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Measurement of near-surface void fraction and macrolayer thickness in boiling water and silica-based nanofluid

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dc.contributor.advisor Jacopo Buongiorno and Lin-Wen Hu. en_US
dc.contributor.author Lerch Andrew (Andrew J.) en_US
dc.contributor.other Massachusetts Institute of Technology. Dept. of Nuclear Science and Engineering. en_US
dc.date.accessioned 2009-03-16T19:49:31Z
dc.date.available 2009-03-16T19:49:31Z
dc.date.copyright 2008 en_US
dc.date.issued 2008 en_US
dc.identifier.uri http://hdl.handle.net/1721.1/44839
dc.description Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Nuclear Science and Engineering, 2008. en_US
dc.description Includes bibliographical references (leaves 48-49). en_US
dc.description.abstract Nanofluids are engineered fluids that contain a suspension of nanoparticles in a pure substance. Nanoparticles can be any variety of metals, metal oxides, or ceramics. They have been shown to increase heat transfer properties such as thermal conductivity, convective heat transfer, and critical heat flux(CHF). An optical probe used to detect phase was used to measure the void fraction during boiling, from which the macrolayer thickness can be derived. The optical probe was verified to have an error of 11.9% and 10.4% for measuring bubble diameter in water and R-123, respectively, and an error of 5.2% and 7.1% for measuring velocity in water and R-123. The macrolayer dryout theory of CHF was tested by investigating the change in macrolayer thickness for different heat fluxes in de-ionized (DI) water and 0.01% (by volume) SiO₂nanofluid. A current controlled power source heated a sandblasted, stainless steel plate resting in an isothermal bath. The silica nanofluid had a CHF enhancement of 82% over the DI water along with a slightly higher (20% enhancement) heat transfer coefficient. The macrolayer thickness, as measured by the optical probe, at a comparable heat flux was much larger than the DI water, possibly due to the increased wettability of the heater caused by the deposition of nanoparticles on the heater. This trend is in agreement with prediction of existing theory. en_US
dc.description.statementofresponsibility by Andrew Lerch. en_US
dc.format.extent 49 leaves en_US
dc.language.iso eng en_US
dc.publisher Massachusetts Institute of Technology en_US
dc.rights M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission. en_US
dc.rights.uri http://dspace.mit.edu/handle/1721.1/7582 en_US
dc.subject Nuclear Science and Engineering. en_US
dc.title Measurement of near-surface void fraction and macrolayer thickness in boiling water and silica-based nanofluid en_US
dc.type Thesis en_US
dc.description.degree S.B. en_US
dc.contributor.department Massachusetts Institute of Technology. Dept. of Nuclear Science and Engineering. en_US
dc.identifier.oclc 301581454 en_US


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