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Chemo-hydrodynamic pulsations in simple batch A + B → C systems.

Marcello A Budroni1, Alessandro Polo1, Virat Upadhyay2

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|March 23, 2021
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This summary is machine-generated.

Simple chemical reactions can create complex spatio-temporal oscillations. This occurs through an interplay between reaction-diffusion dynamics and chemically driven hydrodynamic flows, leading to self-organized patterns.

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Area of Science:

  • Chemical Kinetics
  • Fluid Dynamics
  • Nonlinear Dynamics

Background:

  • Ubiquitous bimolecular reactions can exhibit complex behavior without nonlinear feedback.
  • Chemically driven hydrodynamic flows can arise from localized variations in surface tension and density.

Purpose of the Study:

  • To elucidate the mechanism of spatio-temporal oscillations induced by chemo-hydrodynamic interactions.
  • To classify dynamical scenarios based on Marangoni and buoyancy-driven convection.
  • To investigate the role of reactor geometry in controlling these oscillations.

Main Methods:

  • Numerical simulations of reaction-diffusion-convection systems.
  • Analysis of parameter space defined by surface tension (ΔM) and buoyancy (ΔR) contributions.
  • Investigation of the influence of reactor height on oscillation dynamics.

Main Results:

  • Sustained or damped spatio-temporal oscillations in concentration and flow fields were observed.
  • Oscillations are primarily hydrodynamic, triggered by localized chemical reactions (Marangoni flows).
  • Marangoni convective roll size dictates oscillation properties, tunable by buoyancy effects.

Conclusions:

  • Chemo-hydrodynamic coupling provides a mechanism for self-organized oscillations in simple reaction systems.
  • Reactor height is a critical parameter for controlling oscillation dynamics.
  • Potential for experimental realization of these chemo-hydrodynamic oscillators for fundamental and applied research.