大規模マントル対流の生成機構

概要

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A mechanism for large-scale mantle convection is proposed on the basis of a new asymptotic solution to steady, two-dimensional, free convection at large Rayleigh and infinite Prandtl numbers. In the conventional asymptotic solution the isothermal core flow is mainly driven by the plume buoyances, yielding the Nusselt number proportional to one-third power of the Rayleigh number and inversely proportional to the cell aspect ratio. This solution is valid only for small-scale convection with nearly unit aspect ratio. The new solution which is revealed in the present paper describes the core flow which is mainly driven by the horizontal thermal boundary layer buoyances, and gives a favorable property to base large-scale mantle convection. The predicted Nusselt number is proportional to one-fourth power of the Rayleigh number and inversely proportional to the square root of the aspect ratio.
一般社団法人日本機械学会の論文
1991-11-25