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Coefficients de transfert de chaleur des échangeurs de chaleur utilisés dans les refroidisseurs thermoacoustiques.

Heat transfer coefficients of heat exchangers in thermoacoustic coolers.

Auteurs : PAEK I., BRAUN J. E., MONGEAU L.

Résumé

The performance of a thermoacoustic cooler is very sensitive to heat exchanger design and performance. The volume available for heat exchange is limited since convective heat transfer between the heat exchangers and a stack is a result of oscillating particles and the particle displacements are only a few millimetres. It is necessary to estimate heat transfer coefficients between the heat exchangers and stack ends in order to predict the overall cooler performance. In the paper, the gas-side heat transfer for heat exchangers installed within a one-half wavelength standing wave thermoacoustic cooler was investigated. Dimensionless heat transfer coefficients, Colburn-j factors, were determined from the measurements and compared with different models from the literature. A new method was presented for calculation of heat transfer coefficients for oscillating flows using steady-flow heat transfer correlations.

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Détails

  • Titre original : Heat transfer coefficients of heat exchangers in thermoacoustic coolers.
  • Identifiant de la fiche : 2004-1183
  • Langues : Anglais
  • Source : 21st IIR International Congress of Refrigeration: Serving the Needs of Mankind.
  • Date d'édition : 17/08/2003

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