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Diffuse interface model to simulate the rise of a fluid droplet across a cloud of particles
Phys. Rev. Fluids 3, 094002 – Published 25 September, 2018
DOI: https://doi.org/10.1103/PhysRevFluids.3.094002
Abstract
A large variety of industrial and natural systems involve the adsorption of solid particles to the fluidic interface of droplets in motion. A diffuse interface model is here suggested to directly simulate the three-dimensional dynamics of a fluid droplet rising across a cloud of large particles. In this three-phase model the two solid-fluid boundaries and the fluidic boundary are replaced with smoothly spreading interfaces. The capillary effects and the three-phase flow hydrodynamics are fully resolved. A special treatment is adopted for the interparticle collisions. The effect of the particle concentration on the terminal velocity of a rising fluid droplet is then investigated. It is found that, at low Reynolds number, the terminal velocity of a rising fluid droplet decreases exponentially with the particle concentration. This exponential decay is confirmed by a simple rheological model.
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References (40)
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