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Dynamic Electroosmotic Flows of Power-Law Fluids in Rectangular Microchannels

Dynamic characteristics of electroosmosis of a typical non-Newtonian liquid in a rectangular microchannel are investigated by using numerical simulations. The non-Newtonian behavior of liquids is assumed to obey the famous power-law model and then the mathematical model is solved numerically by usin...

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Autores principales: Zhao, Cunlu, Zhang, Wenyao, Yang, Chun
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6190456/
http://dx.doi.org/10.3390/mi8020034
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author Zhao, Cunlu
Zhang, Wenyao
Yang, Chun
author_facet Zhao, Cunlu
Zhang, Wenyao
Yang, Chun
author_sort Zhao, Cunlu
collection PubMed
description Dynamic characteristics of electroosmosis of a typical non-Newtonian liquid in a rectangular microchannel are investigated by using numerical simulations. The non-Newtonian behavior of liquids is assumed to obey the famous power-law model and then the mathematical model is solved numerically by using the finite element method. The results indicate that the non-Newtonian effect produces some noticeable dynamic responses in electroosmotic flow. Under a direct current (DC) driving electric field, it is found that the fluid responds more inertly to an external electric field and the steady-state velocity profile becomes more plug-like as the flow behavior index decreases. Under an alternating current (AC) driving electric field, the fluid is observed to experience more significant acceleration and the amplitude of oscillating velocity becomes larger as the fluid behavior index decreases. Furthermore, our investigation also shows that electroosmotic flow of power-law fluids under an AC/DC combined driving field is enhanced as compared with that under a pure DC electric field. These dynamic predictions are of practical use for the design of electroosmotically-driven microfluidic devices that analyze and process non-Newtonian fluids such as biofluids and polymeric solutions.
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spelling pubmed-61904562018-11-01 Dynamic Electroosmotic Flows of Power-Law Fluids in Rectangular Microchannels Zhao, Cunlu Zhang, Wenyao Yang, Chun Micromachines (Basel) Article Dynamic characteristics of electroosmosis of a typical non-Newtonian liquid in a rectangular microchannel are investigated by using numerical simulations. The non-Newtonian behavior of liquids is assumed to obey the famous power-law model and then the mathematical model is solved numerically by using the finite element method. The results indicate that the non-Newtonian effect produces some noticeable dynamic responses in electroosmotic flow. Under a direct current (DC) driving electric field, it is found that the fluid responds more inertly to an external electric field and the steady-state velocity profile becomes more plug-like as the flow behavior index decreases. Under an alternating current (AC) driving electric field, the fluid is observed to experience more significant acceleration and the amplitude of oscillating velocity becomes larger as the fluid behavior index decreases. Furthermore, our investigation also shows that electroosmotic flow of power-law fluids under an AC/DC combined driving field is enhanced as compared with that under a pure DC electric field. These dynamic predictions are of practical use for the design of electroosmotically-driven microfluidic devices that analyze and process non-Newtonian fluids such as biofluids and polymeric solutions. MDPI 2017-01-24 /pmc/articles/PMC6190456/ http://dx.doi.org/10.3390/mi8020034 Text en © 2017 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Zhao, Cunlu
Zhang, Wenyao
Yang, Chun
Dynamic Electroosmotic Flows of Power-Law Fluids in Rectangular Microchannels
title Dynamic Electroosmotic Flows of Power-Law Fluids in Rectangular Microchannels
title_full Dynamic Electroosmotic Flows of Power-Law Fluids in Rectangular Microchannels
title_fullStr Dynamic Electroosmotic Flows of Power-Law Fluids in Rectangular Microchannels
title_full_unstemmed Dynamic Electroosmotic Flows of Power-Law Fluids in Rectangular Microchannels
title_short Dynamic Electroosmotic Flows of Power-Law Fluids in Rectangular Microchannels
title_sort dynamic electroosmotic flows of power-law fluids in rectangular microchannels
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6190456/
http://dx.doi.org/10.3390/mi8020034
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