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seminaire P. Pepiot

13 février 2017

Investigating chemical processes in reactive particle-laden flows

Perrine Pepiot, Dept Mechanical and Aerospace Engineering, Cornell Univ, USA.

lundi 20 à 14h30 Amphithéâtre Nougaro

Résumé :

Accounting adequately for the chemical processes and their interactions with the surrounding granular flow dynamics is an essential step toward predictive CFD simulations of gas-solid conversion reactors. Taking biomass thermochemistry conversion to biofuel as an application, this talk presents the numerical framework we are developing for the simulation of small-scale conversion units, with a strong emphasis on the chemical models used to describe the chemistry, here, the biomass devolatilization and subsequent gas phase chemistry. The direct implementation of a detailed kinetic description, involving a large number of chemical species and elementary reactions, is prohibited due to computational cost. Therefore, a systematic strategy that extends existing chemistry reduction techniques to gas-solid systems is proposed to r reduced the complexity of the models. The resulting chemical schemes are then integrated into a Lagrangian particle tracking tool coupled with the LES/DNS code NGA, and used to investigate a variety of conversion configurations, from fluidized bed to riser reactors.

Dr. Pepiot has a PhD and a MS in Mechanical Engineering from Stanford University, and a MS in Aerospace Engineering from the Ecole Nationals Supérieure de l’Aeronautique et de l’Espace (Supaéro) in Toulouse, France. Prior to joining the Cornell faculty in 2011, Dr. Pepiot was a research scientist at the National Renewable Energy Laboratory in Golden, Colorado, leading the Biomass Gasification Process Modeling and Optimization Task. Dr. Pepiot’s main interest is in developing new modeling and computational tools to improve the description of complex chemical processes in CFD simulations of energy systems, including combustion and reactive particle-laden flows. She is the recipient of a 2017 NSF CAREER award, the 2013 James M. And Marsh D. McCormick Excellence in Advising Award and of the 2014 « John Swanson ’61 ME in honor of his mother, Dorothy G. Swanson » Excellence in Teaching award.