Turbulent viscosity measurements relevant to planetary core-mantle dynamics |
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| Authors: | Daniel Brito Jonathan Aurnou Philippe Cardin |
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| Institution: | a LGIT, Observatoire des Sciences de l’Univers de Grenoble, Grenoble, France
b Department of Terrestrial Magnetism, Carnegie Institution of Washington, Washington, USA |
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| Abstract: | Laboratory experiments that combine thermal convection in a rapidly rotating shell with a sudden increase of the shell’s rotation rate (spin-up) enable us to study processes related to turbulent viscous coupling between planetary fluid cores and solid mantles. We experimentally measure the large-scale effective viscosity by determining how the synchronisation time between the fluid and the shell (called the spin-up time) is shortened when convective turbulence exists in the bulk of the fluid. Our experiments suggest that viscous core-mantle coupling in planets may be greater than has been previously estimated using molecular viscosity values. |
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| Keywords: | Planetary cores Core-mantle interaction Turbulent viscosity Geodynamo |
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