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Dual air injection in Hele-Shaw cells creates complex bubble interactions. Optimal phase distribution depends on interaction variability, not just intensity, impacting industrial air sparging and reactors.

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Area of Science:

  • Fluid dynamics
  • Multiphase flow

Background:

  • Vertical Hele-Shaw cells are used to study fluid displacement.
  • Gas-liquid or gas-solid interactions are crucial in industrial processes like air sparging and catalytic reactors.

Purpose of the Study:

  • Investigate the interaction between gas channels formed by simultaneous dual-point air injection.
  • Define and analyze a flow density parameter to characterize bubble interactions and phase distribution.

Main Methods:

  • Utilized a vertical Hele-Shaw cell with simultaneous dual-point air injection.
  • Employed image analysis for granular bed motion tracking to define a flow density parameter.
  • Analyzed vertical (n_{z}) and horizontal (n_{x}) accumulation of the flow density parameter.

Main Results:

  • Dual injection leads to numerous bubbles and intensified air channel interactions compared to single injection.
  • Identified specific vertical heights related to finger-to-fracture transition and average air channel interaction.
  • Horizontal analysis (n_{x}) quantified the overlap of fluidized zones.
  • Optimum three-phase distribution correlates more with interaction variability than intensity.

Conclusions:

  • The variability of air channel interactions, rather than intensity, is key for optimal phase distribution in dual-injection systems.
  • Findings offer insights for optimizing industrial applications involving multiphase flow, such as air sparging and catalytic reactors.