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Full Record Details
Persistent URL
http://purl.org/net/epubs/work/34590
Record Status
Checked
Record Id
34590
Title
An analysis of induced pressure fields in electroosmotic flows through microchannels
Contributors
Y Zhang (CCLRC Daresbury Lab.)
,
X-J Gu (CCLRC Daresbury Lab.)
,
RW Barber (CCLRC Daresbury Lab.)
,
DR Emerson (CCLRC Daresbury Lab.)
Abstract
Induced pressure gradients are found to cause band-broadening effects which are important to the performance of microfluidic devices, such as capillary electrophoresis and capillary chromatography. An improved understanding of the underlying mechanisms causing an induced pressure gradient in electroosmotic flows is presented. The analysis shows that the induced pressure distribution is the key to understanding the experimentally observed phenomena of leakage flows. A novel way of determining the static pressures at the inlet and outlet of microchannels is also presented that takes account of the pressure losses due to flow contraction and expansion. These commonly neglected pressure losses at the channel entrance and outlet are shown to be important in accurately describing the flow. The important parameters that define the effect of induced pressure on the flows are discussed, which may facilitate the design of improved microfluidic devices. The present model clearly identifies the mechanism behind the experimentally observed leakage flows, which is further confirmed by numerical simulations. Not only can the leakage flow occur from the electric-field-free side channel to the main channel, but also the fluid in the main channel can be attracted into the side channel by the induced pressure gradient.
Organisation
CCLRC
,
CSE
,
CSE-CEG
Keywords
Funding Information
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Language
English (EN)
Type
Details
URI(s)
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Year
Journal Article
J Coll Int Sci
275, no. 2 (2004): 670-678.
doi:10.1016/j.jcis.2004.02.052
2004
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