Oscillatory Rayleigh–Bénard Convection in elasto-viscoplastic gels - LEMTA - Laboratoire d'Energétique et de Mécanique Théorique et Appliquée Accéder directement au contenu
Article Dans Une Revue Journal of Non-Newtonian Fluid Mechanics Année : 2020

Oscillatory Rayleigh–Bénard Convection in elasto-viscoplastic gels

Résumé

Rayleigh-Bénard convection (RBC) is studied in an elasto-viscoplastic (EVP) gel, the widely used and studied Carbopol gel. The transition from conductive to convective regime is determined by the Schmidt-Milverton principle which leads to a critical value of the inverse of the Yield number 1∕. However, an oscillatory motion in the gel is observed below 1∕ ≈ 60 when smooth and untreated walls are used. Particles within the gel describe periodical loops close to their initial positions for 16.5 < 1∕ < 25. For larger values of 1∕ ≈ 50 < 1∕ , loops are still obtained but particles move away progressively from their initial position. The oscillations take the form of periodic traveling waves (TW). We demonstrate that elastic effects play the major role in the occurrence of oscillations.
Fichier principal
Vignette du fichier
article_JNNFM_final20200602.pdf (18.09 Mo) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)
Loading...

Dates et versions

hal-02986087 , version 1 (02-11-2020)

Identifiants

Citer

Christel Metivier, Frédéric Brochard, Mohamed Darbouli, Albert Magnin. Oscillatory Rayleigh–Bénard Convection in elasto-viscoplastic gels. Journal of Non-Newtonian Fluid Mechanics, 2020, 286, ⟨10.1016/j.jnnfm.2020.104428⟩. ⟨hal-02986087⟩
104 Consultations
28 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More