Abstract
Batch sedimentation experiments were conducted with suspensions of noncolloidal spherical particles. Using nuclear magnetic resonance imaging (NMRI), the time evolution of the volume fraction versus height profile was measured for initial suspension volume fractions, φi, ranging from 0.08 to 0.44. NMRI clearly delineates the clear fluid layer at the top of the suspension, below which there is a transition to a region having the initial mean particle concentration. The hindered settling function determined from these data corresponds well with previous results. The spreading of the interface in excess of that expected from the combined effects of polydispersity and self-sharpening was analyzed as a diffusion process. The measured values of the self-induced hydrodynamic diffusivity agreed with those reported previously, and they decreased sharply for φi≳0.15. The concentration profile was also measured through the fan region into the sediment, where the volume fraction is near maximum packing, and determined the fan thickness as a function of time. The fan thickness is found to increase as the initial suspension volume fraction is increased.
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