Four-way coupled second-order method of two-fluid model for gas-particle flow and the numerical simulation in horizontal channels

Abstract

Abstract In this study, a four-way coupled second-order method of Eulerian-Eulerian two-fluid model is proposed to numerically investigate the gas-particle flow, where exist particle-particle collisions, however, the particle turbulence is far from equilibrium to satisfy the Boussinesq approximation. The second-order two-fluid model is developed by coupling the gas phase model of Reynolds-averaged Navier-Stokes method closed by the second-order Reynolds stress turbulence model with the particle simulation equations of second-order moment method of kinetic theory of granular flow. The four-way coupling method is established considering the particle-particle collisions and fluid-particle interactions, which are represented by the momentum exchange between two phases, fluid turbulence generation and/or dissipation due to the presence of particles, and the particle fluctuation due to drag fluctuations. Furthermore, the model is applied to the pneumatic conveying in a horizontal channel to demonstrate the Eulerian-Eulerian two-fluid modeling of the gas-particle flow in the median concentration of the particles. The model is found superior to the two-way coupled method and the classic isotropic method of kinetic theory of granular flow. The simulation results are in good agreement with the experimental results.