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Prévision des gradients de pression des frigorigènes en écoulement diphasique dans des tubes horizontaux.

Prediction of two-phase pressure gradients of refrigerants in horizontal tubes.

Auteurs : OULD DIDI M. B., KATTAN N., THOME J. R.

Type d'article : Article, Article de la RIF

Résumé

Two-phase pressure drop data were obtained for evaporation in two horizontal test sections of 10.92 and 12.00 mm diameter for five refrigerants (R134a, R123, R402A, R404A and R502) over mass velocities from 100 to 500 kg/m2/s and vapour qualities from 0.04 to 1.0. These data have then been compared against seven two-phase frictional pressure drop prediction methods. Overall, the method by Müller-Steinhagen and Heck (Müller-Steinhagen H, Heck K: a simple friction pressure drop correlation for two-phase flow in pipes. Chem. Eng. Process 1986; 20:297-308) and that by Grönnerud (Grönnerud R: investigation of liquid hold-up, flow resistance and heat transfer in circulation type evaporators, part IV: two-phase flow resistance in boiling refrigerants. Annexe 1972-1, Bull. Inst. Froid, 1979) were found to provide the most accurate predictions while the widely quoted method of Friedel (Friedel L: improved friction drop correlations for horizontal and vertical two-phase pipe flow. European Two-phase Flow Group Meeting, paper E2; June 1979; Ispra, Italy) gave the third best results.

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Pages : 935-947

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Détails

  • Titre original : Prediction of two-phase pressure gradients of refrigerants in horizontal tubes.
  • Identifiant de la fiche : 2003-0622
  • Langues : Anglais
  • Source : International Journal of Refrigeration - Revue Internationale du Froid - vol. 25 - n. 7
  • Date d'édition : 11/2002

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