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• W2151603927 abstract "Recent convection calculations have demonstrated that an endothermic phase transition can greatly decrease the vertical flow through the transition in a convecting system, in some cases leading to a layered flow. Using reasonable estimates of both the Rayleigh number and Clapeyron slope of the spinel to perovskite plus magnesiowüstite phase change, these results suggest that the 670‐km phase change has a strong effect on mantle convection. This so‐called “dynamic layering” phenomenon is further investigated with a compressible finite element code using a two‐dimensional, Cartesian geometry. We find a weak sensitivity of the pattern of flow to the form of the equations, considering Boussinesq, extended Boussinesq, and anelastic compressible forms of the governing equations, assuming that the thermodynamic properties (thermal expansivity, heat capacity, and latent heat) remain constant. The pattern of flow, however, depends strongly on the initial conditions, boundary conditions and equation of state. We compare the simple equation‐of‐state formulations used in previous work with a self‐consistent equation of state based on Debye and Birch‐Murnaghan finite strain theory under a Mie‐Grüneisen formulation. A thermal expansion coefficient that decreases monotonically with depth and is unaffected by changes in phase or temperature greatly enhances dynamic layering. This trend is reversed when the temperature, pressure, and phase dependence of thermodynamic properties such as thermal expansivity, entropy, and heat capacity is introduced. At moderate Rayleigh numbers, the pattern of the flow is strongly influenced by the pattern of the initial condition (i.e., the location of upwellings and downwellings); however, it is not sensitive to the thickness of the initial thermal boundary layers. The sensitivity of the flow to the pattern of the initial condition can potentially bias mass fluxes, especially for moderate Rayleigh number calculations." @default.
• W2151603927 created "2016-06-24" @default.
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• W2151603927 date "1994-08-10" @default.
• W2151603927 modified "2023-09-30" @default.
• W2151603927 title "Sensitivity of convection with an endothermic phase change to the form of governing equations, initial conditions, boundary conditions, and equation of state" @default.
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• W2151603927 doi "https://doi.org/10.1029/94jb00852" @default.
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