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Rheology of particulate suspensions with non-Newtonian fluids in capillaries

Particulate suspensions occur in situations from blood flow to slurries in drilling applications. Existing investigations of these suspensions generally concentrate on the impact of particle volume fraction for suspensions in Newtonian fluids under free-flow conditions. Recently, particulate-polymer...

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Detalles Bibliográficos
Autores principales: Xia, Bin, Krueger, Paul S.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: The Royal Society 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9199073/
https://www.ncbi.nlm.nih.gov/pubmed/35756882
http://dx.doi.org/10.1098/rspa.2021.0615
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author Xia, Bin
Krueger, Paul S.
author_facet Xia, Bin
Krueger, Paul S.
author_sort Xia, Bin
collection PubMed
description Particulate suspensions occur in situations from blood flow to slurries in drilling applications. Existing investigations of these suspensions generally concentrate on the impact of particle volume fraction for suspensions in Newtonian fluids under free-flow conditions. Recently, particulate-polymer composites have been used in additive manufacturing (AM). Here, the polymer becomes a shear-thinning non-Newtonian fluid during extrusion, creating a particulate suspension. Motivated by the challenges in AM of particulate composites, this study investigates the rheology of suspensions of micrometre-sized particles in shear-thinning silicone while extruded through AM-scaled nozzles (millimetre-scale diameters). The suspensions were observed to follow a power-law behaviour and their rheology was investigated through the measured flow consistency ([Formula: see text]) and behaviour ([Formula: see text]) indices. The impact of the particle volume fraction ([Formula: see text]) and the ratio ([Formula: see text]) of the capillary inside diameter to the particle diameter on both indices were measured. [Formula: see text] was found to be only impacted by the suspension fluid type and [Formula: see text]. [Formula: see text] was found to be constant at large [Formula: see text] , but decreased and then increased to infinity with [Formula: see text] decreasing. Based on its behaviour, [Formula: see text] was categorized into two conditions and analysed separately with semi-empirical models. The impact of particle size distribution was also investigated.
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spelling pubmed-91990732022-06-23 Rheology of particulate suspensions with non-Newtonian fluids in capillaries Xia, Bin Krueger, Paul S. Proc Math Phys Eng Sci Research Articles Particulate suspensions occur in situations from blood flow to slurries in drilling applications. Existing investigations of these suspensions generally concentrate on the impact of particle volume fraction for suspensions in Newtonian fluids under free-flow conditions. Recently, particulate-polymer composites have been used in additive manufacturing (AM). Here, the polymer becomes a shear-thinning non-Newtonian fluid during extrusion, creating a particulate suspension. Motivated by the challenges in AM of particulate composites, this study investigates the rheology of suspensions of micrometre-sized particles in shear-thinning silicone while extruded through AM-scaled nozzles (millimetre-scale diameters). The suspensions were observed to follow a power-law behaviour and their rheology was investigated through the measured flow consistency ([Formula: see text]) and behaviour ([Formula: see text]) indices. The impact of the particle volume fraction ([Formula: see text]) and the ratio ([Formula: see text]) of the capillary inside diameter to the particle diameter on both indices were measured. [Formula: see text] was found to be only impacted by the suspension fluid type and [Formula: see text]. [Formula: see text] was found to be constant at large [Formula: see text] , but decreased and then increased to infinity with [Formula: see text] decreasing. Based on its behaviour, [Formula: see text] was categorized into two conditions and analysed separately with semi-empirical models. The impact of particle size distribution was also investigated. The Royal Society 2022-06 2022-06-15 /pmc/articles/PMC9199073/ /pubmed/35756882 http://dx.doi.org/10.1098/rspa.2021.0615 Text en © 2022 The Authors. https://creativecommons.org/licenses/by/4.0/Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, provided the original author and source are credited.
spellingShingle Research Articles
Xia, Bin
Krueger, Paul S.
Rheology of particulate suspensions with non-Newtonian fluids in capillaries
title Rheology of particulate suspensions with non-Newtonian fluids in capillaries
title_full Rheology of particulate suspensions with non-Newtonian fluids in capillaries
title_fullStr Rheology of particulate suspensions with non-Newtonian fluids in capillaries
title_full_unstemmed Rheology of particulate suspensions with non-Newtonian fluids in capillaries
title_short Rheology of particulate suspensions with non-Newtonian fluids in capillaries
title_sort rheology of particulate suspensions with non-newtonian fluids in capillaries
topic Research Articles
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9199073/
https://www.ncbi.nlm.nih.gov/pubmed/35756882
http://dx.doi.org/10.1098/rspa.2021.0615
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