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Document IIF

Étude expérimentale de l'ébullition libre d'eau à très faible pression sur une surface chauffée horizontale ou verticale.

Experimental study of water pool boiling at very low pressure on a vertical or horizontal heated surface.

Numéro : pap. n. TP-035

Auteurs : GIRAUD F., RULLIERE R., TOUBLANC C., et al.

Résumé

The objective of this study is to describe properly the boiling heat transfer phenomena at very low pressure, a fundamental knowledge acquired to optimize the design of evaporators in absorption or adsorption systems using water as the refrigerant (H2O-LiBr absorption or, silicagel/H2O, zeolite/H2O adsorption systems). We will first describe the experimental set up which permits the characterization of water pool boiling at pressure below 1.8 kPa. Then, results obtained on a vertical or horizontal flat copper surface of 19.6 cm² will be presented. We will show boiling curves at decreasing flux in order to study influences of the liquid height and of the wall orientation. The static head imposed by the water level has a major influence on the absolute pressure. It could be of the same order of magnitude as the fluid saturation pressure. That is why the dynamics of bubbles in such an inhomogeneous environment was also studied. Bubbles with particular shape and with a diameter up to 10 cm were observed.

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Format PDF

Pages : 266-273

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Détails

  • Titre original : Experimental study of water pool boiling at very low pressure on a vertical or horizontal heated surface.
  • Identifiant de la fiche : 30008110
  • Langues : Anglais
  • Source : 4th IIR Conference on Thermophysical Properties and Transfer Processes of Refrigerants
  • Date d'édition : 17/06/2013

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