期刊
PHYSICS OF THE EARTH AND PLANETARY INTERIORS
卷 141, 期 1, 页码 3-8出版社
ELSEVIER
DOI: 10.1016/j.pepi.2003.08.005
关键词
planetary cores; core-mantle interaction; turbulent viscosity; geodynamo
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. (C) 2003 Elsevier B.V. All rights reserved.
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