Modeling the motion of a Taylor bubble in a microchannel through a shear-thinning fluid

Applications of multiphase flows in microchannels as chemical and biological reactors and cooling systems for microelectronic devices typically present liquid slugs alternated with bubbles of elongated shape, the Taylor bubbles. These occupy almost entirely the cross-section of the channel and prese...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	Aquino Andrea, Picchi Davide, Poesio Pietro
Formato:	article
Lenguaje:	EN FR
Publicado:	EDP Sciences 2021
Materias:	Environmental sciences GE1-350
Acceso en línea:	https://doaj.org/article/cd879600cb1944e6ad2661015875d162
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

id	oai:doaj.org-article:cd879600cb1944e6ad2661015875d162
record_format	dspace
spelling	oai:doaj.org-article:cd879600cb1944e6ad2661015875d1622021-11-08T15:18:51ZModeling the motion of a Taylor bubble in a microchannel through a shear-thinning fluid2267-124210.1051/e3sconf/202131205006https://doaj.org/article/cd879600cb1944e6ad2661015875d1622021-01-01T00:00:00Zhttps://www.e3s-conferences.org/articles/e3sconf/pdf/2021/88/e3sconf_ati2021_05006.pdfhttps://doaj.org/toc/2267-1242Applications of multiphase flows in microchannels as chemical and biological reactors and cooling systems for microelectronic devices typically present liquid slugs alternated with bubbles of elongated shape, the Taylor bubbles. These occupy almost entirely the cross-section of the channel and present a hemispherical front and a liquid layer, the lubrication film, which separates the gas from the tube wall. The Taylor bubble perturbs the surrounding fluids activating many transport mechanisms in the proximity of the gas-liquid interface; therefore, the bubble motion significantly influences the heat and mass transfer rates. Although many works deeply investigate the bubble hydrodynamics in Newtonian fluids, the knowledge about the relation between bubble hydrodynamics and rheological properties is insufficient, and studies where the continuous phase exhibits a shear-thinning behavior are missing. Our numerical analysis tries to fill this gap by investigating the motion of a Taylor bubble in a non-Newtonian shear-thinning fluid, modeled by the Carreau viscosity model. First, we validate the results against the Newtonian case and a recent theory for shear-thinning fluids (Picchi et al., Journal of Fluid Mechanics, 2021, 918). Then, we investigate the bubble hydrodynamics far from the validity range of the current models. Finally, we study the scaling of the bubble velocity and lubrication film thickness, extending the current theory to shear-thinning fluids.Aquino AndreaPicchi DavidePoesio PietroEDP SciencesarticleEnvironmental sciencesGE1-350ENFRE3S Web of Conferences, Vol 312, p 05006 (2021)
institution	DOAJ
collection	DOAJ
language	EN FR
topic	Environmental sciences GE1-350
spellingShingle	Environmental sciences GE1-350 Aquino Andrea Picchi Davide Poesio Pietro Modeling the motion of a Taylor bubble in a microchannel through a shear-thinning fluid
description	Applications of multiphase flows in microchannels as chemical and biological reactors and cooling systems for microelectronic devices typically present liquid slugs alternated with bubbles of elongated shape, the Taylor bubbles. These occupy almost entirely the cross-section of the channel and present a hemispherical front and a liquid layer, the lubrication film, which separates the gas from the tube wall. The Taylor bubble perturbs the surrounding fluids activating many transport mechanisms in the proximity of the gas-liquid interface; therefore, the bubble motion significantly influences the heat and mass transfer rates. Although many works deeply investigate the bubble hydrodynamics in Newtonian fluids, the knowledge about the relation between bubble hydrodynamics and rheological properties is insufficient, and studies where the continuous phase exhibits a shear-thinning behavior are missing. Our numerical analysis tries to fill this gap by investigating the motion of a Taylor bubble in a non-Newtonian shear-thinning fluid, modeled by the Carreau viscosity model. First, we validate the results against the Newtonian case and a recent theory for shear-thinning fluids (Picchi et al., Journal of Fluid Mechanics, 2021, 918). Then, we investigate the bubble hydrodynamics far from the validity range of the current models. Finally, we study the scaling of the bubble velocity and lubrication film thickness, extending the current theory to shear-thinning fluids.
format	article
author	Aquino Andrea Picchi Davide Poesio Pietro
author_facet	Aquino Andrea Picchi Davide Poesio Pietro
author_sort	Aquino Andrea
title	Modeling the motion of a Taylor bubble in a microchannel through a shear-thinning fluid
title_short	Modeling the motion of a Taylor bubble in a microchannel through a shear-thinning fluid
title_full	Modeling the motion of a Taylor bubble in a microchannel through a shear-thinning fluid
title_fullStr	Modeling the motion of a Taylor bubble in a microchannel through a shear-thinning fluid
title_full_unstemmed	Modeling the motion of a Taylor bubble in a microchannel through a shear-thinning fluid
title_sort	modeling the motion of a taylor bubble in a microchannel through a shear-thinning fluid
publisher	EDP Sciences
publishDate	2021
url	https://doaj.org/article/cd879600cb1944e6ad2661015875d162
work_keys_str_mv	AT aquinoandrea modelingthemotionofataylorbubbleinamicrochannelthroughashearthinningfluid AT picchidavide modelingthemotionofataylorbubbleinamicrochannelthroughashearthinningfluid AT poesiopietro modelingthemotionofataylorbubbleinamicrochannelthroughashearthinningfluid
_version_	1718441993894363136

Modeling the motion of a Taylor bubble in a microchannel through a shear-thinning fluid

Ejemplares similares