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Diffuse interface model to simulate the rise of a fluid droplet across a cloud of particles

Gregory Lecrivain1,2,*, Yuki Kotani1,2, Ryoichi Yamamoto2, Uwe Hampel1,3, and Takashi Taniguchi2,†

  • 1Helmholtz-Zentrum Dresden-Rossendorf, Institut für Fluiddynamik, Bautzner Landstraße 400, 01328 Dresden, Germany
  • 2Kyoto University, Department of Chemical Engineering, Kyoto 615-8510, Japan
  • 3Technische Universität Dresden, AREVA-Stiftungsprofessur für Bildgebende Messverfahren für die Energie- und Verfahrenstechnik, 01062 Dresden, Germany

  • *g.lecrivain@hzdr.de
  • taniguch@cheme.kyoto-u.ac.jp

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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