Start
Feb 26, 2018 - 15:00
End
Feb 26, 2018 - 16:00
Venue
Rm. No. 118 Ground floor Chemical Engg. Dept.
Event Type
Speaker
Prof. Anugrah Singh IIT Guwahati
Title
Rheology and Dynamics of Binary Suspensions
Abstract: Dynamics of binary suspension comprising of rigid rods and spheres in wall bounded flow at low Reynolds number were studied using the Stokesian dynamics simulations. We demonstrate that hydrodynamic interaction of a rod with a sphere in wall bounded shear flow can lead to margination of sphere towards the wall. Effect of relative particle concentration and shear rate on the microstructure and rheology of suspension was studied in the simple shear flow. The concentration profiles of spheres and rods were similar to the previous studies with suspension of RBCs and platelets in blood flow. The average angular velocities of the particles was observed to decrease with the increase in the concentration of rods. This results into overall rise in the suspension viscosity and the first normal stress difference. In the case of the pressure driven flow a single sphere in the suspension of rods displays margination towards the wall only at moderate concentration. On the other hand a rod in the suspension of spheres always migrates towards the center of the channel. The margination and migration of spheres in the pressure driven flow depends on its relative concentration with respect to the rods.Bio: Dr. Anugrah Singh is presently working as Professor in the department of chemical engineering at the Indian Institute of Technology Guwahati. He joined the IITG in 2004. Prior to joining IIT Guwahati he worked as post-doctoral fellow at the Israel Institute of Technology Technion Israel. He was awarded IUSSTF fellowship in 2010 and was a Visiting Associate at the California Institute of Technology USA in 2011. He has also worked as CFD application engineer at Fluent India Pvt. Ltd. (now ANSYS) during 2000-2003. Dr. Singh obtained his PhD in chemical engineering in the year 2000 from the Indian Institute of Science Bangalore. His research interests are focused on studying the rheology and dynamics of suspension flow using the experimental techniques and computational fluid dynamics simulations.