Lifting off a solid sphere from a flat bottom by laminar fluid flow

Chao Wang, Hanbin Wang, Kun Zhang, Zhipeng Li* (Corresponding Author), Zhengming Gao (Corresponding Author), Jos J. Derksen

*Corresponding author for this work

Research output: Contribution to journalArticle

Abstract

We perform quantitative visualization experiments on the vertical (z-direction) motion of a spherical solid particle being lifted off a horizontal flat bottom due to laminar fluid flow generated by a revolving impeller. Describing the observed motion of the particle in terms of a constant vertical hydrodynamic force overcoming gravity and the lubrication force has limited success. For this reason we hypothesize that the hydrodynamic force on the particle quickly increases with its distance from the bottom. This hypothesis is supported by detailed numerical simulations of the flow around the particle. Integrating the equation of motion of the sphere with the vertical hydrodynamic force as a linear function of z derived from simulations provides an adequate description of the experimentally observed vertical motion of the particle.
Original languageEnglish
Article numbere16886
Number of pages13
JournalAIChE Journal
Volume66
Issue number4
Early online date29 Dec 2019
DOIs
Publication statusPublished - Apr 2020

Keywords

  • solids suspension
  • quantitative visualization
  • lubrication force
  • particle-resolved simulation
  • agitated flow
  • PARTICLES
  • STIRRED-TANK
  • SLOW MOTION
  • SUSPENSION
  • BOLTZMANN
  • VELOCIMETRY EXPERIMENTS
  • BOUNDARY
  • NUMERICAL SIMULATIONS
  • EQUATION
  • VISCOUS FLUID

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Biotechnology
  • Environmental Engineering

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