(87c) Assessment of Mesoscale Solid Stress in Coarse Grid TFM Simulation of Geldart a Particles in All Fluidization Regimes
AIChE Annual Meeting
2018 AIChE Annual Meeting
Particle Technology Forum
Fundamentals of Fluidization
Monday, October 29, 2018 - 9:00am to 9:18am
This study focused on assessing the effect of mesoscale solid stress in the coarse grid TFM simulation of gas-solid fluidized beds of Geldart Group A particles over a broad range of flow regimes, including bubbling, turbulent, fast, and pneumatic transport fluidization regimes. Particularly, the impact of mesoscale solid pressure, mesoscale solid viscosity, and mesoscale solid stress anisotropy were investigated by comparing six different coarse grid TFM settings. Compared with the available experimental data, it is found that both the kinetic theory based TFM with only drag correction and the filtered TFM can predict the flow behavior in all fluidization regimes. Mesoscale solid pressure and viscosity have the opposite impact on flow hydrodynamics; they compete and offset each other, which confirms the assumption employed in many previous studies that the mesoscale solid stress could be neglected in coarse grid TFM simulation.