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dc.contributor.advisorBryan, James E., 1964-eng
dc.contributor.authorFeng, Xin, 1978-eng
dc.date.issued2007eng
dc.date.submitted2007 Falleng
dc.descriptionThe entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file.eng
dc.descriptionTitle from title screen of research.pdf file (viewed on March 10, 2009)eng
dc.descriptionIncludes bibliographical references.eng
dc.descriptionThesis (Ph.D.) University of Missouri-Columbia 2007.eng
dc.descriptionDissertations, Academic -- University of Missouri--Columbia -- Mechanical and aerospace engineering.eng
dc.description.abstractAmong the thermal management solutions for power electronics, two-phase jet or spray impingement cooling are two promising candidates. In this study, electrohydrodynamic atomization (EHDA) method is used to generate spray and jet from the same capillary. This approach enables us to compare the heat transfer coefficient and critical heat flux (CHF) in consistent conditions. Two nondimensional parameters are first developed to lay out the various EHDA modes of ethanol. The experimental results show that the EHDA cooling could enhance the heat transfer coefficient in most conditions, while it could not benefit CHF because the electric repulsive force causes a wide spray angle and less impinging mass flux on the surface. Single and multi micro jet impingement cooling (MJIC) are investigated. Based on the experimental observation and analytical works, a semi-theoretical CHF correlation is proposed based on force and energy balance. The experimental data of water and ethanol are predicted very well by the new model. It also shows the potential to explain the unique feature on the CHF curves of saturated HFE7000 and subcooled ethanol. By using multi MJIC, heat transfer coefficient and CHF might be improved, which mainly depend on fluids and testing conditions.eng
dc.identifier.merlinb66631956eng
dc.identifier.oclc314148075eng
dc.identifier.urihttps://hdl.handle.net/10355/4853
dc.identifier.urihttps://doi.org/10.32469/10355/4853eng
dc.languageEnglisheng
dc.publisherUniversity of Missouri--Columbiaeng
dc.relation.ispartofcollectionUniversity of Missouri--Columbia. Graduate School. Theses and Dissertationseng
dc.subjectelectrohydrodynamic atomization (EHDA) ; critical heat flux (CHF)eng
dc.subjectelectrohydrodynamic atomization (EHDA) ; critical heat flux (CHF)eng
dc.subject.lcshPower electronicseng
dc.subject.lcshHeat fluxeng
dc.subject.lcshHeat -- Transmissioneng
dc.titleExperimental and analytical study on two-phase impingement cooling with and without electric fieldeng
dc.typeThesiseng
thesis.degree.disciplineMechanical and aerospace engineering (MU)eng
thesis.degree.grantorUniversity of Missouri--Columbiaeng
thesis.degree.levelDoctoraleng
thesis.degree.namePh. D.eng


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