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Liquid transport in a multi-layer froth.

Peter M Ireland¹, Graeme J Jameson

¹Centre for Multiphase Processes, University of Newcastle, NSW 2309, Australia.

Journal of Colloid and Interface Science

|February 20, 2007

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This study models froth layer dynamics in a three-layer system, comparing drift-flux equation predictions with experimental data. A single-parameter drainage model accurately predicted liquid fractions and velocities in wet and dry froth zones.

Area of Science:

Chemical Engineering
Fluid Dynamics
Colloid Science

Background:

Froth layers form when gas is sparged into surfactant solutions.
Injecting water into a froth column creates distinct wet and dry layers.

Purpose of the Study:

To analyze a three-layer froth system using phase coexistence.
To compare drift-flux equation predictions with experimental froth column data.
To evaluate different drainage term representations for predicting liquid behavior.

Main Methods:

Phase coexistence analysis of a three-layer system.
Governing drift-flux equation with one and two adjustable parameter drainage terms.
Experimental measurements in a laboratory froth column.

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Main Results:

Both drainage term models showed good agreement with experimental liquid fractions and superficial liquid velocities.
The single-parameter drainage term, derived from the Richardson-Zaki equation, was marginally superior.
Theoretical predictions for the dry froth layer's liquid fraction and overflow rate were supported by data.

Conclusions:

The drift-flux model effectively predicts froth layer behavior.
The single-parameter drainage term offers a robust and accurate approach.
Density-driven convective motions influence the wet froth layer dynamics.