Numerical and Experimental Study of the Squeezing-to-Dripping Transition in a T-Junction

In this work, we study the transition from squeezing to dripping during the formation of bubbles in a capillary T-junction in conditions relevant to microgravity. The junction is formed by two perpendicular cylinders of equal section (1 mm of internal diameter). The capillary number Ca (based on the...

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Autores: Arias Calderón, Santiago|||0000-0001-9233-0178, Villardi de Montlaur, Adeline de|||0000-0002-0243-668X
Tipo de recurso: artículo
Fecha de publicación:2020
País:España
Institución:Universitat Politècnica de Catalunya (UPC)
Repositorio:UPCommons. Portal del coneixement obert de la UPC
Idioma:inglés
OAI Identifier:oai:upcommons.upc.edu:2117/192419
Acceso en línea:https://hdl.handle.net/2117/192419
https://dx.doi.org/10.1007/s12217-020-09794-z
Access Level:acceso abierto
Palabra clave:Computational fluid dynamics
Reduced gravity environments
Microbubbles
Bubbles
Microgravity
Two-phase flow
Bubble generation
T-junction
Computational Fluid Dynamics (CFD)
Squeezing-to-dripping transition
Dinàmica de fluids computacional
Bombolles
Ambients de microgravetat
Àrees temàtiques de la UPC::Física
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oai_identifier_str oai:upcommons.upc.edu:2117/192419
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repository_id_str
spelling Numerical and Experimental Study of the Squeezing-to-Dripping Transition in a T-JunctionArias Calderón, Santiago|||0000-0001-9233-0178Villardi de Montlaur, Adeline de|||0000-0002-0243-668XComputational fluid dynamicsReduced gravity environmentsMicrobubblesBubblesMicrogravityTwo-phase flowBubble generationT-junctionComputational Fluid Dynamics (CFD)Squeezing-to-dripping transitionDinàmica de fluids computacionalBombollesAmbients de microgravetatÀrees temàtiques de la UPC::FísicaIn this work, we study the transition from squeezing to dripping during the formation of bubbles in a capillary T-junction in conditions relevant to microgravity. The junction is formed by two perpendicular cylinders of equal section (1 mm of internal diameter). The capillary number Ca (based on the continuous phase) is used as the key parameter of the study. For the range of Ca covered in this paper, the same two common bubble formation mechanisms as the ones described in the related literature have been observed: squeezing regime at low Ca and dripping regime for higher Ca. This paper provides a new value of the critical Ca for the transition from squeezing to dripping. This value has been obtained with two independent approaches, experimentally and numerically. Experimental photographs have been used to determine the value of Ca at which a gap appears between the forming bubble and the capillary’s wall, as an evidence of the activation of the shearing mechanism related to the dripping regime. Additionally, the dependence of the bubble volume on the capillary number and the gas/liquid flow rate ratio has been analysed. In this work, we also propose a new numerical approach, complementary to the experimental one, carried out with the Computational Fluid Dynamics solver ANSYS Fluent v15.0.7. Numerical simulations have been performed to study the geometry and the behaviour of the gas-liquid interface during the cycle of bubble formation. Upstream the T-junction, as the fluctuation in pressure decreases, the vertical movement of the rear meniscus (gas-liquid interface in contact with the solid vertical capillary) also decreases, and the shear stresses begins to play an active role until overcoming the squeezing mechanism. Numerical simulations presented in this paper support the experimental observations, confirming that Computational Fluid Dynamics studies can be a useful tool to improve the experimental knowledge.Peer Reviewed20202020-05-2620202020-07-04journal articlehttp://purl.org/coar/resource_type/c_6501AMhttp://purl.org/coar/version/c_ab4af688f83e57aainfo:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/2117/192419https://dx.doi.org/10.1007/s12217-020-09794-zreponame:UPCommons. Portal del coneixement obert de la UPCinstname:Universitat Politècnica de Catalunya (UPC)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2Attribution-NonCommercial-NoDerivs 3.0 Spainhttp://creativecommons.org/licenses/by-nc-nd/3.0/es/info:eu-repo/semantics/openAccessoai:upcommons.upc.edu:2117/1924192026-05-27T15:37:01Z
dc.title.none.fl_str_mv Numerical and Experimental Study of the Squeezing-to-Dripping Transition in a T-Junction
title Numerical and Experimental Study of the Squeezing-to-Dripping Transition in a T-Junction
spellingShingle Numerical and Experimental Study of the Squeezing-to-Dripping Transition in a T-Junction
Arias Calderón, Santiago|||0000-0001-9233-0178
Computational fluid dynamics
Reduced gravity environments
Microbubbles
Bubbles
Microgravity
