The effects of turbulence on nanoparticle growth
Sean C. Garrick.University of Minnesota.
Minneapolis, USA.
Monday, March 22, 14:00 CERFACS Conference Room
Abstract
The formation of very fine particles from vapor encompasses a large number of physical/chemical phenomena.One must deal with vapor phase chemistry, nucleation and subsequent growth (coagulation/coalescence). A key issue in dealing with the formation of nanoscale particles is agglomerates and chemical control. Soot particles, for example, are more often than not comprised of chains of nanoparticles In the manufacture of nano-structured materials agglomeration can greatly affect the morphology and therefore quality. While a number of strategies have been attempted to minimize agglomeration, the exact mechanism for this behavior is still a complex interaction of time-temperature history along with molecular and macroscopic mixing. To better understand the effects of turbulence on nanoparticle coagulation a priori analysis of the subgrid particle-particle interactions during nanoparticle formation and growth in shear flows is performed using direct numerical simulation data. The presentation will also highlight some recent work in nanoparticle nucleation and the effects of fluid mixing on particle growth.
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