2018/12/17 by Man, Teng, Feng, Qingfeng, Hill, K. M.
#FOS: Physical sciences #Fluid Dynamics (physics.flu-dyn) #Soft Condensed Matter (cond-mat.soft)
paper · doi:10.48550/arxiv.1812.07083
We investigate the link between particle-scale dynamics and bulk behaviors of thickly-coated particle-fluid flows using computational simulations. We find that, similar to dense fully-saturated slurries, the form the rheology takes in these systems can carry signatures of interparticle collisions and/or interparticle viscous dynamics that vary solid fraction. However, we find significant qualitative and quantitative differences in the transitions of the system between what might be called viscous, collisional, and visco-collisional behaviors. We show how these transitions arise from changes in the `fabric,' e.g. strong force network, and the `granular temperature,' or fluctuation energy, and suggest extension of these frameworks to better elucidate other particle-fluid behaviors.