Viscosity and thermal fields associated with strongly chaotic non-Newtonian thermal convection

Details Viscosity and thermal fields associated with strongly chaotic non-Newtonian thermal convection Viscosity and thermal fields associated with strongly chaotic non-Newtonian thermal convection

Jan 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992georl..19..127m&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 19, Jan. 24, 1992, p. 127-130. Research supported by NASA.

Physics

9

Earth Mantle, Free Convection, Geophysical Fluids, Geotemperature, Nonnewtonian Fluids, Viscosity, Fractals, Stagnation Point, Temperature Distribution, Time Dependence, Turbulent Flow

Scientific paper

The thermomechanical structure is investigated in strongly chaotic non-Newtonian thermal convection for both base-heated and internally-heated systems. Temperature can build up in stagnant regions and a non-Newtonian mantle can tolerate less internal heating. Viscosity fields of the strongly chaotic regime show a granular structure. The horizontal spectra of viscosity fluctuations obey a power-law and yield a fractal dimension of 1.6 to 1.8 for the isoviscosity lines, providing evidence for 2D turbulence. Long-wavelength viscosity variations are smoothed out by the turbulent non-Newtonian flows.

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