September 25, 2015, 3:30 - 5:00 pm
1502 Patrick F. Taylor Hall


EPIC Seminar Series

Enabling Process Innovation through Computation

Attend in person at: 1502, Patrick Taylor Hall, Louisiana State University

Attend online at:

Date: 09/25/2015

Time: 3:30 p.m.

Title: Filtered two-fluid models for fluidized gas-particle suspensions

Speaker: Sankaran Sundaresan

Affiliation: Department of Chemical & Biological Engineering, Princeton University


Gas-particle flows in turbulent fluidized beds and risers exhibit large fluctuations in velocities and local suspension density. These fluctuations are associated with the random motion of the individual particles and with the chaotic motion of particle clusters. These clusters occur over a wide range of length scales and their dynamics span a broad range of time scales. This broad range of scales has made it difficult to construct efficient flow models required for practical analysis of flows in turbulent fluidized beds and risers. Our research seeks to develop filtered hydrodynamic models for such systems.

Constitutive relations for the drag coefficient and particle phase stresses appearing in the filtered model equations have been formulated by systematically filtering the computational data generated through highly resolved simulations of fluidized suspensions in simple flow geometries. These will be described in the presentation, along with our efforts to validate the approach against experimental data.

About the speaker

Prof. Sundaresan received his Ph.D. in Chemical Engineering from the University of Houston in 1980, and joined the faculty at Princeton University. At Princeton, he has studied different classes of multiphase flows - trickle bed reactor hydrodynamics, fluid-particles flows, and bubble dynamics in gas-liquid bubble column reactors. Through a combination of experiments, simulations and theory, his research group has studied the origin of instabilities and the hierarchy of non-uniform structures that arise in granular flows and multiphase flows. The current emphasis of his work is on fluid-solid flows, some of which he will touch upon in today’s presentation.