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Transfert de chaleur et comportement d'écoulement d'un coulis de matériau à changement de phase micro-encapsulé en écoulement turbulent, intéressant sur le plan économique.

Heat transfer and fluid flow behavior of an economical microencapsulated phase change material slurry in turbulent flow.

Numéro : pap. O46

Auteurs : ALVARADO J. L., TAHERIAN H., LANGURI E. M., et al.

Résumé

A microencapsulated phase change material (MPCM) slurry has been formulated as a high heat capacity heat transfer fluid (HTF) for turbulent flow conditions. The MPCM slurry consists of du-rable 5-µm microcapsules. The phase change material inside the microcapsules consists of methyl stearate. Heat transfer and fluid flow properties of the aqueous MPCM slurry in turbulent flow (3000 < Re < 6000) were determined experimentally. Heat transfer data were obtained under constant heat flux conditions using a closed heat transfer loop. The experimental system was used to determine effective heat transfer coefficient and pressure drop with and without phase change occurring inside the microcapsules. Dynamic viscosity data suggest that at relatively low mass concentrations the slurry behaves as a Newtonian fluid. The pressure drop data under turbulent flow conditions were also measured at MPCM concentrations of 7 and 11% by weight. It was found that whenever the MPCM experienced a phase change, the heat transfer coefficient of the MPCM slurry was very close to that of water. Moreover, the pressure drop of the MPCM slurry was comparable to that of water despite of the higher viscosity the slurry. A non-dimensional Nusselt number correlation is being proposed for MPCM slurries.

Documents disponibles

Format PDF

Pages : 8 p.

Disponible

  • Prix public

    20 €

  • Prix membre*

    Gratuit

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

Détails

  • Titre original : Heat transfer and fluid flow behavior of an economical microencapsulated phase change material slurry in turbulent flow.
  • Identifiant de la fiche : 30005049
  • Langues : Anglais
  • Source : 10th International Conference on Phase-Change Materials and Slurries for Refrigeration and Air Conditioning. Proceedings: Kobe, Japan, July 29-August 1, 2012.
  • Date d'édition : 01/07/2012

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