Abstract
Large eddy simulations (LES) of titanium dioxide nanoparticles in three dimensional turbulent reacting planar jets are performed. The spatio-temporal evolution of the particle field is obtained by utilizing a nodal representation of the general dynamic equation. Gradient-diffusion, Smagorinsky-type subgrid-scale closures are employed to account for the unresolved stresses, fluid-scalar fluxes, and fluid-particle fluxes. The effect of the unresolved fluctuations on coagulation are neglected. Simulations are performed at two different precursor concentration levels. Comparison between results obtained via direct numerical simulation (DNS) and LES is performed to assess the performance of the closures. The LES performs fairly well in predicting the particle concentration as a function of size as well as the mean diameter. Additionally the polydispersity of the LES particle field is greater than that of the DNS. The results also suggest that at as the precursor concentration increases, neglect of the unresolved particle-particle interactions may act to increase the nanoparticle growth-rate.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 616-628 |
| Number of pages | 13 |
| Journal | Aerosol Science and Technology |
| Volume | 45 |
| Issue number | 5 |
| DOIs | |
| State | Published - May 2011 |
Bibliographical note
Funding Information:Funding for this work was provided by the University of Minnesota. Support for J. Loeffler was provided by the University of Minnesota’s Undergraduate Research Opportunity Program. All computations were performed at the Minnesota Super-computing Institute.