Abstract
A model is developed to describe thermal convection in a mixture of fluids in a porous medium, where the layer is heated from below while simultaneously the fluid density at the base of the porous layer is greater than that higher up. In addition to buoyancy forces which are essentially due to gravity the fluid mixture is subject to Korteweg stresses which arise because of density gradients in the mixture. A complete stability analysis is provided and the critical Rayleigh number for convective motion is derived for both stationary and oscillatory convection and this is complemented with a global energy stability analysis. The analogous problem in a bidisperse porous medium is also briefly discussed.
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Acknowledgements
This work was supported by an Emeritus Fellowship of the Leverhulme Trust, EM-2019-022/9. I am indebted to an anonymous referee whose pointed observations led to improvements in an earlier manuscript.
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Straughan, B. Competitive porous double diffusion with Korteweg stress. Ricerche mat 73 (Suppl 1), 293–307 (2024). https://doi.org/10.1007/s11587-023-00790-0
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DOI: https://doi.org/10.1007/s11587-023-00790-0
Keywords
- Thermal convection
- Korteweg stress
- Double diffusion
- Porous convection
- Nonlinear stability
- Energy stability