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dc.contributor.advisorGhosh, Tushar K., Dr.en_US
dc.contributor.authorMaynard, Raymond K.
dc.date.issued2011
dc.date.submitted2011 Summeren_US
dc.description"July 2011"en_US
dc.descriptionThe entire thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file; a non-technical public abstract appears in the public.pdf file.en_US
dc.descriptionTitle from PDF of title page (University of Missouri--Columbia, viewed on May 17, 2012).en_US
dc.descriptionDissertation advisor: Dr. Tushar K. Ghoshen_US
dc.descriptionVita.en_US
dc.descriptionIncludes bibliographical references.en_US
dc.descriptionDissertations, Academic -- University of Missouri--Columbia -- Nuclear engineering.en_US
dc.description.abstractAn experimental system was constructed in accordance with the standard ASTM C835-06 to measure the total hemispherical emissivity of structural materials of interest in Very High Temperature Reactor (VHTR) systems. The system was tested with 304 stainless steel as well as oxidized and un-oxidized nickel, and good reproducibility and agreement with the literature data was found. Emissivity of each candidate material was measured over a wide range of temperatures, with conditions that included: i) 'as received' (original sample) from the supplier; ii) increased surface roughness; iii) oxidized, and; iv) graphite coated. The emissivity of as-received materials increased with temperature for Hastelloy X (from 0.18 at 473 K to 0.28 at 1498 K), Haynes 230 (from 0.178 at 600 K to 0.235 at 1375 K), and Alloy 617 (about 0.2 at 600 K to about 0.35 at 1275 K). Oxidation was found to increase emissivity, but as there is some oxidation of these materials used in the construction of VHTRs, this represents an essentially neutral finding in terms of the safety implications in post-accident VHTR environments. However, a coating of graphite powder was shown to substantially increase emissivity, and this has strong favorable safety implications in terms of decay heat removal in post-accident VHTR environments.en_US
dc.format.extentxi, 74 pagesen_US
dc.identifier.otherMarynardR-072611-D600
dc.identifier.urihttp://hdl.handle.net/10355/14216
dc.publisherUniversity of Missouri--Columbiaen_US
dc.relation.ispartof2011 Freely available dissertations (MU)en_US
dc.relation.ispartofcommunityUniversity of Missouri-Columbia. Graduate School. Theses and Dissertations. Dissertations. 2011 Dissertations
dc.subjectnext generation nuclear reactoren_US
dc.subjectvery high temperature reactorsen_US
dc.subjectenergy productionen_US
dc.subjectemissivityen_US
dc.titleTotal hemispherical emissivity of very high temperature reactor (VHTR) candidate materials: Hastelloy X, Haynes 230, and Alloy 617en_US
dc.typeThesisen_US
thesis.degree.disciplineNuclear engineeringen_US
thesis.degree.disciplineNuclear engineeringeng
thesis.degree.grantorUniversity of Missouri--Columbiaen_US
thesis.degree.levelDoctoralen_US
thesis.degree.namePh. D.en_US


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