Direct numerical simulation of a particle-laden low Reynolds number turbulent round jet

• Published in: International journal of multiphase flow 2011-07, Vol.37 (6), p.539-554
• Main Authors: Li, Debo, Fan, Jianren, Luo, Kun, Cen, Kefa
• Format: Article
• Language: English
• Subjects: Circumferential dispersion; Computational fluid dynamics; Direct numerical simulation; Exact sciences and technology; Fluid dynamics; Fluid flow; Fluids; Fundamental areas of phenomenology (including applications); Jets; Low Reynolds number; Multiphase and particle-laden flows; Nonhomogeneous flows; Particle dispersion; Physics; Round jet; Stokes number; Streamwise vorticity; Turbulence; Turbulent flow; Turbulent flows, convection, and heat transfer; Vortices
• ISSN: 0301-9322; 1879-3533
• DOI: 10.1016/j.ijmultiphaseflow.2011.03.013

Direct numerical simulation method is used for the investigating of particle-laden turbulent flows in a spatially evolution of low Reynolds number axisymmetric jet, and the Eulerian–Lagrangian point-particle approach is employed in the simulation. The simulation uses an explicit coupling scheme between particles and the fluid, which considers two-way coupling between the particle and the fluid. The DNS results are compared well with experimental data with equal Reynolds number ( R e = 1700). Our objects are: (i) to investigate the correlation between the particle number density and the fluctuating of fluid streamwise velocity; (ii) to examine whether the three-dimensional vortex structures in the particle-laden jet are the same as that in the free-air jet and how the particles modulate the thee-dimensional vortex structures and turbulence properties with different Stokes number particles; (iii) to discover the particle circumferential dispersion with different Stokes number particles. Our findings: (i) all the particles, regardless of their particle size, tend to preferentially accumulate in the region with large-than-mean fluid streamwise velocity; (ii) the small Stokes number particles take an important part in the modulation of three-dimensional vortex structures, but for the intermediate and larger sized particles, this modulation effect seems not so apparent; (iii) the particle circumferential dispersion is more effective for the smaller and intermediate sized particles, especially for the intermediate sized particles.