Contact spreading of liquid between particles in mixed granular systems
Professor of Mechanics and Professor of Industrial & Physical Pharmacy, Purdue University
The spreading of liquid through particle-particle contacts is an important physical process in some particle processing unit operations. For example, in particle coating or wet granulation operations, the transfer of liquid between particles can be a significant mechanism for wetting particles uniformly, especially for viscous coating liquids that cannot be easily sprayed. If a subset of particles is initially wetted in an otherwise dry system of particles, it is critical that the particles mix well so that liquid can be transferred between particles to produce a uniformly wetted system. This talk presents discrete element method models, population balance models, and experiments to investigate liquid contact spreading between particles. The models accurately predict trends that are observed experimentally and identify the parameters that significantly affect contact spreading.
Carl Wassgren is a Professor of Mechanical Engineering and Industrial and Physical Pharmacy (by courtesy) at Purdue University, West Lafayette, Indiana. His core research interest is the application of computational mechanics principles to study the behavior of bulk granular material. He has more than two decades of experience in advanced numerical simulations for predicting the flow and compaction of powders in particulate manufacturing processes, such as those found in the pharmaceutical, food, and chemical industries. He has served as the primary advisor for 38 graduate students and as an advisory committee member on dozens of other students’ committees. He has been an invited speaker to many industrial, educational, and government organizations. He has published 90 archival journal articles and authored more than 150 conference presentations. He has received a number of awards for both research and teaching activities, including the National Science Foundation’s CAREER award, Purdue University’s Charles B. Murphy Outstanding Undergraduate Teaching award (Purdue University’s highest teaching honor), and entry into Purdue’s Book of Great Teachers. Currently, he serves as the Director of Purdue University’s Center for Particulate Products and Processes.