Onset of convection with temperature- and depth-dependent viscosity

Details Onset of convection with temperature- and depth-dependent viscosity Onset of convection with temperature- and depth-dependent viscosity

Oct 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002georl..29s..29k&link_type=abstract

Geophysical Research Letters, Volume 29, Issue 19, pp. 29-1, CiteID 1923, DOI 10.1029/2002GL015672

Physics

Geophysics

4

Marine Geology And Geophysics: Midocean Ridge Processes, Tectonophysics: Dynamics, Convection Currents And Mantle Plumes, Tectonophysics: Rheology-Mantle

Scientific paper

We derive a scaling law for the onset of convection in an incompressible fluid cooled from above with temperature- and depth-dependent viscosity, on the basis of 2-D numerical simulation. Rayleigh numbers up to 107 are considered. The activation energy is varied from 0 to 200 kJ mol-1, and a variation of up to 103 is considered in depth-dependent reference viscosity. Our scaling law is shown to be able to handle a variety of buoyancy distributions, including highly non-Gaussian and multimodal distributions, with a tightly constrained critical Rayleigh number.

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