The Effect of Liquid Bridge Model Details on the Dynamics of Wet Fluidized Beds

We simulate wet fluidized beds of particles in small periodic domains using the CFD-DEM approach. A liquid bridge is formed upon particle-particle collisions, which then ruptures when the particle separation exceeds a critical distance. The simulations take into account both surface tension and viscous forces due to the liquid bridge. We perform a series of simulations based on different liquid bridge formation models: (i) the static bridge model of Shi and McCarthy, (ii) a simple static version of the mode of Wu et al., as well as (iii) the full dynamic bridge model of Wu et al. We systematically compare the differences caused by different liquid bridge formation models, as well as their sensitivity to system parameters. Finally, we provide recommendations for which systems a dynamic liquid bridge model must be used, and for which application this appears to be less important.