Theses and Dissertations from UMD

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New submissions to the thesis/dissertation collections are added automatically as they are received from the Graduate School. Currently, the Graduate School deposits all theses and dissertations from a given semester after the official graduation date. This means that there may be up to a 4 month delay in the appearance of a give thesis/dissertation in DRUM

More information is available at Theses and Dissertations at University of Maryland Libraries.

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Author: search.filters.author.Wimert, Jesse TylerSubject: search.filters.subject.Multiparticle

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    A Semianalytical, Three Dimensional Model of Microstructure in Multiparticle, Multiphase Flow
    (2011) Wimert, Jesse Tyler; Hier-Majumder, Saswata; Geology; Digital Repository at the University of Maryland; University of Maryland (College Park, Md.)
    This dissertation presents a three dimensional microgeodynamic model of grain-melt geometry in partially molten rocks. The isotropic unit cell of the partially molten rock is characterized by a face-centered-cubic symmetry, consisting of rhombic dodecahedral grains. The variation of surface tension between grain-grain and grain-melt contacts excites a coupled viscous flow within grains and the interstitial melt leading to a steady-state grain-melt geometry. The fractional area of intergranular contact, contiguity, is obtained from these models as a function of melt volume fraction, for melt fractions between 0.05 and 0.25. Comparison with previous results indicates that the contiguity in three dimensional models is lower than two dimensional models. We apply our model to the UltraLow Velocity Zones (ULVZ) in the Earth's core-mantle boundary. The observed seismic signature of the ULVZ can be explained by a melt volume fraction between 0.08 and 0.12.