Start
Jul 14, 2015 - 17:00
End
Jul 14, 2015 - 18:00
Venue
Room 230 Chemical Engg.
Event Type
Speaker
Dr.Ashish Bhateja PhD Student IIT Kanpur.
Title
A novel mechanism governing segregation in horizontally shaken granular mixtures
Abstract : The constituents of an energized granular mixture tend to separate due to difference in their size and/or density. Segregation in spite of being an important and seemingly simple phenomenon is difficult to explain both because of the interplay of various parameters governing the segregation process and because granular materials do not have a well understood constitutive law. In this work I will present experimental and numerical investigation of a novel segregation process wherein a granular mixture separates axially when shaken horizontally in a Christmas-tree shaped channel consisting of several concatenated trapezoidal sections. The channel is kept horizontal so that its base aligns normal to gravity. The channel ends are closed. A binary mixture kept in the channel segregates to its opposite ends upon shaking. The segregation process is extremely robust and is able to separate all varieties of food grains. Even multiple component granular mixtures consisting of more than two kinds of grains have been successfully segregated. In addition I will discuss scaling of granular temperature with peak vibrational velocity in vibrated granular media and present how our study reconciles previous disparate experimental computational and theoretical results.Bio: Ashish Bhateja graduated with a PhD this past December in Mechanical Engineering from IIT Kanpur. He obtained M.Tech. and B.Tech. in Mechanical Engineering from IIT Kanpur and MDU Rohtak in 2008 and 2006 respectively. During his PhD he focused on understanding segregation in shaken granular mixtures via experiments and discrete element simulations. His current area of research is granular mechanics.