Physics since 1999. Elected to Fellowship of the Royal Society of Edinburgh in 2004 (the RSE is the national academy of Scotland).

RECENT RESEARCH INTERESTS

Suspension rheology, bacterial motility, bacterial colony growth



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