Buoyancy-driven destabilization of an immersed granular bed

Abstract : Under suitable conditions, an immersed granular bed can be destabilized by local thermal forcing and the induced buoyant force. The destabilization is evident from the triggering and establishment of a dense fluid-like granular plume. Varying the initial granular layer average height h, time series of the free layer surface are extracted, allowing us to dynamically compute the underlying volume of the granular layer. The initial interface deformation, the lowering of the average granular interface (i.e. decrease of the granular layer volume) and the emission of a plume are observed and analyzed. We show that the phenomenon is mainly driven by heat transfer, for large h and also involves variable height thermal boundary condition & Darcy's flow triggering, for small h. Simple modeling with no adjustable parameter not only allows us to capture the observed scaling power laws but is also in quantitative agreement with the obtained experimental data.
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Journal of Fluid Mechanics, Cambridge University Press (CUP), 2018, 843, pp.778 - 809. 〈10.1017/jfm.2018.141〉
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Dernière modification le : mercredi 4 juillet 2018 - 01:18:42

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Éric Herbert, Cyprien Morize, Aurélie Louis-Napoléon, Christophe Goupil, Pierre Jop, et al.. Buoyancy-driven destabilization of an immersed granular bed. Journal of Fluid Mechanics, Cambridge University Press (CUP), 2018, 843, pp.778 - 809. 〈10.1017/jfm.2018.141〉. 〈hal-01744697〉

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