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Corrélation de chute de pression transitoire entre des minicanaux parallèles pendant l'écoulement en ébullition de R134a.

Transient pressure drop correlation between parallel minichannels during flow boiling of R134a.

Numéro : pap. 2171

Auteurs : KHOVALYG D., HRNJAK P. S., JACOBI A. M.

Résumé

There is significant interest in the boiling performance of refrigerants in mini- and microchannels, especially in flow geometries relevant to compact heat exchangers for air-conditioning and refrigeration applications. Pressure drop (?P) characteristics during flow boiling of refrigerant R134a have been studied extensively over the past decade; however, in most research ?P is measured over a single channel or multiple parallel channels (manifold to manifold). There has been no work examining the individual pressure drop in each channel in multiple channel design. Moreover, correlations or relationships between the instantaneous ?P in individual minichannels operating in parallel have not been reported. In this work, an investigation of the effect of heat flux, mass flux and inlet vapor qualities on the flow patterns and pressure drop for flow boiling of R134a in 0.54 mm square parallel minichannels is reported. In particular, flow boiling experiments are conducted at flow rates between 0.1 and 0.51 g/s and heat fluxes from 0 to 36 kW/m2. The heat flux input among a set of four horizontal, parallel minichannels is individually varied and controlled in each test. The focus of the work is on the investigation of correlations between flow boiling of R134a in parallel minichannels based on flow visualization and pressure drop measurements in each channel independently.

Documents disponibles

Format PDF

Pages : 10 p.

Disponible

  • Prix public

    20 €

  • Prix membre*

    15 €

* meilleur tarif applicable selon le type d'adhésion (voir le détail des avantages des adhésions individuelles et collectives)

Détails

  • Titre original : Transient pressure drop correlation between parallel minichannels during flow boiling of R134a.
  • Identifiant de la fiche : 30012977
  • Langues : Anglais
  • Source : 2014 Purdue Conferences. 15th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Date d'édition : 14/07/2014

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