Rheology of Non-Brownian Particle Suspensions

Friday, October 4, 2013 ( 2:00 pm to 3:00 pm )

Location: Babbio 310, Stevens Institute of Technology

Nancy Webb, nwebb@stevens.edu

Morton M. Denn

Benjamin Levich Institute and Departments of Chemical Engineering and Physics

City College of New York



Concentrated particle suspensions are ubiquitous in applications. Concentrated suspensions of spherical particles in Newtonian fluids represent the most elementary case, and even here the behavior is unexpected. Despite the fact that particle Reynolds numbers are typically very low, in which case the underlying equations describing motion are linear, shear thinning, shear thickening, and finite normal stress differences are observed, all of which are non-linear phenomena. We review the observed behavior of non-Brownian suspensions and the current state of understanding, with a focus on the development of continuum constitutive equations suitable for simulation. Our recent results on particle-level simulation at concentrations where particle-particle contact is believed to be a major factor show the development of a “shear-jammed” state and force chains reminiscent of those seen in dry granular systems and may indicate the direction to the construction of a continuum description.  



Morton M. Denn is the Albert Einstein Professor of Science and Engineering, Distinguished Professor of Chemical Engineering, Professor of Physics, and Director of the Benjamin Levich Institute for Physico-Chemical Hydrodynamics at the City College of New York. Prior to joining CCNY in 1999, he was Professor of Chemical Engineering at the University of California, Berkeley, where he served as Department Chair, as well as Program Leader for Polymers and Head of Materials Chemistry in the Materials Sciences Division of the Lawrence Berkeley National Laboratory. He previously taught chemical engineering at the University of Delaware, where he was the Allan P. Colburn Professor.

Professor Denn was the Editor of AIChE Journal from 1985 to 1991 and the Editor of the Journal of Rheology from 1995 to 2005. He is a recipient of a Guggenheim Fellowship; a Fulbright Lectureship; the Professional Progress, William H. Walker, Warren K. Lewis, Institute Lectureship, and Founders Awards of the American Institute of Chemical Engineers; the Chemical Engineering Lectureship of the American Society for Engineering Education; and the Bingham Medal and Distinguished Service Awards of the Society of Rheology. He is a member of the National Academy of Engineering and the American Academy of Arts and Sciences, and he received an honorary D.Sc. from the University of Minnesota. He is the author of over 200 technical papers and book chapters and seven books: Optimization by Variational Methods, Introduction to Chemical Engineering Analysis (as coauthor), Stability of Reaction and Transport Processes, Process Fluid Mechanics, Process Modeling, Polymer Melt Processing, and Chemical Engineering: An Introduction