School of Mechanical & Systems Engineering
Seminar Series: 2009/2010

"Particle-Turbulence Interactions"

Dr Luis Portela
(Delft University of Technology)

Thursday 5 November 2009
4pm, Stephenson Building, room F16 (first floor)

Turbulent particle-laden flows occur in numerous situations both in industrial and environmental processes. In order to understand and model these flows it is important to understand the dynamics of the interaction between the particles and the turbulence. The turbulence determines the temporal and spatial distribution of the particles, leading to the formation of complex particle-patterns, which in turn influence the turbulence dynamics and promote a modification of its structure. 

Dr Portela will give an overview of the dynamics of particle-turbulence interactions and the interplay of the different coupling mechanisms, using two key paradigms: homogeneous isotropic turbulence and wall-bounded turbulence.  He will present some results of his research on the fundamental aspects of the formation and dynamics of particle-patterns and on the turbulence modification by the particles, and discuss its implications for modeling, scaling laws and engineering simulation approaches.  He will also present some results of his research on practical applications in industrial and environmental flows: gas-solid flows in pipelines, droplets in annular flow, droplets in clouds and its implications for rain formation, and sediment transport in rivers and oceans.

Luís Portela holds an Engineering degree and a MSc degree in Mechanical Engineering from the Pontifical Catholic University of Rio de Janeiro, and a PhD degree in Mechanical Engineering from Stanford University. Before his PhD, where he pursued research on Vortices in Turbulent Flows, he worked at the Petrobras Research Center, in Rio de Janeiro, on Multiphase Flows. Currently, he is Assistant Professor at Delft University of Technology, where the main focus of his research is on Turbulent Multiphase Flows. At Delft University, he is responsible for the courses Computational Multiphase Flow, and Applied Multiphase Flow.