CFD simulation of effects of the configuration of gas distributors on gas-liquid flow and mixing in a bubble column

Research output: Journal PublicationArticlepeer-review

86 Citations (Scopus)

Abstract

Numerical simulations of gas-liquid flow in a cylindrical bubble column of 400 mm in diameter at the superficial gas velocity Ug = 0.10 m s- 1 were conducted to investigate effects of the configuration of gas distributors on hydrodynamic behaviour, gas hold-up and mixing characteristics. Eight different gas distributors were adopted in the simulation. The simulation results clearly show that the configuration of gas distributor have an important impact on liquid velocity and local gas hold-up in the vicinity of the gas distributor. Comparisons of the overall gas holdup and mixing time among different gas distributors have demonstrated that none of the adopted gas distributors was able to produce the highest interfacial area and also yield the shortest mixing time. The CFD modelling results reveal that an increase in the number of gas sparging pipes used in gas distributors is beneficial in improving the gas hold-up but is disadvantageous in reducing bubble size due to a decrease in turbulent kinetic dissipation. It has been demonstrated from the simulations that the appearance of asymmetrical flow patterns in the bubble column and the adoption of smaller gas sparging pipes for gas distributors are effective in improving the mixing characteristics.

Original languageEnglish
Pages (from-to)5104-5116
Number of pages13
JournalChemical Engineering Science
Volume64
Issue number24
DOIs
Publication statusPublished - 2009
Externally publishedYes

Keywords

  • Bubble column
  • Bubble size
  • CFD
  • Gas distributors
  • Mixing

ASJC Scopus subject areas

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

Fingerprint

Dive into the research topics of 'CFD simulation of effects of the configuration of gas distributors on gas-liquid flow and mixing in a bubble column'. Together they form a unique fingerprint.

Cite this