Shear flows

Sunday, April 11, 2010 - 3:00pm - 4:30pm
William Young (Scripps Research Institute)

(1) interaction of molecular diffusion with simple
unidirectional shear flows (bounded and unbounded domains).

(2) Limitation of the effective diffusion approximation to
long times and small domains, and low moments of the tracer

(3) Perhaps a geophysical example: shear diffusion in the
internal gravity wave field. The vertical tracer cascade of
Haynes & Anglade.

Wednesday, February 24, 2010 - 3:30pm - 4:15pm
Zhiwu Lin (Georgia Institute of Technology)
Keywords: Couette flow, Sommerfeld paradox, inviscid damping
Wednesday, October 14, 2009 - 11:00am - 11:40am
Yuriko Renardy (Virginia Polytechnic Institute and State University)
No Abstract
Tuesday, October 13, 2009 - 3:30pm - 4:10pm
Lynn Walker (Carnegie-Mellon University)
Keywords: Block copolymer solutions, hydrogels, shear aligned, soft crystals
Friday, September 18, 2009 - 1:50pm - 2:35pm
Suzanne Fielding (University of Durham)
I will summarise some recent progress modelling shear banding in complex fluids, focussing particularly on the following topics: bulk and interfacial instabilities that lead to complex dynamics of the bands; vorticity banding; and 3D roll-like flows. Time permitting, I will also discuss a novel kind of shear banding that has recently been predicted in biologically active suspensions.
Friday, September 18, 2009 - 1:00pm - 1:45pm
Sandra Lerouge (Université de Paris VII (Denis Diderot))
Under shear, complex fluids often undergo instabilities leading to new flow patterns. Shear-banding is such a flow-induced instability, observed in many systems of various microstructures from surfactants and polymer solutions, to liquid crystal polymers, emulsions, granular materials and foams. It results from the coupling between the flow and the mesoscopic architecture of the system. The flow changes the structure of the fluid that feeds back on the flow itself.
Tuesday, September 15, 2009 - 11:00am - 11:45am
Norman Wagner (University of Delaware)
Measurements of the microstructure commensurate with the viscosity and normal stress differences in shearing colloidal suspensions provides an understanding of how to control the viscosity, shear thinning, and shear thickening rheological behavior typical of concentrated dispersions. In this presentation, I will review some of the experimental methods and key results concerning the micromechanics of colloidal suspension rheology.
Monday, October 17, 2005 - 11:20am - 12:10pm
James Greenleaf (Mayo Clinic)
Detecting pathology using the stiffness of the tissue is more that 2000 years old. Even today it is common for surgeons to feel lesions during surgery that have been missed by advanced imaging methods. Palpation is subjective and limited to individual experience and to the accessibility of the tissue region to touch. It appears that a means of noninvasively imaging elastic modulus (the ratio of applied stress to strain) may be useful to distinguish tissues and pathologic processes based on mechanical properties such as elastic modulus.
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