Faster Diffusion across an Irregular Boundary

Abstract : We investigate how the shape of a heat source may enhance global heat transfer at short time. An experiment is described that allows us to obtain a direct visualization of heat propagation from a prefractal radiator. We show, both experimentally and numerically, that irregularly shaped passive coolers rapidly dissipate at short times, but their efficiency decreases with time. The de Gennes scaling argument is shown to be only a large scale approximation, which is not sufficient to describe adequately the temperature distribution close to the irregular frontier. This work shows that radiators with irregular surfaces permit increased cooling of pulsed heat sources.
Type de document :
Article dans une revue
Physical Review Letters, American Physical Society, 2012, 108, pp.240602. 〈10.1103/PhysRevLett.108.240602〉
Liste complète des métadonnées

Littérature citée [1 références]  Voir  Masquer  Télécharger

https://hal-ecp.archives-ouvertes.fr/hal-00760296
Contributeur : Anna Rozanova-Pierrat <>
Soumis le : mercredi 5 décembre 2012 - 18:56:40
Dernière modification le : jeudi 10 mai 2018 - 02:00:50
Document(s) archivé(s) le : mercredi 6 mars 2013 - 02:55:10

Fichiers

Rozanova.pdf
Fichiers éditeurs autorisés sur une archive ouverte

Identifiants

Citation

Anna Rozanova-Pierrat, Denis Grebenkov, Bernard Sapoval. Faster Diffusion across an Irregular Boundary. Physical Review Letters, American Physical Society, 2012, 108, pp.240602. 〈10.1103/PhysRevLett.108.240602〉. 〈hal-00760296〉

Partager

Métriques

Consultations de la notice

334

Téléchargements de fichiers

277