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dc.contributor.advisorPohlman, Nicholas A.en_US
dc.contributor.authorSpitulnik, Adam N.en_US
dc.date.accessioned2019-11-26T20:24:18Z
dc.date.available2019-11-26T20:24:18Z
dc.date.issued2016
dc.identifier.urihttps://commons.lib.niu.edu/handle/10843/21178
dc.descriptionAdvisors: Nicholas A. Pohlman.en_US
dc.descriptionCommittee members: Pradip Majumdar; John Shelton.en_US
dc.descriptionIncludes bibliographical references.en_US
dc.descriptionIncludes illustrations.en_US
dc.description.abstractSimulations of granular flow assume a consistent flowing layer profile observed in circular tumblers that were half full. While the constant shear rate model predicts mixing kinematics adequately, the model has not been empirically tested in systems where the erosion from the solid body has velocity components along the dynamic angle of repose. This thesis explores experiments that analyze the relationship be- tween tumbler fill fraction and the kinematics of the erosion boundary transition into the flowing layer. Tumblers greater than 50% full have inertial velocity along the angle of repose; fill conditions less than 50% enter with velocity opposite the free surface angle. Results confirm that flowing layer chord length alone properly scales flowing layer depth only when fill fraction is near 50%; otherwise fill fraction must be considered. This is due to the streamwise velocity of particles at the erosion boundary affecting the energy balance of the system. In addition the asymmetric velocity profile derived from the non-dimensional momentum equation is confirmed for non half full systems. Lastly, linear and exponential shear models are explored and shown to be qualitatively similar; variation is only exhibited at extreme fill and positions.en_US
dc.format.extent63 pagesen_US
dc.language.isoengen_US
dc.publisherNorthern Illinois Universityen_US
dc.rightsNIU theses are protected by copyright. They may be viewed from Huskie Commons for any purpose, but reproduction or distribution in any format is prohibited without the written permission of the authors.en_US
dc.subject.lcshGranular materials--Fluid dynamicsen_US
dc.titleErosion boundary effects due to fill fraction variation : a study of quasi 2D tumblers of granular systemsen_US
dc.type.genreDissertation/Thesisen_US
dc.typeTexten_US
dc.contributor.departmentDepartment of Mechanical Engineeringen_US
dc.description.degreeM.S. (Master of Science)en_US


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