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Article Dans Une Revue Journal of Fluid Mechanics Année : 2021

Chaos in a melting pot

Résumé

A novel flow instability emerging during a rheometric flow of a phase change material sheared in the vicinity of the melting point is reported. Right above the onset of the flow-induced crystallisation, the presence of the crystals in the flow leads to a primary bifurcation towards an oscillatory flow state. A further decrease of the temperature beyond this point leads to an increase of both the volume fraction and the size of the crystals, which ultimately triggers a fully developed chaotic flow. A full stability diagram as a function of the imposed deformation rate and the temperature is obtained experimentally. The systematic experimental observations reported herein could trigger further studies of the hydrodynamics of phase change materials and may find a number of interesting applications in polymer processing and thermal storage. The experimental findings are complemented by the analysis of a simple numerical model which provides further insights into the physical origins and mechanism of the instability.
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Dates et versions

hal-03291970 , version 1 (20-07-2021)

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Rawad Himo, Cathy Castelain, Teodor Burghelea. Chaos in a melting pot. Journal of Fluid Mechanics, 2021, 918, pp.A47. ⟨10.1017/jfm.2021.367⟩. ⟨hal-03291970⟩
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