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=1nm, 10nm and 50nm 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.
Cite this paper
P. Lin, D. Wu and Z. Zhu, "Nanoparticle Transportation and Brownian Diffusion in Planar Jet Flow via Large Eddy Simulation," Open Journal of Fluid Dynamics, Vol. 2 No. 4, 2012, pp. 354-358. doi: 10.4236/ojfd.2012.24A045.
 M. Yu and J. Lin, “Nanoparticle-Laden Flows via Moment Method: A Review,” International Journal of Multiphase Flow, Vol. 36, No. 2, 2010, pp. 144-151.
 W. Daungthongsuk and S. Wongwises, “A Critical Review of Convective Heat Transfer of Nanofluids,” Renewable and Sustainable Energy Reviews, Vol. 11, No. 5, 2007, pp. 797-817. doi:10.1016/j.rser.2005.06.005
 S. Wang and M. V. Johnston, “Airborne Nanoparticle Characterization with a Digital Ion Trap-Reflectron Time of Flight Mass Spectrometer,” International Journal of Mass Spectrometry, Vol. 258, No. 1-3, 2006, pp. 50-57.
 N. Settumba and S. C. Garrick, “Direct Numerical Simulation of Nanoparticle Coagulation in a Temporal Mixing Layer via a Moment Method,” Journal of Aerosol Science, Vol. 34, No. 2, 2003, pp. 149-167.
 J. Lin, P. Lin and H. Chen, “Nanoparticle Distribution in a Rotating Curved Pipe Considering Coagulation and Dispersion,” Science China-Physics Mechanics & Astronomy, Vol. 54, No. 8, 2011, pp. 1502-1513.
 J. Lin, P. Lin, M. Yu and H. Chen, “Nanoparticle Transport and Coagulation in Bends of Circular Cross Section via a New Moment Method,” Chinese Journal of Chemical Engineering, Vol. 18, No. 1, 2010, pp. 1-9.
 Z. Zhang, C. Kleinstreuer, J. F. Donohue and C. S. Kim, “Comparison of Microand Nano-Size Particle Depositions in a Human Upper Airway Model,” Journal of Aerosol Science, Vol. 36, No. 1, 2005, pp. 211-233.
 W. C. Reade and L. R. Collins, “Effects of Preferential Concentration on Turbulent Collision Rates,” Physics of Fluids, Vol. 12, No. 10, 2000, pp. 2530-2540.
 L. Sun, J. Lin and F. Bao, “Numerical Simulation on the Deposition of Nanoparticles under Laminar Conditions,” Journal of Hydrodynamics, Vol. 18, No. 6, 2006, pp. 676680. doi:10.1016/S1001-6058(07)60006-7
 M. Yu, J. Lin, L. Chen and T. Chan, “Large Eddy Simulation of a Planar Jet Flow with Nanoparticle Coagulation,” Acta Mechanica Sinica, Vol. 22, No. 4, 2006, pp. 293-300. doi:10.1007/s10409-006-0011-z
 M. Yu, J. Lin and L. Chen, “Nanoparticle Coagulation in a Planar Jet via Moment Method,” Applied Mathematics and Mechanics, Vol. 28, No. 11, 2007, pp. 1445-1453.
 F. Gelbard, Y. Tambour and J. H. Seinfeld, “Sectional Representations for Simulating Aerosol Dynamics,” Journal of Colloid and Interface Science, Vol. 72, No. 5, 1980, pp. 541-556. doi:10.1016/0021-9797(80)90394-X
 H. Shi, C. Kleinstreuer, Z. Zhang and C. S. Kim, “Nanoparticle Transport and Deposition in Bifurcating Tubes with Different Inlet Conditions,” Physics of Fluids, Vol. 16, No. 7, 2004, pp. 2199-2213. doi:10.1063/1.1724830
 A. Md and R. Og, “Slip Correction Measurements of Spherical Solid Aerosol-Particles in a Improved Millikan Apparatus,” Aerosol Science and Technology, Vol. 4, No. 3, 1985, pp. 269-283. doi:10.1080/02786828508959055