Flow and heat transfer properties of Mono Craters rhyolites: effects of temperature, water content, and crystallinity

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Flow and heat transfer properties of Mono Craters rhyolites: effects of temperature, water content, and crystallinity

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dc.contributor.advisor Whittington, Alan G. en_US
dc.contributor.author Romine, William en_US
dc.coverage.spatial California -- Mono Craters
dc.date.accessioned 2010-02-23T17:14:06Z
dc.date.available 2010-02-23T17:14:06Z
dc.date.issued 2008 en_US
dc.date.submitted 2008 Fall en
dc.identifier.other RomineW-111008-T11931 en_US
dc.identifier.uri http://hdl.handle.net/10355/5685
dc.description The 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.description Title from PDF of title page (University of Missouri--Columbia, viewed on October 5, 2009). en_US
dc.description Thesis advisor: Dr. Alan G. Whittington. en_US
dc.description Includes bibliographical references. en_US
dc.description M.S. University of Missouri--Columbia 2008. en_US
dc.description Dissertations, Academic -- University of Missouri--Columbia -- Geological sciences. en_US
dc.description.abstract The nature of volcanic processes, including rate of magma ascent, exsolution of volatiles, eruption style, and flow distance, is highly dependent on the viscosity of the associated magma and its ability to transfer heat. We present measurements of the viscosity and thermal diffusivity of Quaternary rhyolitic lava flows from Mono Craters, California. We quantify the effects of temperature, dissolved water content, and crystallinity on viscosity and thermal diffusivity. We use the parallel plate and concentric cylinder methods to obtain viscosity measurements between 5 x 103̂ to 8 x 101̂2 Pas, from superliquidus conditions to the glass transition; the laser flash (LFA) method to measure thermal diffusivity of samples between room and subliquidus temperatures. The investigated obsidian samples, collected from three different flow lobes, contain between 0.1 and 1.1 wt.% H2O, and less than 2 vol.% crystals. We also remelted one sample from each lobe in a muffle furnace to produce nearly anhydrous, crystal free glass. We fit our viscosity data to four literature models relevant to rhyolitic melts, two developed specifically for rhyolites and two global models. We add to this by presenting our own models based on the empirical TVF equation and the theory-based Adam-Gibbs equation, finding that the Adam- Gibbs model fits our data slightly better. We also present a model relating the thermal diffusivity of the samples to their crystal contents and temperatures below the glass transition. Water has a negligible effect on thermal diffusivity at the low concentrations in the samples studied. en_US
dc.language.iso en_US en_US
dc.publisher University of Missouri--Columbia en_US
dc.relation.ispartof 2008 Freely available theses (MU) en_US
dc.subject.lcsh Heat -- Transmission en_US
dc.subject.lcsh Thermal diffusivity en_US
dc.subject.lcsh Rhyolite en_US
dc.subject.lcsh Volcanic ash, tuff, etc. -- Viscosity en_US
dc.title Flow and heat transfer properties of Mono Craters rhyolites: effects of temperature, water content, and crystallinity en_US
dc.type Thesis en_US
thesis.degree.discipline Geological sciences en_US
thesis.degree.grantor University of Missouri--Columbia en_US
thesis.degree.name M.S. en_US
thesis.degree.level Masters en_US
dc.identifier.merlin .b7154639x en_US
dc.identifier.oclc 449231138 en_US
dc.relation.ispartofcommunity University of Missouri-Columbia. Graduate School. Theses and Dissertations. Theses. 2008 Theses


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