Arrêt de service programmé du vendredi 10 juin 16h jusqu’au lundi 13 juin 9h. Pour en savoir plus
Accéder directement au contenu Accéder directement à la navigation
Article dans une revue

Vorticity and convective heat transfer downstream of a vortex generator

Abstract : Vorticity generation has been identified, since the 80's, as an efficient means for enhancing heat transfer; the mean radial velocity component due to the induced flow pattern contributes to the heat removal. In the present work, momentum and heat transfer are studied in a test section designed to mimic the industrial HEV (High-Efficiency Vorticity) mixer. It consists of a basic configuration with a unique vorticity generator inserted on the bottom wall of a heated straight channel. The aim of this work is to analyze to which extend the convective heat transfer is correlated to the vorticity, as it is presumed to cause the intensification. In this case, the driving vorticity is the streamwise vorticity flux , and the heat transfer is characterized by the Nusselt number Nu, both quantities being spanwise averaged. The study is mainly numerical; we have used the previous PIV measurements and DNS data from the open literature to validate the numerical simulations. It is shown that there exists a strong correlation between the vorticity flux and Nusselt number close to the vortex generator. However, the axial variation diverges for these quantities when moving downstream. The Nusselt number presents a sharp peak over the VG and decreases nearly to its basic level just behind the VG, while the vortex persists far downstream from the tab and relaxes very slowly. Heat transfer intensification at the Nusselt peak is about 100%, and reduces to about 6% downstream of the VG, the intensity of the vorticity momentum being decreased only to about 50% of its peak value at the test section outlet.
Type de document :
Article dans une revue
Liste complète des métadonnées

Littérature citée [53 références]  Voir  Masquer  Télécharger
Contributeur : Okina Univ Angers Connectez-vous pour contacter le contributeur
Soumis le : mercredi 1 avril 2020 - 15:11:32
Dernière modification le : lundi 4 avril 2022 - 15:54:04


Accord explicite pour ce dépôt



Thierry Lemenand, Charbel Habchi, Dominique Della Valle, Hassan Peerhossaini. Vorticity and convective heat transfer downstream of a vortex generator. International Journal of Thermal Sciences, Elsevier, 2018, 125, pp.342-349. ⟨10.1016/j.ijthermalsci.2017.11.021⟩. ⟨hal-02527890⟩



Consultations de la notice


Téléchargements de fichiers