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Conference Paper: Combined Pressure-Driven and Electroosmotic Flow of Casson Fluid through a Slit Channel
Title | Combined Pressure-Driven and Electroosmotic Flow of Casson Fluid through a Slit Channel |
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Authors | |
Keywords | Electroosmotic flow electric double layer Casson fluid viscoplastic yield stress |
Issue Date | 2013 |
Citation | The 14th Asian Congress of Fluid Mechanics (14 ACFM), Hanoi-Halong, Vietnam, 15-19 October 2013. In Proceedings of the 14th Asian Congress of Fluid Mechanics (14ACFM), 2013, p. 1069–1075, abstract no. 18. 01 How to Cite? |
Abstract | Analytical solutions are developed for steady electroosmotic (EO) flow of a Casson fluid through a
parallel-plate microchannel. The flow is driven by electric as well as pressure forcings. A very thin
electric double layer is assumed, and the Debye-Hückel approximation is used. A first step of the
analysis is to locate the yield surface, which divides the flow section into sheared and unsheared
regions. Different combinations of the electric and pressure forcings can lead to different types of
distribution of stress relative to the yield stress. In this study, integrals of the nonlinear coupling
terms of the two forcings are analytically expressed by uniformly valid approximations derived
using the boundary-layer theory. It is shown that even a small value of the Casson yield stress can
considerably reduce the rate of flow of the fluid through a microchannel by electroosmosis. The
decreasing effect of the yield stress on the flow is intensified by the presence of a pressure gradient,
whether favorable or adverse. |
Description | Parallel Session 31: Topic: Non-newtonian Flows |
Persistent Identifier | http://hdl.handle.net/10722/194997 |
DC Field | Value | Language |
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dc.contributor.author | Ng, CO | en_US |
dc.date.accessioned | 2014-02-21T06:45:34Z | - |
dc.date.available | 2014-02-21T06:45:34Z | - |
dc.date.issued | 2013 | en_US |
dc.identifier.citation | The 14th Asian Congress of Fluid Mechanics (14 ACFM), Hanoi-Halong, Vietnam, 15-19 October 2013. In Proceedings of the 14th Asian Congress of Fluid Mechanics (14ACFM), 2013, p. 1069–1075, abstract no. 18. 01 | en_US |
dc.identifier.uri | http://hdl.handle.net/10722/194997 | - |
dc.description | Parallel Session 31: Topic: Non-newtonian Flows | - |
dc.description.abstract | Analytical solutions are developed for steady electroosmotic (EO) flow of a Casson fluid through a parallel-plate microchannel. The flow is driven by electric as well as pressure forcings. A very thin electric double layer is assumed, and the Debye-Hückel approximation is used. A first step of the analysis is to locate the yield surface, which divides the flow section into sheared and unsheared regions. Different combinations of the electric and pressure forcings can lead to different types of distribution of stress relative to the yield stress. In this study, integrals of the nonlinear coupling terms of the two forcings are analytically expressed by uniformly valid approximations derived using the boundary-layer theory. It is shown that even a small value of the Casson yield stress can considerably reduce the rate of flow of the fluid through a microchannel by electroosmosis. The decreasing effect of the yield stress on the flow is intensified by the presence of a pressure gradient, whether favorable or adverse. | - |
dc.language | eng | en_US |
dc.relation.ispartof | Asian Congress of Fluid Mechanics | en_US |
dc.subject | Electroosmotic flow | - |
dc.subject | electric double layer | - |
dc.subject | Casson fluid | - |
dc.subject | viscoplastic yield stress | - |
dc.title | Combined Pressure-Driven and Electroosmotic Flow of Casson Fluid through a Slit Channel | en_US |
dc.type | Conference_Paper | en_US |
dc.identifier.email | Ng, CO: cong@hku.hk | en_US |
dc.identifier.authority | Ng, CO=rp00224 | en_US |
dc.identifier.hkuros | 228039 | en_US |
dc.identifier.spage | 1069, abstract no. 18. 01 | en_US |
dc.identifier.epage | 1075, abstract no. 18. 01 | en_US |