Numerical Investigation of Particle Transport Hydrodynamics Inside a Water-Iron Sand Jet

Abstract

In order to investigate the mechanism of multi-phase jet technology with dense particles, the device used in cleaning steel strips was elected as the research object. The dynamics of jet flow and energy transfer in two-phase solid–liquid flow is extremely intricate. Constructing mathematical models of such interactions is challenging because of the complexity of particle-toparticle and particle-to-fluid contact. In this paper, an optimized method for considering a dense discrete-phase model is proposed to accurately track the movement of dense particles. Through this approach, the study is carried out in detail from the movement of particles, the corresponding mechanism of the flow field, and the characteristics of the wear. The results indicate that this method can calculate a large number of particles and capture their dynamics accurately. The particles obtain kinetic energy from the high-pressure jet, and most of them move downstream following the main flow. However, part of these solids migrated toward the bilateral region, created by the formation and evolution of the vortex which washes or scrubs the inside of the mixture chamber. These series of movement exhibit time-averaged characteristics in terms of the number of collisions, and the average normal and tangential forces. The curve of average wear rate ranges from a no wear stage, through rapid wear stage, to a rapid and stable stage according to the inner movement of solid-liquid flows.