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Analyse des phénomènes de transfert de chaleur pendant la production de coulis de glace dans des échangeurs de chaleur à plaques à surface raclée.

Analysis of heat transfer phenomena during ice slurry production in scraped surface plate heat exchangers.

Auteurs : MARTINEZ D. S., SOLANO J. P., ILLÁN F., et al.

Type d'article : Article, Article de la RIF

Résumé

Heat transfer during ice slurry production in a scraped surface plate heat exchanger (SSPHE) has been experimentally investigated. By using a 7 wt. % sodium chloride brine, a wide range of operating conditions has been tested: scraping velocities from 0.1 to 0.8 s-1 and logarithmic temperature differences from 0.5 to 2.5 K. Two different PEEK scraper arrangements have been used, mounted on the driving arms: rigid scrapers and surface adaptable scrapers, pushed by torsion springs. Heat transfer coefficients and ice production rate were measured under batch operating mode. Experimental results shown dependence of the nucleation onset with the scraping speed and the wall supercooling degree. Global nucleation only occurred for high velocities and low supercooling degrees, appearing only on the wall for the other cases. A decrease of the heat transfer coefficient of 1.5 times for increasing logarithmic temperature differences is reported, as a consequence of the ice layer growth with a low effect of the scraping speed. The use of adaptable scrapers provide heat transfer coefficient augmentations from 2 to 4-fold with respect to the rigid configuration.

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Format PDF

Pages : 221-232

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Détails

  • Titre original : Analysis of heat transfer phenomena during ice slurry production in scraped surface plate heat exchangers.
  • Identifiant de la fiche : 30012864
  • Langues : Anglais
  • Source : International Journal of Refrigeration - Revue Internationale du Froid - vol. 48
  • Date d'édition : 12/2014

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