Friday, February 28, 2020
4:30 PM - 6:00 PM (ET)
Event Type
Lecture
Contact
Distinguished Visitors Program
Link
https://ems-web.haverford.edu/MasterCalendar/EventDetails.aspx?EventDetailId=87768
Distinguished Visitor Kerstin Nordstrom, Clare Boothe Luce Assistant Professor of Physics, Mount Holyoke College
We will begin with a review of the phenomenology of gravity-driven flow and clogging in a silo geometry, and outstanding problems. We will then present work on two thrusts related to these problems. Prior work has shown that the placement of an obstacle near the exit can suppress clogging. We extend these observations for a wider array of intruder size and location. Using particle tracking and high-speed video, we analyze the local particle motions and packings to better understand the causes of the clog suppression. We find the mechanisms of clog suppression depend on the intruder size and placement: while the granular temperature appears to be important in all cases, large intruders create spatial disorder that percolates through the system. A second thrust has been to distinguish clogging from the jamming transition in a meaningful way. We find that several mesoscale metrics that changed on approach to jamming also exhibit interesting behavior near the clogging transition, however, the trends are markedly distinct from jamming.
Tea at 4:15 p.m.
Sponsored by the Department of Physics in conjunction with the Provost's Office