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Effect of Shear on Pumped Capillary Foams

[Image: see text] Foam flow in many applications, like firefighting and oil recovery, requires stable foams that can withstand the stress and aging that result from both shear and thermodynamic instability. Events of drainage and coarsening drive the collapse of foams and greatly affect foam efficac...

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Autores principales: Okesanjo, Omotola, Meredith, J. Carson, Behrens, Sven Holger
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Chemical Society 2023
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10178927/
https://www.ncbi.nlm.nih.gov/pubmed/37191909
http://dx.doi.org/10.1021/acs.iecr.3c00456
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author Okesanjo, Omotola
Meredith, J. Carson
Behrens, Sven Holger
author_facet Okesanjo, Omotola
Meredith, J. Carson
Behrens, Sven Holger
author_sort Okesanjo, Omotola
collection PubMed
description [Image: see text] Foam flow in many applications, like firefighting and oil recovery, requires stable foams that can withstand the stress and aging that result from both shear and thermodynamic instability. Events of drainage and coarsening drive the collapse of foams and greatly affect foam efficacy in processes relying on foam transport. Recently, it was discovered that foams can be stabilized by the synergistic action of colloidal particles and a small amount of a water-immiscible liquid that mediates capillary forces. The so-called capillary foams contain gas bubbles that are coated by a thin oil-particle film and integrated in a network of oil-bridged particles; the present study explores how this unique architecture impacts the foams’ flow dynamics. We pumped capillary foams through millimeter-sized tubing (ID: 790 μm) at different flow rates and analyzed the influence of stress and aging on capillary foam stability. We find that the foams remain stable when pumped at higher flow rates but undergo phase separation when pumped at low flow rates. Our observations further show that the particle network is responsible for the observed stability in capillary foams and that network strength and stability of an existing foam can be increased by shearing.
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spelling pubmed-101789272023-05-13 Effect of Shear on Pumped Capillary Foams Okesanjo, Omotola Meredith, J. Carson Behrens, Sven Holger Ind Eng Chem Res [Image: see text] Foam flow in many applications, like firefighting and oil recovery, requires stable foams that can withstand the stress and aging that result from both shear and thermodynamic instability. Events of drainage and coarsening drive the collapse of foams and greatly affect foam efficacy in processes relying on foam transport. Recently, it was discovered that foams can be stabilized by the synergistic action of colloidal particles and a small amount of a water-immiscible liquid that mediates capillary forces. The so-called capillary foams contain gas bubbles that are coated by a thin oil-particle film and integrated in a network of oil-bridged particles; the present study explores how this unique architecture impacts the foams’ flow dynamics. We pumped capillary foams through millimeter-sized tubing (ID: 790 μm) at different flow rates and analyzed the influence of stress and aging on capillary foam stability. We find that the foams remain stable when pumped at higher flow rates but undergo phase separation when pumped at low flow rates. Our observations further show that the particle network is responsible for the observed stability in capillary foams and that network strength and stability of an existing foam can be increased by shearing. American Chemical Society 2023-05-01 /pmc/articles/PMC10178927/ /pubmed/37191909 http://dx.doi.org/10.1021/acs.iecr.3c00456 Text en © 2023 The Authors. Published by American Chemical Society https://creativecommons.org/licenses/by/4.0/Permits the broadest form of re-use including for commercial purposes, provided that author attribution and integrity are maintained (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Okesanjo, Omotola
Meredith, J. Carson
Behrens, Sven Holger
Effect of Shear on Pumped Capillary Foams
title Effect of Shear on Pumped Capillary Foams
title_full Effect of Shear on Pumped Capillary Foams
title_fullStr Effect of Shear on Pumped Capillary Foams
title_full_unstemmed Effect of Shear on Pumped Capillary Foams
title_short Effect of Shear on Pumped Capillary Foams
title_sort effect of shear on pumped capillary foams
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10178927/
https://www.ncbi.nlm.nih.gov/pubmed/37191909
http://dx.doi.org/10.1021/acs.iecr.3c00456
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