Interaction between gas channels in water-saturated sands

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.