Numerical calculations of two-phase flows in agitated vessels using the euler/lagrange approach

摘要

The Euler/Lagrange approach is extended to allow three-dimensional numerical calculations of particle dispersion in a stirred vessel. The fluid flow is calculated on the basis of the Reynolds-averaged Navier-Stokes equations using the k- epsilon tubulence model for closure. In order to resolve both the geometry of the impeller and the vessel with baffles the multiple-reference-frame method is applied. The Lagrangian calculation of the particle phase is performed by considering all relevant forces and those arising in a rotating frame of reference. Additionally, paricle-wall collisions and inter-particle collisions are modeled in detail. It is demonstrated that both two-way coupling and interparticle collisions are of great importance, even at low volume fraction of particles.