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Caractéristiques du transfert de chaleur par convection des nanofluides fondés sur des frigoporteurs à l'intérieur de nanotubes en carbone dans un échangeur de chaleur tubulaire.

Convective heat transfer characteristics of secondary refrigerant based CNT nanofluids in a tubular heat exchanger.

Auteurs : KUMARESAN V., VELRAJ R., DAS S. K.

Type d'article : Article, Article de la RIF

Résumé

This paper reports an experimental study on the convective heat transfer characteristics of a secondary refrigerant based CNT nanofluids in a tubular heat exchanger. The nanofluid is prepared by dispersing the multiwalled carbon nanotubes (MWCNT) in the water–ethylene glycol mixture (70:30 by volume). The results show that the convective heat transfer coefficient is enhanced to a maximum of ~160% for the nanofluid containing 0.45 vol. % MWCNT, which could not be attributed solely by enhanced thermal conductivity of the nanofluids. Particle rearrangement, the very high aspect ratio and delaying the boundary layer development due the random movement of the carbon nanotubes are the possible mechanisms. Further, there is an appreciable decrease in Reynolds number for a given velocity for all the nanofluids. The enhancement in the friction factor is negligible at higher velocity and higher temperature for the nanofluids with 0.15 vol. % MWCNT.

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Pages : 2287-2296

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    20 €

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    Gratuit

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Détails

  • Titre original : Convective heat transfer characteristics of secondary refrigerant based CNT nanofluids in a tubular heat exchanger.
  • Identifiant de la fiche : 30005980
  • Langues : Anglais
  • Source : International Journal of Refrigeration - Revue Internationale du Froid - vol. 35 - n. 8
  • Date d'édition : 12/2012

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