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Amélioration des caractéristiques de l’ébullition libre par adjonction de nano oxyde d’aluminium à du R-141b sur un élément chauffant circulaire horizontal en acier.

Enhancement of pool boiling characteristics by an addition of nano Aluminum oxide to R-141b over a rough horizontal steel circular heater.

Auteurs : EID E. I., KHALAF-ALLAH R. A., TOLAN M.

Type d'article : Article, Article de la RIF

Résumé

In this paper, an experimental investigation of the effect of addition of Aluminum oxide nano particles Al2O3, to refrigerant, R-141b, on nucleate pool boiling heat transfer characteristics was carried out. The experiments were done over a flat steel horizontal circular heating surface, with different roughness, different nano particles concentration, different heat flux, and different normalized pressure. The roughness was varied at 0.14, 1.35, and 2.87?µm, the concentrations were 0.001, 0.005, 0.01, 0.03, 0.05 and 0.1% by Vol., The applied heat flux was varied up to 150 kW/m2 and the operating normalized pressure was varied at 0.01, 0.125, and 0.3. The results show that; the heat transfer coefficient increases with the concentration up to 0.05%. However, at high concentration up to 0.1%, the heat transfer coefficient decreases due to the accumulation of deposits of nanoparticles above the heating surface. The enhancement in heat transfer coefficient ranged from 24% to 60% for the normalized pressure from 0.01 to 0.3 at the same heat flux and concentration. At a heat flux of 150?kW/m2, 0.3 normalized pressure and a roughness of 2.87?µm, and a concentration of 0.05%, the enhancement reaches to 124%. An empirical correlation was deduced to formulate the relation among heat transfer coefficient, heat flux, pressure, concentration, and roughness within a maximum deviation of about ±9%.

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Format PDF

Pages : 311-322

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Détails

  • Titre original : Enhancement of pool boiling characteristics by an addition of nano Aluminum oxide to R-141b over a rough horizontal steel circular heater.
  • Identifiant de la fiche : 30025393
  • Langues : Anglais
  • Source : International Journal of Refrigeration - Revue Internationale du Froid - vol. 98
  • Date d'édition : 02/2019
  • DOI : http://dx.doi.org/10.1016/j.ijrefrig.2018.11.006

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