Levich Institute Seminar Announcement, 12/07/2004

Tuesday, 12/07/2004
2:00 PM
Steinman Hall, Room #312
(Chemical Engineering Conference Room)

Dr. Thomas C. Halsey
ExxonMobil Research and Engineering Resource Sciences Laboratory
Corporate Strategic Research


"Dense Granular Flows"

(This is a CCNY/Columbia NSF-IGERT Soft Materials Seminar)

ABSTRACT

Non-thermal yet disordered, strongly dissipative yet rigid, the mechanics of packings of grains has fascinated physicists and engineers at least since the time of Coulomb. This talk will focus on one of the classical problems in this field, the behavior of dense granular flows driven by gravity. I will give examples of such flows drawn from geophysics, and then introduce some of the ideas of Ralph Bagnold, who developed the concepts on which the modern study of granular flows are based. A systematic phenomenology of dense granular flows down inclines has recently been developed, based both on numerical work and on experiments. This phenomenology emphasizes the role of inelastic collapse in controlling the rheology of these flows, and hints at the structure of an ultimate theory of dense flows.