Large eddy simulation of the interactions between gas and particles in a turbulent corner-injected flow

Abstract

A numerical and experimental investigation is performed to s the turbulent gas-particle corner-injected flow in a simplified tangentially-fired furnace. The LES coupled with discrete phase model (DPM) is employed for the turbulent gas flow and particle tracking respectively to investigate the influences of turbulence on particle dispersal and that of particle presence on turbulent flow behavior. A new Stokes number definition, st=0.077μ-1ε1/3ρp1/3cp2/3dp4/3, is proposed for this impinging configuration. The Stokes number for small particles (dp = 5 μm) is much less than 1 in whole chamber, hence, they are tightly influenced by the turbulent flow and exhibit a uniform distribution in entire chamber. For the medium particles (dp = 20 μm), the Stokes number is approach to 1 in most areas, so that they present a string-like distribution in the impinging area. The Stokes number for the large particles (dp = 80 μm) is greater than 1, hence, they penetrate the turbulent flow and show strong rigidity when encountering the impingement. The momentum transfer between gas and particles is getting more intensive with the increasing particle size. The above observations reproduce those made from experiments on the same geometry and flow conditions and provide further insight into the coupling of particles and gas in this corner-injected configuration.