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Liquid sodium model of Earth's outer core

dc.contributor.advisorLathrop, Daniel P.en_US
dc.contributor.authorShew, Woodrow Leeen_US
dc.date.accessioned2004-10-09T05:20:09Z
dc.date.available2004-10-09T05:20:09Z
dc.date.issued2004-08-27en_US
dc.identifier.urihttp://hdl.handle.net/1903/1890
dc.description.abstractConvective motions in Earth's outer core are responsible for the generation of the geomagnetic field. We present liquid sodium convection experiments in a spherical vessel, designed to model the convective state of Earth's outer core. Heat transfer, zonal fluid velocities, and properties of temperature fluctuations were measured for different rotation rates and temperature drops across the convecting sodium. The small scale fluid motion was highly turbulent, despite the fact that less than half of the total heat transfer was due to convection. Retrograde zonal velocities were measured at speeds up to 0.02 times the tangential speed of the outer wall of the vessel. Power spectra of temperature fluctuations indicate a well defined knee characterizing the convective energy input. This frequency is proportional to the ballistic velocity estimate. In the context of Earth's outer core, our observations imply a thermal Rayleigh number Ra=10^22, a convective velocity near 10^-5 m/s, and length and time scales of convective motions of 100 m and 2 days.en_US
dc.format.extent1860784 bytes
dc.format.mimetypeapplication/pdf
dc.language.isoen_US
dc.titleLiquid sodium model of Earth's outer coreen_US
dc.typeDissertationen_US
dc.contributor.publisherDigital Repository at the University of Marylanden_US
dc.contributor.publisherUniversity of Maryland (College Park, Md.)en_US
dc.contributor.departmentPhysicsen_US
dc.subject.pqcontrolledPhysics, Fluid and Plasmaen_US
dc.subject.pqcontrolledGeophysicsen_US
dc.subject.pquncontrolledexperimenten_US
dc.subject.pquncontrolledEarthen_US
dc.subject.pquncontrolledouter coreen_US
dc.subject.pquncontrolleddynamoen_US
dc.subject.pquncontrolledconvectionen_US
dc.subject.pquncontrolledrotatingen_US


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