79 Numerical Simulation of Turbulent Dispersion and Atomization within Sprays Available to Purchase

We present a finite volume CFD methodology for modeling liquid dispersion and atomization within sprays. The proposed CFD model is based on the Eulerian multi-fluid approach, i.e., the mass and momentum conservation equations are solved for both phases. The population balance equation is solved along with the Navier-Stokes equations for tracking droplet diameters. To introduce the physics of spray atomization processes into the population balance equation, a new mathematical model is developed for calculating droplet break up frequency and included in the population balance equation as a source term. This new model calculates the droplet break up frequency based on both drag and turbulence induced fragmentation stresses. Finally, preliminary results using this CFD model are presented for the case of a coaxial airblast atomizer and a good agreement with the experimental data is achieved.