Partager

Modification de la mouillabilité par l’ébullition libre de nanofluides et effets sur le transfert de chaleur.

Wettability change by pool boiling of nanofluids and its impact on heat transfer.

Numéro : pap. 2129

Auteurs : ZHANG F., JACOBI A. M.

Résumé

In refrigeration and air-conditioning systems, evaporator performance can be enhanced by avoiding dry-out of the tube wall. There are a myriad of other multiphase systems that can benefit from enhanced surface wetting. Using nanofluid boiling nanoparticle deposition (NBND), surface wettability can be enhanced significantly due to the formation of a porous layer that modifies liquid spreading. This paper will present an investigation of surfaces modified by nanofluid boiling using various types of aqueous aluminum oxide nanofluids nanofluids. Scanning Electronic Microscopy (SEM) images show the growth of aluminum oxide hydroxide on the aluminum substrate, which enhances affinity with water, and the micro-structures introduced by nanoparticle deposition. Atomic Force Microscopy (AFM) reveals the physics of the wettability enhancement by NBND on ultra-smooth substrates, which is described by Wenzel’s wetting model. The impact of this change in wettability on boiling heat transfer will also be discussed with data from pool boiling experiment. These results will guide the design of nanoporous superhydrophilic coatings to enhance heat transfer from a surface science point of view.

Documents disponibles

Format PDF

Pages : 8

Disponible

  • Prix public

    20 €

  • Prix membre*

    15 €

* meilleur tarif applicable selon le type d'adhésion (voir le détail des avantages des adhésions individuelles et collectives)

Détails

  • Titre original : Wettability change by pool boiling of nanofluids and its impact on heat transfer.
  • Identifiant de la fiche : 30018848
  • Langues : Anglais
  • Source : 2016 Purdue Conferences. 16th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Date d'édition : 11/07/2016

Liens


Voir d'autres communications du même compte rendu (274)
Voir le compte rendu de la conférence

Indexation