Numerical and experimental investigation of the flow behavior of sand particles in core shooting process

Abstract

The flow behavior of sand particles during the core shooting process has been studied by combination of computational fluid dynamics (CFD) simulations and experiments. In the CFD simulations, a two-fluid model (TFM), in which a kinetic-frictional constitutive correlation is incorporated, has been applied to describe the flow dynamics of core shooting process. The influences of turbulence model and boundary conditions on the modeling of core shooting process are further investigated. The simulation results indicate that there are certain sensitivities to the wall boundary condition in the sand flow behavior while no significant difference is observed between the results of the laminar and turbulence models. Using high-speed photography system and pressure measuring system, systematic experiments have been carried out to fully validate the model and good agreement is obtained between simulations and experiments. Based on the simulation and experimental results, the flow behavior of sand particles in the core box is analyzed, and the effects of nozzle dimension (D=6, 8, 10, 15mm) and shooting pressure (P in =0.3, 0.4, 0.5MPa) on the hydrodynamic properties such as sand particle mass flux, sand volume fraction at the nozzle and distribution of sand velocity are discussed.

Simulation of Sand Filling Process and Analysis of Flow Behavior with Different Binder Ratio

“…In the present literature, the laminar model and turbulence model predict nearly the same flow behavior of sand particles which is in agreement with the reports that there is no strong turbulent behavior in dense gas-solid flow. 29,33,34 Therefore, a laminar model is applied for sand shooting simulation. The continuity equation for phase q is…”

“…Pelzer et al 28 used TFM to simulate sand shooting process and had a great agreement with sand shooting experiment. Ni et al 29,30 used frictional kinetic model based on TFM to study the influence of grid, frictional stress and drag force on sand shooting process. Makino et al 31 applied DPM for the analysis of sand shooting process and simulation results deviated from experiments.…”