New paper: Dynamic viscoplastic granular flows: A persistent challenge in gas-solid fluidization

24 May 2019

At a macroscopic scale, Eulerian models based on the Kinetic Theory of Granular Flow (KTGF) have been successfully employed to simulate dilute and moderately dense systems. However, their applications to dense flows are challenging. In recent years, tremendous effort has been devoted to finding new ways to describe the effects of sustained solids friction and dense flow rheology. This article provides a perspective on this matter from the viewpoint of gas-solid fluidization and discusses advances in describing the dilute-to-dense transition in a continuum framework. While the reliability of the advanced models is still far from that of a Eulerian-Lagrangian approach, they lay a promising foundation for developing a rigorous description of granular media that merges the classical frameworks of continuous fluid and soil mechanics. Ultimately, combining both is a prerequisite to developing new solid stress models that will improve not only the performance of macroscopic models, but also our understanding of granular physics.
 
The new paper titled, ‘Dynamic viscoplastic granular flows: A persistent challenge in gas-solid fluidization’, has been published in the Powder Technology journal.
 
Authors – Kaiqiao Wu, Victor Francia, Marc-Olivier Coppens

New paper: Dynamic viscoplastic granular flows: A persistent challenge in gas-solid fluidization