Particle-bubble interaction inside a Hele-Shaw cell.

Area of Science:

• Fluid dynamics
• Multiphase flow
• Microfluidics

Background:

• Hydrodynamic interactions between bubbles and particles are crucial for multiphase separation and reaction processes.
• Understanding these interactions is key to optimizing industrial applications.

Purpose of the Study:

• To investigate the fundamental mechanisms of air bubble-particle collisions.
• To determine the critical conditions governing bubble splitting versus sliding behavior.
• To develop a predictive model for bubble-particle interaction outcomes.

Main Methods:

• Physical experiments were conducted using a single air bubble and a fixed solid particle within a Hele-Shaw cell.
• The initial transverse distance between the bubble and particle centroids was systematically varied.
• A theoretical model was developed based on Darcy's law to estimate bubble volume transfer rates.

Main Results:

• Observed that air bubbles either split into two daughter bubbles or slide around the particle.
• The outcome depends on the initial transverse distance: splitting occurs at small distances, sliding at large distances.
• The developed theoretical model showed good agreement with experimental observations.

Conclusions:

• The study elucidates the distinct behaviors of air bubbles interacting with solid particles.
• A predictive framework was established for bubble splitting versus sliding phenomena.
• Findings contribute to the understanding and design of multiphase flow systems.