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DownloadedBy:[UniversityofCaliforniaLosAngeles]At:16:419December2007 Geophysical and Astrophysical Fluid Dynamics,

Summary: DownloadedBy:[UniversityofCaliforniaLosAngeles]At:16:419December2007
Geophysical and Astrophysical Fluid Dynamics,
Vol. 101, Nos. 5­6, October­December 2007, 327­345
Planetary core dynamics and convective heat
transfer scalingy
Department of Earth and Space Sciences, University of California,
Los Angeles, CA. 90095-1567
(Received 30 November 2006; in final form 8 April 2007)
In this article, analysis of a compilation of recent core dynamics models focuses on the
properties of non-magnetic rotating convection. Numerical simulations and laboratory
experiments are shown to agree qualitatively in cases with similar control parameter values.
Small-scale convection columns interact with the spherical shell to generate larger-scale
zonal flows. Comparing quantitative results, heat transfer data is compiled from eight recent
studies of core convection. The data are plotted in terms of Nusselt and Rayleigh
numbers, Nu and Ra, and also in terms of diffusivity-free, modified Nusselt and flux
Rayleigh numbers, NuĆ
and RaĆ
Q. Based on the compiled results, it appears that an
asymptotic scaling law for heat transfer in planetary core convection models has yet to be


Source: Aurnou, Jonathan - Department of Earth and Space Sciences, University of California at Los Angeles


Collections: Geosciences