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Conference Paper: Electroosmotic Flow of Viscoplastic Fluids Through a Slit Microchannel

TitleElectroosmotic Flow of Viscoplastic Fluids Through a Slit Microchannel
Authors
Issue Date2013
PublisherHong Kong Society of Theoretical and Applied Mechanics (HKSTAM).
Citation
Proceedings of the 17th Annual Conference of Hong Kong Society of Theoretical and Applied Mechanics (HKSTAM 2013) , the 9th Jiangsu-Hong Kong Forum on Mechanics and Its Application (JSTAM), and the 3rd Symposium on the Development of Mechanics, Hong Kong-Macau, China, 22-23 March 2013, p. 15 How to Cite?
AbstractAbstract: In absence of external applied pressure, the hydrodynamically fully-developed electroosmotic flow (EOF) of non-Newtonian fluids in a slit microchannel is analytically studied. The Casson, Bingham and Herschel-Bulkley models are adopted to describe the non-Newtonian fluids. These non-Newtonian fluid models, known as viscoplastic models, are characterized by the existence of a yield stress. A flow domain needs to be divided into regions where the stress is smaller or larger in magnitude than the yield stress: known as the unsheared region with a plug flow, and the sheared region, respectively. With the rapid development of Micro-Electro-Mechanical Systems (MEMS) fabrication technology, many micro devices are often used involving viscoplastic materials, such as slurries, pastes, bloods, and suspensions etc. The flow of these viscoplastic materials in microchannels, however, has received less attention than they deserve. The present study aims to study EOF of these yield-stress materials. Analytical and numerical solutions are developed for the velocity profile under the condition of a uniform zeta potential of arbitrary values on the channel walls. The objective is to investigate the effect of yield stress on the velocity distribution, by comparing the plug flow velocity of these viscoplastic models with their counterparts with zero yield stress. The results show that no matter which model is employed, the plug flow always dominates the flow domain. Also, the plug flow velocity can be decreased to a different degree by the yield stress, depending on the viscoplastic materials. Acknowledgements This work was financially supported by the Research Grants Council of the Hong Kong Special Administrative Region, China, through projects HKU 715609E and HKU 715510E.
Persistent Identifierhttp://hdl.handle.net/10722/183229

 

DC FieldValueLanguage
dc.contributor.authorNg, COen_US
dc.contributor.authorQi, Cen_US
dc.date.accessioned2013-05-15T01:49:04Z-
dc.date.available2013-05-15T01:49:04Z-
dc.date.issued2013en_US
dc.identifier.citationProceedings of the 17th Annual Conference of Hong Kong Society of Theoretical and Applied Mechanics (HKSTAM 2013) , the 9th Jiangsu-Hong Kong Forum on Mechanics and Its Application (JSTAM), and the 3rd Symposium on the Development of Mechanics, Hong Kong-Macau, China, 22-23 March 2013, p. 15en_US
dc.identifier.urihttp://hdl.handle.net/10722/183229-
dc.description.abstractAbstract: In absence of external applied pressure, the hydrodynamically fully-developed electroosmotic flow (EOF) of non-Newtonian fluids in a slit microchannel is analytically studied. The Casson, Bingham and Herschel-Bulkley models are adopted to describe the non-Newtonian fluids. These non-Newtonian fluid models, known as viscoplastic models, are characterized by the existence of a yield stress. A flow domain needs to be divided into regions where the stress is smaller or larger in magnitude than the yield stress: known as the unsheared region with a plug flow, and the sheared region, respectively. With the rapid development of Micro-Electro-Mechanical Systems (MEMS) fabrication technology, many micro devices are often used involving viscoplastic materials, such as slurries, pastes, bloods, and suspensions etc. The flow of these viscoplastic materials in microchannels, however, has received less attention than they deserve. The present study aims to study EOF of these yield-stress materials. Analytical and numerical solutions are developed for the velocity profile under the condition of a uniform zeta potential of arbitrary values on the channel walls. The objective is to investigate the effect of yield stress on the velocity distribution, by comparing the plug flow velocity of these viscoplastic models with their counterparts with zero yield stress. The results show that no matter which model is employed, the plug flow always dominates the flow domain. Also, the plug flow velocity can be decreased to a different degree by the yield stress, depending on the viscoplastic materials. Acknowledgements This work was financially supported by the Research Grants Council of the Hong Kong Special Administrative Region, China, through projects HKU 715609E and HKU 715510E.-
dc.languageengen_US
dc.publisherHong Kong Society of Theoretical and Applied Mechanics (HKSTAM).en_US
dc.relation.ispartofAnnual Conference of Hong Kong Society of Theoretical and Applied Mechanics (HKSTAM) & Jiangsu-Hong Kong Forum on Mechanics and Its Application (JSTAM) & the Symposium on the Development of Mechanicsen_US
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.titleElectroosmotic Flow of Viscoplastic Fluids Through a Slit Microchannelen_US
dc.typeConference_Paperen_US
dc.identifier.emailNg, CO: cong@hku.hken_US
dc.identifier.authorityNg, CO=rp00224en_US
dc.description.naturepublished_or_final_version-
dc.identifier.hkuros214189en_US
dc.identifier.spage15en_US
dc.identifier.epage15en_US
dc.publisher.placeHong Kong, China-

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