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Inertia Controlled Capillary Pressure at the Juncture between Converging and Uniform Channels

In this research, we reveal the transient behavior of capillary pressure as the fluid-fluid interface travels across the juncture between a converging and uniform capillary, via high-resolution CFD (Computational Fluid Dynamics) simulations. Simulations were performed at different wetting conditions...

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Autores principales: Rabbani, Harris Sajjad, Seers, Thomas Daniel
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6761262/
https://www.ncbi.nlm.nih.gov/pubmed/31554836
http://dx.doi.org/10.1038/s41598-019-49588-x
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author Rabbani, Harris Sajjad
Seers, Thomas Daniel
author_facet Rabbani, Harris Sajjad
Seers, Thomas Daniel
author_sort Rabbani, Harris Sajjad
collection PubMed
description In this research, we reveal the transient behavior of capillary pressure as the fluid-fluid interface travels across the juncture between a converging and uniform capillary, via high-resolution CFD (Computational Fluid Dynamics) simulations. Simulations were performed at different wetting conditions (strong-wet and intermediate-wet) and capillary wall convergence angles. Our results demonstrate that as the angle of convergence increases, capillary pressure at the junction decreases commensurately. Moreover, in contrast to strong-wet conditions, the profile of capillary pressure at the converging-uniform capillary juncture under intermediate-wet conditions is highly non-monotonic, being characterized by a parabola-like form. This non-monotonic behavior is a manifestation of strong inertial forces governing dynamic fluid-fluid interface morphology. This yields conditions that promote the advancement of the fluid-fluid interface, as inertial forces partially nullify the capillary pressure required for the immiscible interface to enter the uniform capillary. In addition to numerical analysis detailed above, a novel theoretical stability criteria that is capable of distinguishing between stable (capillary dominated) and unstable (inertia dominated) interfacial regimes at the converging-uniform capillary juncture is also proposed. In summary, this fundamental study offers new insights into the interface invasion protocol, and paves the way for the re-evaluation of capillary junction controlled interfacial dynamics.
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spelling pubmed-67612622019-10-02 Inertia Controlled Capillary Pressure at the Juncture between Converging and Uniform Channels Rabbani, Harris Sajjad Seers, Thomas Daniel Sci Rep Article In this research, we reveal the transient behavior of capillary pressure as the fluid-fluid interface travels across the juncture between a converging and uniform capillary, via high-resolution CFD (Computational Fluid Dynamics) simulations. Simulations were performed at different wetting conditions (strong-wet and intermediate-wet) and capillary wall convergence angles. Our results demonstrate that as the angle of convergence increases, capillary pressure at the junction decreases commensurately. Moreover, in contrast to strong-wet conditions, the profile of capillary pressure at the converging-uniform capillary juncture under intermediate-wet conditions is highly non-monotonic, being characterized by a parabola-like form. This non-monotonic behavior is a manifestation of strong inertial forces governing dynamic fluid-fluid interface morphology. This yields conditions that promote the advancement of the fluid-fluid interface, as inertial forces partially nullify the capillary pressure required for the immiscible interface to enter the uniform capillary. In addition to numerical analysis detailed above, a novel theoretical stability criteria that is capable of distinguishing between stable (capillary dominated) and unstable (inertia dominated) interfacial regimes at the converging-uniform capillary juncture is also proposed. In summary, this fundamental study offers new insights into the interface invasion protocol, and paves the way for the re-evaluation of capillary junction controlled interfacial dynamics. Nature Publishing Group UK 2019-09-25 /pmc/articles/PMC6761262/ /pubmed/31554836 http://dx.doi.org/10.1038/s41598-019-49588-x Text en © The Author(s) 2019 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
spellingShingle Article
Rabbani, Harris Sajjad
Seers, Thomas Daniel
Inertia Controlled Capillary Pressure at the Juncture between Converging and Uniform Channels
title Inertia Controlled Capillary Pressure at the Juncture between Converging and Uniform Channels
title_full Inertia Controlled Capillary Pressure at the Juncture between Converging and Uniform Channels
title_fullStr Inertia Controlled Capillary Pressure at the Juncture between Converging and Uniform Channels
title_full_unstemmed Inertia Controlled Capillary Pressure at the Juncture between Converging and Uniform Channels
title_short Inertia Controlled Capillary Pressure at the Juncture between Converging and Uniform Channels
title_sort inertia controlled capillary pressure at the juncture between converging and uniform channels
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6761262/
https://www.ncbi.nlm.nih.gov/pubmed/31554836
http://dx.doi.org/10.1038/s41598-019-49588-x
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