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Numerical study of pressure-driven nitrogen flow in long microchannels for application to electronic cooling
Descriptive
TypeOfResource
Text
TitleInfo
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Title
Numerical study of pressure-driven nitrogen flow in long microchannels for application to electronic cooling
Identifier
ETD_1420
Identifier
(type = hdl)
http://hdl.rutgers.edu/1782.2/rucore10001600001.ETD.000051072
Language
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eng
Genre
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theses
Subject
(ID = SBJ-1);
(authority = RUETD)
Topic
Mechanical and Aerospace Engineering
Subject
(ID = SBJ-1);
(authority = ETD-LCSH)
Topic
Electronic apparatus and appliances--Cooling
Abstract
Two-dimensional models have been developed to investigate pressure-driven laminar nitrogen slip flow in long rectangular microchannels with characteristic lengths ranging from 1.2[mu]m to 50[mu]m and length-to-height ratios up to 2500. The large length-to-height ratio is taken to measure pressure work and viscous dissipation. Rarefaction is incorporated by modifying the boundary conditions at fluid-solid interfaces. To resolve the intense numerical effort required by the large computational domain and the quasi-steady nature of the problem, a parallel SIMPLER-based solver is developed. The influences of variable properties, rarefaction and source terms in energy equation are investigated particularly for the cases with uniform wall heat flux boundary condition and are found to be far from negligible. The thermal and hydraulic characteristics under isothermal and uniform heat flux wall boundary conditions are extensively examined and discussed for pure convection cases. It is shown that the energy taken up by pressure work is dominant over the energy generation by viscous dissipation. Rarefaction is found to influence Nusselt number in two ways: rarefaction reduces Nusselt number through the heat transfer between the wall and bulk fluid, while promotes Nusselt number by affecting the source terms in energy equation. For microchannels of larger dimensions, it is found that rarefaction effects are still significant. The conjugate heat transfer associated with microchannel slip flows is also studied. It is found that axial conduction gives a great impact on the thermal field for substrates with finite thickness. Finally, unsteady convection is studied for a larger-dimension microchannel, where the characteristic response time is found to be greatly influenced by the energy taken up by pressure work.
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electronic resource
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xxiv, 161 p. : ill.
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Note
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Ph.D.
Note
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Includes bibliographical references (p. 155-159)
Note
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by Zhanyu Sun
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Sun
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Zhanyu
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Zhanyu Sun
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Jaluria
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Yogesh
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chair
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Advisory Committee
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Yogesh Jaluria
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Lin
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Hao
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Advisory Committee
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Hao Lin
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Shan
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Jerry
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internal member
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Advisory Committee
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Jerry Shan
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Ozel
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Tugrul
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Advisory Committee
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Tugrul Ozel
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Rutgers University
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degree grantor
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Graduate School - New Brunswick
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school
OriginInfo
DateCreated
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2009
DateOther
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2009-01
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TitleInfo
Title
Rutgers University Electronic Theses and Dissertations
Identifier
(type = RULIB)
ETD
RelatedItem
(type = host)
TitleInfo
Title
Graduate School - New Brunswick Electronic Theses and Dissertations
Identifier
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rucore19991600001
Location
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(displayLabel = Rutgers, The State University of New Jersey)
NjNbRU
Identifier
(type = doi)
doi:10.7282/T3125SXM
Genre
(authority = ExL-Esploro)
ETD doctoral
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Rights
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The author owns the copyright to this work.
Copyright
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Copyright protected
Availability
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Open
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Permission or license
Detail
Non-exclusive ETD license
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Author Agreement License
Detail
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.
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7454720
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