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Chaos in a melting pot

Published online by Cambridge University Press:  19 May 2021

Rawad Himo Open the ORCID record for Rawad Himo [Opens in a new window] ,
Cathy Castelain Open the ORCID record for Cathy Castelain [Opens in a new window]  and
Teodor Burghelea Open the ORCID record for Teodor Burghelea [Opens in a new window]
Rawad Himo
Affiliation:
Université de Nantes, CNRS, Laboratoire de Thermique et Énergie de Nantes, LTeN, UMR 6607, F-44000Nantes, France
Cathy Castelain
Affiliation:
Université de Nantes, CNRS, Laboratoire de Thermique et Énergie de Nantes, LTeN, UMR 6607, F-44000Nantes, France
Teodor Burghelea*
Affiliation:
Université de Nantes, CNRS, Laboratoire de Thermique et Énergie de Nantes, LTeN, UMR 6607, F-44000Nantes, France
*
†Email address for correspondence: [email protected]
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Abstract

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.

JFM classification

Instability: Instability Non-Newtonian Flows: Rheology Phase change: Phase change
Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 918 , 10 July 2021 , A47
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Copyright
© The Author(s), 2021. Published by Cambridge University Press

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References

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