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Amélioration du transfert de chaleur de l'ébullition libre dans l'eau et des mélanges d'éthanol et d'eau avec des agents tensioactifs.

Enhancement of pool boiling heat transfer in water and ethanol/water mixtures with surface-active agent.

Auteurs : INOUE T., TERUYA Y., MONDE M.

Type d'article : Article

Résumé

In order to gain basic data related to enhancement of the heat transfer coefficient in water and the mixtures, the surface tension of ethanol/water mixtures was measured over the whole ethanol fraction range and the effect of the surface-active agent on surface tension was also measured in the mixtures. The boiling heat transfer coefficient, the onset of boiling and the critical heat flux in water and ethanol/water mixtures, with and without the surface-active agent, were measured on a horizontal fine heated wire at a pressure of 0.1 MPa. The experiment was carried out in the whole range of the ethanol fraction and in a surfactant concentration of 0-5000 ppm. The experiment showed that the coefficients were enhanced in a lower ethanol fraction and in low heat flux which is slightly higher than heat flux at the onset of boiling. It was also found that the enhancement due to the surfactant disappears over 1000 ppm. Finally, the authors clarify that depression of the surface tension by the surfactant remarkably enhances the heat transfer coefficients in the nucleate pool boiling.

Détails

  • Titre original : Enhancement of pool boiling heat transfer in water and ethanol/water mixtures with surface-active agent.
  • Identifiant de la fiche : 2005-1151
  • Langues : Anglais
  • Source : International Journal of Heat and Mass Transfer - vol. 47 - n. 25
  • Date d'édition : 12/2004

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