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Modeling electroosmotic and pressure-driven flows in porous microfluidic devices: Zeta potential and porosity changes near the channel walls
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10.1063/1.2335846
/content/aip/journal/jcp/125/9/10.1063/1.2335846
http://aip.metastore.ingenta.com/content/aip/journal/jcp/125/9/10.1063/1.2335846
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Geometry used to determine the flow profile between two parallel plates.

Image of FIG. 2.
FIG. 2.

Normalized volume-averaged flow between two parallel plates, with uncharged walls but a charged packing material, for different permeabilities, for two different applied pressures. For comparison, a plot of the flow for an open channel is illustrated as well. The values , , , and were used. (엯) Open channel, . (+) Open channel, . (⋯) , , , . (-∙-) , , , . (---) , , , .

Image of FIG. 3.
FIG. 3.

Normalized volume-averaged flow between two plates, with charged walls but an uncharged packing material, for different permeabilities. for all cases. (엯) Open channel. (⋯) , , . (-∙-) , , . (---) , , .

Image of FIG. 4.
FIG. 4.

Normalized volume-averaged flow between two plates, with charged walls and a charged packing material, for different permeabilities. For comparison, a plot of the flow for an open channel is illustrated as well. The values , , , , , , and were used. (엯) Open channel. (⋯) , , , . (-∙-) , , , . (---) , , , .

Image of FIG. 5.
FIG. 5.

Normalized volume-averaged flow between two plates, composed of two regions of different permeabilities, with uncharged walls, but a charged packing material. Region 1 is defined as the region , while region 2 is defined as the region . Region 2 had values of , , and . For comparison, a plot of the flow for a porous channel adjacent to an open channel is illustrated as well. The values , , , , and were used. (엯) Region 1, open channel. (⋯) , , , . (-∙-) , , , . (---) , , , .

Image of FIG. 6.
FIG. 6.

Geometry used in the model of a cylinder with two different porous regions.

Image of FIG. 7.
FIG. 7.

The volume-averaged velocity profile in an open capillary column with a porous region near the wall, compared with the velocity profile in a uniform capillary column. The values , , , , , , , , and were used. (엯) Uniform porous material, . (⋯) Open center, porous region near wall, . (●) Open center, porous region near wall, .

Image of FIG. 8.
FIG. 8.

The volume-averaged velocity profile in a capillary column with a region of higher porosity near the wall, compared with the velocity profile in a uniform capillary column. The parameters are the same as those used in Fig. 7. (엯) Uniform porous material, . (⋯) Porous center, higher porosity near wall, . (●) Porous center, higher porosity near wall, .

Image of FIG. 9.
FIG. 9.

Comparison of the volume flow in a porous cylinder using various models for a range of solid particle diameter values. The results are normalized with respect to the Darcy volume flow [Eq. (26)]. The values , , , , , , , , , , , and were used. (⋯) only. (-∙-) Brinkman model. (—) Two region model.

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/content/aip/journal/jcp/125/9/10.1063/1.2335846
2006-09-06
2014-04-18
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Modeling electroosmotic and pressure-driven flows in porous microfluidic devices: Zeta potential and porosity changes near the channel walls
http://aip.metastore.ingenta.com/content/aip/journal/jcp/125/9/10.1063/1.2335846
10.1063/1.2335846
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