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• W2614573214 abstract "The combined effects of buoyancy-driven Rayleigh-B'{e}nard convection (RC) and surface tension-driven Marangoni convection (MC) are studied in a triple-layer configuration which serves as a simplified model for a liquid metal battery (LMB). The three-layer model consists of a liquid metal alloy cathode, a molten salt separation layer, and a liquid metal anode at the top. Convection is triggered by the temperature gradient between the hot electrolyte and the colder electrodes, which is a consequence of the release of resistive heat during operation. We present a linear stability analysis of the state of pure thermal conduction in combination with three-dimensional direct numerical simulations of the nonlinear turbulent evolution on the basis of a pseudospectral method. Five different modes of convection are identified in the configuration, which are partly coupled to each other: RC in the upper electrode, RC with internal heating in the molten salt layer, MC at both interfaces between molten salt and electrode as well as anti-convectionin the middle layer and lower electrode. The linear stability analysis confirms that the additional Marangoni effect in the present setup increases the growth rates of the linearly unstable modes, i.e. Marangoni and Rayleigh-B'{e}nard instability act together in the molten salt layer. The critical Grashof and Marangoni numbers decrease with increasing middle layer thickness. The calculated thresholds for the onset of convection are found for realistic current densities of laboratory-sized LMBs. The global turbulent heat transfer follows scaling predictions for internally heated RC. The global turbulent momentum transfer is comparable with turbulent convection in the classical Rayleigh-B'{e}nard case." @default.
• W2614573214 created "2017-05-26" @default.
• W2614573214 creator A5008993197 @default.
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• W2614573214 date "2017-05-25" @default.
• W2614573214 modified "2023-09-30" @default.
• W2614573214 title "Thermal Rayleigh-Marangoni convection in a three-layer liquid-metal-battery model" @default.
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• W2614573214 doi "https://doi.org/10.1103/physreve.95.053114" @default.
• W2614573214 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/28618570" @default.
• W2614573214 hasPublicationYear "2017" @default.
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