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Chute de pression et taux de vide de l’écoulement diphasique adiabatique vertical et horizontal dans un échangeur de chaleur à plaques à canal unique avec distribution gaz-liquide uniforme.

Pressure drop and void fraction of vertical and horizontal adiabatic two-phase flow in a plate heat exchanger single channel with uniform gas-liquid distribution.

Numéro : pap. n. 468

Auteurs : BUSCHER S.

Résumé

The pressure drop of air-water two-phase flow is studied in a cross-corrugated channel for varying flow directions. Two-phase frictional pressure drop can only be measured for horizontal flow, neglecting acceleration pressure drop. In vertical flow, a void-fraction model is necessary to calculate the pressure drop from a measured pressure difference. A plate heat exchanger single channel is pivot-mounted to allow horizontal, vertical upward and downward flow. Uniform gas-liquid distribution is obtained injecting both air and water separately into the channel through a number of nozzles. The experimental dissipation rates of vertical and horizontal two-phase flow are compared to single-phase flow. Thus, homogeneous flow is distinguished from the occurrence of slip caused by buoyancy or annular flow. The validity of the homogenous model is empirically confirmed for volumetric gas flow ratios up to 0.7 and centrifugal Froude numbers above 2 - if a uniform twophase distribution is achieved. A correlation of the single-phase friction factor is given and found to also be valid for homogeneous flow.

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Pages : 9

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Détails

  • Titre original : Pressure drop and void fraction of vertical and horizontal adiabatic two-phase flow in a plate heat exchanger single channel with uniform gas-liquid distribution.
  • Identifiant de la fiche : 30025997
  • Langues : Anglais
  • Source : Proceedings of the 25th IIR International Congress of Refrigeration: Montréal , Canada, August 24-30, 2019.
  • Date d'édition : 24/08/2019
  • DOI : http://dx.doi.org/10.18462/iir.icr.2019.0468

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