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Chute de pression dans les collecteurs cylindriques de forme arrondie d'échangeurs de chaleur à microcanaux à écoulement parallèle : coefficients de chute de pression pour un écoulement monophasique.

Pressure drop in round cylindrical headers of parallel flow MCHXs: Pressure loss coefficients for single phase flow.

Auteurs : REN T., HRNJAK P.

Type d'article : Article, Article de la RIF

Résumé

This paper presents the investigation of the pressure drop in headers and development of correlation for pressure loss coefficient for single phase flow through round cylindrical headers of parallel MCHXs. The working fluid was compressed air flowing through header with 1–20 m s-1 based on smallest cross section while the velocity through microchannels was in the range 6–30 m s-1. The experimental results indicate that the pressure loss coefficient of inlet header is a linear function of the ratio of velocities through microchannel tube and header, except for the first two microchannel tubes; the pressure loss coefficient of outlet header is a quadratic function of the ratio of velocities through microchannel tube and header, and decreases as the velocities through upstream microchannel tubes increase. Correlations for predicting pressure drop of inlet header and outlet header are developed and agreement for 98% of experimental data is within a ±15 Pa.

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Pages : 119-134

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Détails

  • Titre original : Pressure drop in round cylindrical headers of parallel flow MCHXs: Pressure loss coefficients for single phase flow.
  • Identifiant de la fiche : 30012904
  • Langues : Anglais
  • Source : International Journal of Refrigeration - Revue Internationale du Froid - vol. 49
  • Date d'édition : 01/2015

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