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Path instability of a rising bubble.
Guillaume Mougin1, Jacques Magnaudet
1Institut de Mécanique des Fluides de Toulouse, UMR CNRS-INPT-UPS 5502, 2, allée du Professeur Camille Soula, 31400 Toulouse, France.
Physical Review Letters
|January 22, 2002
Summary
This study models rising bubble path instability, revealing that wake instability causing a double threaded wake is the primary cause. Numerical results align with experimental observations of zigzag and spiral bubble paths.
Area of Science:
- Fluid dynamics
- Nonlinear dynamics
- Computational physics
Background:
- Rising bubbles can exhibit complex, unstable paths.
- Understanding bubble trajectory is crucial in various multiphase flow applications.
- Previous models often simplified bubble dynamics or lacked detailed wake analysis.
Purpose of the Study:
- To model and investigate the path instability of a rising bubble.
- To identify the underlying physical mechanisms driving zigzag and spiral bubble trajectories.
- To compare numerical predictions with experimental observations.
Main Methods:
- Numerical simulation of a coupled fluid-body problem.
- Modeling the bubble as a fixed-shape spheroidal body.
- Analysis of the vorticity field in the bubble's wake.
Main Results:
- The model demonstrates path instability for critical control parameter values.
- Simulated zigzag and spiral paths closely match experimental data.
- A double-threaded wake structure was identified as the cause of instability.
Conclusions:
- Wake instability, specifically the double-threaded wake, is the primary driver of rising bubble path instability.
- The fixed-shape spheroidal model provides a valid framework for studying bubble trajectory dynamics.
- Numerical analysis offers valuable insights into complex bubble motion phenomena.