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Formation of multiple micro-vortices in regions of ion concentration polarization

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TitleInfo
Title
Formation of multiple micro-vortices in regions of ion concentration polarization
Name (type = personal)
NamePart (type = family)
Gowranga Hanasoge
NamePart (type = given)
Srinivas Kumar
NamePart (type = date)
1989-
DisplayForm
Srinivas Kumar Gowranga Hanasoge
Role
RoleTerm (authority = RULIB)
author
Name (type = personal)
NamePart (type = family)
Diez Garias
NamePart (type = given)
Javier
DisplayForm
Javier Diez Garias
Affiliation
Advisory Committee
Role
RoleTerm (authority = RULIB)
chair
Name (type = personal)
NamePart (type = family)
Drazer
NamePart (type = given)
German
DisplayForm
German Drazer
Affiliation
Advisory Committee
Role
RoleTerm (authority = RULIB)
internal member
Name (type = personal)
NamePart (type = family)
Shojaei Zadeh
NamePart (type = given)
Shahab
DisplayForm
Shahab Shojaei Zadeh
Affiliation
Advisory Committee
Role
RoleTerm (authority = RULIB)
internal member
Name (type = corporate)
NamePart
Rutgers University
Role
RoleTerm (authority = RULIB)
degree grantor
Name (type = corporate)
NamePart
Graduate School - New Brunswick
Role
RoleTerm (authority = RULIB)
school
TypeOfResource
Text
Genre (authority = marcgt)
theses
OriginInfo
DateCreated (qualifier = exact)
2014
DateOther (qualifier = exact); (type = degree)
2014-05
Place
PlaceTerm (type = code)
xx
Language
LanguageTerm (authority = ISO639-2b); (type = code)
eng
Abstract (type = abstract)
Ion transport in nano-scale channels is of interest due to their perm-selective behavior, occurring due to the overlap of electric double layers. This leads to a variety of interesting electrokinetic phenomenon in regions around the nano-pores including, ion concentration polarization, field amplified sample stacking and formation of micro vortex instability among others. Incorporating nano-pores within microfluidic systems in functional lab-on-a-chip devices has resulted in techniques for better sample handling, fluid manipulation, and mixing. Effects of concentration polarization on local hydrodynamics was studied experimentally near a nano-porous membrane incorporated in a Micro-channel in this thesis. Along with the formation of depletion and pre-concentration regions in the setup, we observe additional effects of field amplification on local hydrodynamics. We report the direct observation of a primary micro-vortex instability in the depletion region of ICP, along a plane perpendicular to the substrate. This hydrodynamic effect is directly attributed to the non-uniform electro osmotic slip along the micro channel’s bottom wall due to field amplification. In addition to the primary vortex, we also note the formation of a secondary, tertiary and subsequent vortices along the length of the depletion region. A physical model is proposed which considers the two dimensionally varying concentration profile in the depletion region to account for the formation of multiple vortices. The mixing effect of the fast moving primary vortex in a two dimensionally varying concentration profile changes the local concentration in the depletion region. This in turn affects electro-osmotic slip velocity, leading to the formation of multiple vortices. We perform numerical analysis on simpler, slipping wall models, which show excellent agreement with the experimental results.
Subject (authority = RUETD)
Topic
Mechanical and Aerospace Engineering
Subject (authority = ETD-LCSH)
Topic
Electrokinetics
RelatedItem (type = host)
TitleInfo
Title
Rutgers University Electronic Theses and Dissertations
Identifier (type = RULIB)
ETD
Identifier
ETD_5362
PhysicalDescription
Form (authority = gmd)
electronic resource
InternetMediaType
application/pdf
InternetMediaType
text/xml
Note
Supplementary File: Side View
Extent
ix, 52 p. : ill.
Note (type = degree)
M.S.
Note (type = bibliography)
Includes bibliographical references
Note (type = statement of responsibility)
by Srinivas Kumar Gowranga Hanasoge
Subject (authority = ETD-LCSH)
Topic
Ions--Spectra
RelatedItem (type = host)
TitleInfo
Title
Graduate School - New Brunswick Electronic Theses and Dissertations
Identifier (type = local)
rucore19991600001
Location
PhysicalLocation (authority = marcorg); (displayLabel = Rutgers, The State University of New Jersey)
NjNbRU
Identifier (type = doi)
doi:10.7282/T3CJ8BSH
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The author owns the copyright to this work.
RightsHolder (type = personal)
Name
FamilyName
Gowranga Hanasoge
GivenName
Srinivas Kumar
Role
Copyright Holder
RightsEvent
Type
Permission or license
DateTime (encoding = w3cdtf); (qualifier = exact); (point = start)
2014-03-24 12:27:55
AssociatedEntity
Name
Srinivas Kumar Gowranga Hanasoge
Role
Copyright holder
Affiliation
Rutgers University. Graduate School - New Brunswick
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Name
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I hereby grant to the Rutgers University Libraries and to my school the non-exclusive right to archive, reproduce and distribute my thesis or dissertation, in whole or in part, and/or my abstract, in whole or in part, in and from an electronic format, subject to the release date subsequently stipulated in this submittal form and approved by my school. I represent and stipulate that the thesis or dissertation and its abstract are my original work, that they do not infringe or violate any rights of others, and that I make these grants as the sole owner of the rights to my thesis or dissertation and its abstract. I represent that I have obtained written permissions, when necessary, from the owner(s) of each third party copyrighted matter to be included in my thesis or dissertation and will supply copies of such upon request by my school. I acknowledge that RU ETD and my school will not distribute my thesis or dissertation or its abstract if, in their reasonable judgment, they believe all such rights have not been secured. I acknowledge that I retain ownership rights to the copyright of my work. I also retain the right to use all or part of this thesis or dissertation in future works, such as articles or books.
Copyright
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Copyright protected
Availability
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Open
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Permission or license
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