Article Dans Une Revue Journal of Non-Equilibrium Thermodynamics Année : 2022

Thermal Shear Waves Induced in Mesoscopic Liquids at Low Frequency Mechanical Deformation

Eni Kume
  • Fonction : Auteur

Résumé

Abstract We show that a confined viscous liquid emits a dynamic thermal response upon applying a low frequency (∼1 Hz) shear excitation. Hot and cold thermal waves are observed in situ at atmospheric pressure and room temperature, in a viscous liquid (polypropylene glycol) at various thicknesses ranging from 100 µm up to 340 µm, upon applying a mechanical oscillatory shear strain. The observed thermal effects, synchronous with the mechanical excitation, are inconsistent with a viscous behaviour. It indicates that mesoscopic liquids are able to (partly) convert mechanical shear energy in non-equilibrium thermodynamic states. This effect called thermo-elasticity is well known in solid materials. The observation of a thermal coupling to the mechanical shear deformation reinforces the assumption of elastically correlated liquid molecules. The amplitude of the thermo-elastic waves increases linearly by increasing the shear strain amplitude up to a transition to a non-linear thermal behavior, similar to a transition from an elastic to plastic regime. The thermo-elastic effects do not give rise to any change in stress measurements and thus the dynamic thermal analysis provides unique information about dynamic liquid properties.

Dates et versions

hal-04788118 , version 1 (18-11-2024)

Identifiants

Citer

Eni Kume, Laurence Noirez. Thermal Shear Waves Induced in Mesoscopic Liquids at Low Frequency Mechanical Deformation. Journal of Non-Equilibrium Thermodynamics, 2022, 47 (2), pp.155-163. ⟨10.1515/jnet-2021-0091⟩. ⟨hal-04788118⟩
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