Gas-kinetic Modeling of Fluid-induced Forces in a Monodisperse Array of Spherical Particles

Multiphase flows of dense particulate phases are ubiquitous in nature and industries. For the accurate prediction of dense gas-solid systems, precise force models covering various flow regimes and particle concentrations are essential. The fluid-induced forces experienced by particles in a dense distribution are very different from that of an isolated particle due to the flow modification in the vicinity of clustered particles. Although several drag modifications for dense particulate distributions are available in the literature, the effect of gas rarefaction and compressibility is not widely understood. In this talk, we investigate the flow phenomenology in a dense monodisperse particle bed at various flow Reynolds numbers and Knudsen numbers using our in-house gas-kinetic Direct Simulation Monte Carlo (DSMC) solver CHAOS. The semi-empirical particle force model developed from the study will be applicable in modeling and understanding high-speed gas-solid flows. Particular emphasis is to incorporate a Knudsen number correction for dense particulate flows in dilute gas regimes.