Lift force in bubbly suspensions

Krishnan Sankaranarayanan, Sankaran Sundaresan

Research output: Contribution to journalArticle

68 Scopus citations

Abstract

Closure relations are presented for the lift coefficient for ordered arrays of 2-D and 3-D bubbles at various bubble volume fractions. These were determined via lattice Boltzmann simulations of bubble rise in periodic boxes, where the bubbles were also subjected to shear. The single-bubble lift coefficient, determined by low-shear computational experiments, varies in a systematic manner with the aspect ratio of the bubbles. At high shear rates the lift coefficient manifested a noticeable shear rate-dependence and it could even become negative. Through a linear stability analysis of the uniformly bubbling state, it is demonstrated that the lift force can destabilize a uniformly rising array of highly distorted bubbles and give way to columnar structures.

Original languageEnglish (US)
Pages (from-to)3521-3542
Number of pages22
JournalChemical Engineering Science
Volume57
Issue number17
DOIs
StatePublished - Sep 13 2002

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

Keywords

  • Bubble columns
  • Drag
  • Dynamic simulation
  • Hydrodynamics
  • Lift force
  • Multiphase flow
  • Stability
  • Suspension
  • Virtual mass

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