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Article Dans Une Revue Magnetohydrodynamics c/c of Magnitnaia Gidrodinamika Année : 2017

Metal pad roll instability in liquid metal batteries

Résumé

The increasing deployment of renewable energies requires three fundamental change to the electric grid: more transmission lines, a flexibilization of the demand and grid scale energy storage. Liquid metal batteries (LMBs) are considered these days as a promising means of stationary energy storage. Built as a stable density stratification of two liquid metals separated by a liquid salt, LMBs have three main advantages: a low price, a long life-time and extremely high current densities. In order to be cheap, LMBs have to be built large. However, battery currents of the order of kilo-amperes may lead to magnetohydrodynamic (MHD) instabilities, which – in the worst case – may short-circuit the thin electrolyte layer. The metal pad roll instability, as known from aluminium reduction cells, is considered as one of the most dangerous phenomena for LMBs. We develop a numerical model, combining fluid- and electrodynamics with the volume-of-fluid method, to simulate this instability in cylindrical LMBs. We explain the instability mechanism similar to that in aluminium reduction cells and give some first results, including growth rates and oscillation periods of the instability

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Dates et versions

hal-02365446 , version 1 (15-11-2019)

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Citer

Norbert Weber, Pascal Beckstein, Vladimir Galindo, Wietze Herreman, Caroline Nore, et al.. Metal pad roll instability in liquid metal batteries. Magnetohydrodynamics c/c of Magnitnaia Gidrodinamika, 2017, 53 (1), pp.129-140. ⟨10.22364/mhd.53.1.14⟩. ⟨hal-02365446⟩
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