TITLE:
Nanoparticle Transportation and Brownian Diffusion in Planar Jet Flow via Large Eddy Simulation
AUTHORS:
Peifeng Lin, Dichong Wu, Zefei Zhu
KEYWORDS:
Large Eddy Simulation; Planar Jet Flow; Nanoparticle Evolution; Diffusion
JOURNAL NAME:
Open Journal of Fluid Dynamics,
Vol.2 No.4A,
January
2,
2013
ABSTRACT: The nanoparticle transportation and Brownian diffusion in planar jet flow is simulated via large eddy simulation in this work. To thorough compare the Brownian diffusion with different particle size, we computed three particle diameter dp = 1 nm, 10 nm and 50 nm in one simulation process simultaneously. The numerical results showed that at the flow de- veloping stage, the particle mass concentration pattern develops as the flow vorticity develops. The distribution is nearly uniform at the lower reaches of the nozzle exit. When the jet flow is developing on, vortexes always carry the particle from upstream to downstream, from the central axis region to the outer mixing layer of jet. At the front of the jet flow, particles distribute more homogeneous for they have more residence time to diffuse from higher concentration region to the lower concentration region. The time averaged particle concentration distribution patterns are similar to Gaussian distribution form. The maximum concentration contributed by diffusion is present at the mixing layer near the nozzle exit. The farther away from the nozzle exit in the cross-stream direction, the smaller the concentration is. The maximum concentration contributed by diffusion is several orders smaller than that contributed by flow convection.