Department Seminars: Multi-Scale Multiphase Transport Phenomena In Spray Drying Processes

Speaker Professor Avi Levy Department of Mechanical Engineering, Ben-Gurion University of the Negev

Host Department of Chemical and Biomolecular Engineering

Date/Time 02 Apr - 02 Apr, 10.00AM

Venue E5-02-32 , Faculty of Engineering, National University of Singapore


Spray drying is a complex technological process involving multiphase flows with transport phenomena on many scales. In fact, spray drying technique converts soft matter (solutions, suspensions) into a hard matter (dry particles) by injecting droplets of the former into a hot gaseous agent. There are inter-phase, intra-phase and phase-boundary interaction phenomena. The inter-phase transport phenomena comprise mixing of continuous and dispersed phases (gas-droplets and gas-particles). The intra-phase processes involve gas dynamics, transport phenomena within the droplets and particles, as well as droplet-droplet, particle-particle and droplet-particle collisions. The phase-boundary interactions are also important and include droplet-wall, particle-wall and gas-wall interference.

The presentation summarizes achievements and results of the comprehensive scientific research on spray drying undertaken by our research group starting from the droplet level, considering drying kinetics, morphology and microstructure formation of particle and continue with the full process level, including modelling and simulation of droplet-droplet and particle-particle collisions. Verification and validation by experimental measurements is also discussed.


Prof. Avi Levy serves as the Dean of the Engineering Sciences Faculty. He studied Mechanical Engineering at Ben-Gurion University of the Negev, ISRAEL. He got his Ph.D. in 1995 from the same university. He worked as a research scholar in the above university until 1995 and as a research fellow at Glasgow Caledonian University in the Center for Industrial Bulk Solids Handling until 1997. Then he joined to the department of Mechanical Engineering at Ben-Gurion University of the Negev, ISRAEL, where he serves as the Head of Department. On 2004 he served as a Visiting Professor in the Canadian Hydraulics Centre, National Research Centre Canada. Prof. Levy published over 125 scientific papers, 28 chapters in books and presents over 160 papers in scientific conferences. His area of main interest centers on ‘transport phenomena in multiphase media’, ‘pneumatic conveying’, 'drying', ‘mass momentum and heat transfer’, 'heat pumps', 'bubble pumps', ‘diffusion absorption refrigeration systems’ and ‘Shock wave interaction with porous and granular materials.