Two-phase flow
Bubble generation
T-junction
Computational Fluid Dynamics (CFD)
Squeezing-to-dripping transition
Dinàmica de fluids computacional
Bombolles
Ambients de microgravetat
Àrees temàtiques de la UPC::Física
title_short Numerical and Experimental Study of the Squeezing-to-Dripping Transition in a T-Junction
title_full Numerical and Experimental Study of the Squeezing-to-Dripping Transition in a T-Junction
title_fullStr Numerical and Experimental Study of the Squeezing-to-Dripping Transition in a T-Junction
title_full_unstemmed Numerical and Experimental Study of the Squeezing-to-Dripping Transition in a T-Junction
title_sort Numerical and Experimental Study of the Squeezing-to-Dripping Transition in a T-Junction
dc.creator.none.fl_str_mv Arias Calderón, Santiago|||0000-0001-9233-0178
Villardi de Montlaur, Adeline de|||0000-0002-0243-668X
author Arias Calderón, Santiago|||0000-0001-9233-0178
author_facet Arias Calderón, Santiago|||0000-0001-9233-0178
Villardi de Montlaur, Adeline de|||0000-0002-0243-668X
author_role author
author2 Villardi de Montlaur, Adeline de|||0000-0002-0243-668X
author2_role author
dc.subject.none.fl_str_mv Computational fluid dynamics
Reduced gravity environments
Microbubbles
Bubbles
Microgravity
Two-phase flow
Bubble generation
T-junction
Computational Fluid Dynamics (CFD)
Squeezing-to-dripping transition
Dinàmica de fluids computacional
Bombolles
Ambients de microgravetat
Àrees temàtiques de la UPC::Física
topic Computational fluid dynamics
Reduced gravity environments
Microbubbles
Bubbles
Microgravity
Two-phase flow
Bubble generation
T-junction
Computational Fluid Dynamics (CFD)
Squeezing-to-dripping transition
Dinàmica de fluids computacional
Bombolles
Ambients de microgravetat
Àrees temàtiques de la UPC::Física
description In this work, we study the transition from squeezing to dripping during the formation of bubbles in a capillary T-junction in conditions relevant to microgravity. The junction is formed by two perpendicular cylinders of equal section (1 mm of internal diameter). The capillary number Ca (based on the continuous phase) is used as the key parameter of the study. For the range of Ca covered in this paper, the same two common bubble formation mechanisms as the ones described in the related literature have been observed: squeezing regime at low Ca and dripping regime for higher Ca. This paper provides a new value of the critical Ca for the transition from squeezing to dripping. This value has been obtained with two independent approaches, experimentally and numerically. Experimental photographs have been used to determine the value of Ca at which a gap appears between the forming bubble and the capillary’s wall, as an evidence of the activation of the shearing mechanism related to the dripping regime. Additionally, the dependence of the bubble volume on the capillary number and the gas/liquid flow rate ratio has been analysed. In this work, we also propose a new numerical approach, complementary to the experimental one, carried out with the Computational Fluid Dynamics solver ANSYS Fluent v15.0.7. Numerical simulations have been performed to study the geometry and the behaviour of the gas-liquid interface during the cycle of bubble formation. Upstream the T-junction, as the fluctuation in pressure decreases, the vertical movement of the rear meniscus (gas-liquid interface in contact with the solid vertical capillary) also decreases, and the shear stresses begins to play an active role until overcoming the squeezing mechanism. Numerical simulations presented in this paper support the experimental observations, confirming that Computational Fluid Dynamics studies can be a useful tool to improve the experimental knowledge.
publishDate 2020
dc.date.none.fl_str_mv 2020
2020-05-26
2020
2020-07-04
dc.type.none.fl_str_mv journal article
http://purl.org/coar/resource_type/c_6501
AM
http://purl.org/coar/version/c_ab4af688f83e57aa
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://hdl.handle.net/2117/192419
https://dx.doi.org/10.1007/s12217-020-09794-z
url https://hdl.handle.net/2117/192419
https://dx.doi.org/10.1007/s12217-020-09794-z
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
Attribution-NonCommercial-NoDerivs 3.0 Spain
http://creativecommons.org/licenses/by-nc-nd/3.0/es/
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
Attribution-NonCommercial-NoDerivs 3.0 Spain
http://creativecommons.org/licenses/by-nc-nd/3.0/es/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.source.none.fl_str_mv reponame:UPCommons. Portal del coneixement obert de la UPC
instname:Universitat Politècnica de Catalunya (UPC)
instname_str Universitat Politècnica de Catalunya (UPC)
reponame_str UPCommons. Portal del coneixement obert de la UPC
collection UPCommons. Portal del coneixement obert de la UPC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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