A New Perspective on Shear Thickening of Dense Suspensions
Event details
| Date | 25.03.2014 |
| Hour | 14:00 › 15:00 |
| Speaker | Prof. Heinrich M. Jaeger, University of Chicago |
| Location | |
| Category | Conferences - Seminars |
Dense suspensions of particles in a liquid exhibit a number of counterintuitive, non-Newtonian flow behaviors. Most remarkably, the application of stress can dramatically harden the material, transforming it from a liquid state at rest into a solid-like state when driven strongly. Shear-thickening-based models developed over the last 25 years cannot explain the observed large normal stresses (large enough to support a grown person's weight when running across a pool filled with a suspension such as cornstarch in water). This talk surveys some of the key issues, discusses the stress scales associated with shear thickening in dense suspensions, and outlines a new scenario for impact response. In particular, using high-speed video and x-ray imaging during sudden impact, we are able to link the nonlinear suspension dynamics in a new way to the jamming phase transition.
Bio: Heinrich Jaeger is the William J. Friedman and Alicia Townsend Professor of Physics at the University of Chicago. He received his Ph.D. in physics in 1987, under Allen Goldman at the University of Minnesota, working on ultrathin superconducting films. After a postdoc at the University of Chicago 1987-89, Jaeger spent two years at the Centre for Submicron Technology of the University of Delft in The Netherlands. He has been on the faculty at Chicago since 1991, directing the Chicago Materials Research Center from 2001 – 2006, and the James Franck Institute from 2007-2010. Jaeger’s current research focuses on investigations of self-assembled nanoparticle-based structures, on the rheology of dense suspensions, and on studies of the packing and flow of granular materials.
Bio: Heinrich Jaeger is the William J. Friedman and Alicia Townsend Professor of Physics at the University of Chicago. He received his Ph.D. in physics in 1987, under Allen Goldman at the University of Minnesota, working on ultrathin superconducting films. After a postdoc at the University of Chicago 1987-89, Jaeger spent two years at the Centre for Submicron Technology of the University of Delft in The Netherlands. He has been on the faculty at Chicago since 1991, directing the Chicago Materials Research Center from 2001 – 2006, and the James Franck Institute from 2007-2010. Jaeger’s current research focuses on investigations of self-assembled nanoparticle-based structures, on the rheology of dense suspensions, and on studies of the packing and flow of granular materials.
Practical information
- Informed public
- Free
Organizer
- Marco Ramaioli (ENAC/IIC/LHE, Nestlé)
Contact
- Marco Ramaioli
Christophe Ancey