A REALISTIC COLLISION MODEL BASED ON LUBRICATION IN FLUIDIZED BEDS

摘要

"Lubrication force" arises from hydrodynamic pressure in the interstitial fluid being squeezed out from the space between two solid surfaces. In the present study, the assumptions adopted in classical lubrication theory are examined and semi-theoretical expressions for lubrication force are proposed based on numerical analysis. The paradox of contactless collision due to infinite lubrication force is effectively avoided by considering surface roughness, non-continuum fluid effect and van der Waals force. The calculated restitution coefficient ranged from 0 to nearly 1 and clearly showed that lubrication force plays a significant role.