4.7 Article

Unifying the relative hindered velocity in suspensions and emulsions of nondeformable particles

期刊

GEOPHYSICAL RESEARCH LETTERS
卷 42, 期 1, 页码 53-59

出版社

AMER GEOPHYSICAL UNION
DOI: 10.1002/2014GL062570

关键词

crystal hindered settling; bubble hindered rising; multiparticle system dynamics; suspensions and emulsions; multiphase dynamics; Hindrance effect

资金

  1. NSF [EAR-1144957]

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Although the relative velocity of a single crystal or bubble in a quiescent fluid (melt) is well characterized, the interplay of crystals/bubbles in multiparticle systems and its effect on their settling/rising velocity is poorly quantified. We propose a theoretical model for the hindered velocity of non-Brownian emulsions and suspensions of nondeformable fluid and solid particles in the creeping flow regime. The model is based on three sets of correction: two on the drag coefficient experienced by each particle to account for both return flow and Smoluchowski effects and a correction on the rheology to account for nonlocal interactions introduced as a mean-field effective viscosity. Our model is tested against new and published experimental data over a wide range of particle volume fraction and viscosity ratio between the fluids. We find an excellent agreement between our model and experiments. The model is then applied to show that hindered settling can increase mineral residence time by up to an order of magnitude in convecting magma chambers.

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