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• W1963624887 abstract "A number of finite-element calculations of convection in a variable-viscosity fluid have been carried out to investigate the effects of non-Newtonian flow when rheology is also subject to a strong temperature and pressure influence. A variety of cases has been studied in the range of effective Rayleigh numbers between 104 and 106, including different modes of heating and a range of values for activation energy and activation volume. Power-law creep with a stress exponent of 3 turns out to lead to considerably different flow pattern and heat transfer properties than Newtonian rheology. In general, the effect is to reduce viscosity contrasts imposed by p,T dependence, which can lead in some circumstances to the mobilisation of otherwise stagnant regions within the cell. The properties of non-Newtonian flow can be closely imitated by a Newtonian fluid with a reduced value of the activation enthalpy bH* with b≅0.3–0.5. It appears possible that non-Newtonian rheology plays a key role in determining the convective style in a planetary mantle." @default.
• W1963624887 created "2016-06-24" @default.
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• W1963624887 date "1983-07-01" @default.
• W1963624887 modified "2023-10-17" @default.
• W1963624887 title "Convection in a variable-viscosity fluid: Newtonian versus power-law rheology" @default.
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• W1963624887 doi "https://doi.org/10.1016/0012-821x(83)90060-2" @default.
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