Exploring buoyancy-driven effects in chemo-hydrodynamic oscillations sustained by bimolecular reactions

Area of Science:

• Chemical kinetics and fluid dynamics
• Non-linear dynamics and pattern formation

Background:

• Exotic dynamics are typically linked to complex reaction kinetics.
• Simple bimolecular reactions coupled with hydrodynamical flows can exhibit complex dynamics.
• Oscillatory dynamics arise from antagonistic coupling of buoyancy and Marangoni flows.

Purpose of the Study:

• Investigate reactions with cooperative coupling of buoyancy and Marangoni flows.
• Understand how cooperative flows influence spatio-temporal oscillations.
• Identify parameters controlling oscillatory instability.

Main Methods:

• Numerical simulations in 2D reactors.
• Analysis of reactions increasing both density and surface tension.
• Examination of the interplay between buoyancy and Marangoni convection.

Main Results:

• Cooperative coupling of flows leads to dampening of concentration oscillations.
• Buoyancy-driven flow counteracts Marangoni-driven oscillations in this configuration.
• Density and surface tension gradients, along with system height, are identified as key parameters.

Conclusions:

• The coupling mechanism between chemical reactions and fluid dynamics significantly impacts system dynamics.
• Understanding these parameters is crucial for controlling oscillatory instabilities in reactive systems.
• This work extends the understanding of exotic dynamics beyond complex kinetics to simpler systems.