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Autocatalytic plume pinch-off.

Michael C Rogers¹, Abdelfattah Zebib, Stephen W Morris

¹Department of Physics, University of Toronto, Toronto, Ontario, Canada.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics

|January 15, 2011

Summary

Autocatalytic plumes exhibit complex dynamics, including the formation and detachment of vortical heads. This study reveals that accelerating flow within the plume conduit triggers the pinch-off phenomenon, observed in specific fluid conditions.

Area of Science:

Fluid dynamics
Chemical reactions
Complex systems

Background:

Buoyancy-driven plumes are common in nature and industry.
Autocatalytic reactions, like the iodate-arsenous acid reaction, create unique buoyancy dynamics.
These plumes exhibit complex behaviors due to the interplay of fluid flow and chemical reactions.

Purpose of the Study:

To investigate the pinch-off phenomenon in autocatalytic plumes.
To understand the conditions triggering plume head detachment.
To explore the relationship between fluid dynamics and reaction fronts.

Main Methods:

Experimental investigation using varying glycerol concentrations.
Computational simulations of autocatalytic plume dynamics.

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Analysis of fluid flow and reaction front advection.

Main Results:

Repeated pinch-off of plume heads was observed exclusively within a specific glycerol concentration range.
Simulations identified accelerating flow in the plume conduit as the trigger for pinch-off.
Autocatalytic plumes demonstrate rich dynamics, including multiple generations of detached plume heads.

Conclusions:

The pinch-off of autocatalytic plume heads is directly linked to accelerating conduit flow.
Fluid properties, such as viscosity (varied by glycerol concentration), significantly influence plume behavior and pinch-off frequency.
Understanding these dynamics is crucial for predicting the behavior of reactive buoyant flows.