Bubble formation from an orifice in liquid cross-flow

H. Mirsandi, W. J. Smit, G. Kong, M. W. Baltussen (Corresponding author), E. A.J.F. Peters, J. A.M. Kuipers

Research output: Contribution to journalArticleAcademicpeer-review

3 Citations (Scopus)

Abstract

The formation of gas bubbles by submerged orifices in a cross-flowing liquid is encountered in many industrial applications. It is therefore important to understand the dynamics of bubble formation and to accurately predict the bubble detachment characteristics under such situations. In the present work, the process is numerically studied using the Local Front Reconstruction Method (LFRM), a Front Tracking Direct Numerical Simulation method that enables the simulation of interface merging and breakup. Experiments of bubble formation subjected to cross-flow induced shear are also performed to provide data for the validation of the numerical simulations. The predictions of the bubble shape and the detached bubble volume obtained by the numerical model show good agreement with the experimental results. The validated numerical model is then used to study the effects of volumetric gas flow rate and fluid physical properties on the bubble detachment characteristics under various shear rates in the quasi-static bubble growth regime. The simulation results show that the shear flow advances the bubble detachment and decreases the bubble size. Consequently, the bubble formation frequency and the detached bubble size can be controlled by exerting different shear rates. At higher shear rates, the simulated bubbles are highly deformed due to the drag force created by the tangential liquid flow and the influence of liquid properties on the bubble detachment characteristics becomes less significant.

Original languageEnglish
JournalChemical Engineering Journal
DOIs
Publication statusE-pub ahead of print - 1 Feb 2019

Fingerprint

Bubble formation
Orifices
Bubbles (in fluids)
bubble
liquid
Shear deformation
Liquids
Numerical models
Direct numerical simulation
Shear flow
Merging
Industrial applications
Flow of gases
Drag
Physical properties
Gases
Flow rate
simulation
Fluids
Computer simulation

Keywords

  • Bubble formation
  • Front-tracking
  • Liquid cross-flow
  • Local Front Reconstruction Method
  • Numerical simulation
  • Orifice

Cite this

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title = "Bubble formation from an orifice in liquid cross-flow",
abstract = "The formation of gas bubbles by submerged orifices in a cross-flowing liquid is encountered in many industrial applications. It is therefore important to understand the dynamics of bubble formation and to accurately predict the bubble detachment characteristics under such situations. In the present work, the process is numerically studied using the Local Front Reconstruction Method (LFRM), a Front Tracking Direct Numerical Simulation method that enables the simulation of interface merging and breakup. Experiments of bubble formation subjected to cross-flow induced shear are also performed to provide data for the validation of the numerical simulations. The predictions of the bubble shape and the detached bubble volume obtained by the numerical model show good agreement with the experimental results. The validated numerical model is then used to study the effects of volumetric gas flow rate and fluid physical properties on the bubble detachment characteristics under various shear rates in the quasi-static bubble growth regime. The simulation results show that the shear flow advances the bubble detachment and decreases the bubble size. Consequently, the bubble formation frequency and the detached bubble size can be controlled by exerting different shear rates. At higher shear rates, the simulated bubbles are highly deformed due to the drag force created by the tangential liquid flow and the influence of liquid properties on the bubble detachment characteristics becomes less significant.",
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Bubble formation from an orifice in liquid cross-flow. / Mirsandi, H.; Smit, W. J.; Kong, G.; Baltussen, M. W. (Corresponding author); Peters, E. A.J.F.; Kuipers, J. A.M.

In: Chemical Engineering Journal, 01.02.2019.

Research output: Contribution to journalArticleAcademicpeer-review

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