Régimes d'écoulement diphasique lors de de la condensation de R-134a à faible flux massique dans des microcanaux rectangulaires

Translated title of the contribution: Two-phase flow regimes of condensing R-134a at low mass flux in rectangular microchannels

Michael A. Vanderputten, Tabeel A. Jacob, Maria Sattar, Nouman Ali, Brian M. Fronk

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

Abstract

Qualitative two-phase flow regime data are obtained from high-speed visualization of condensing flows of R-134a at mass fluxes from 75 to 150 kg m−2s−1 and quality from 0.1 to 0.8 in square microchannels (DH = 0.84 mm) cooled from a single side. Superheated R-134a is distributed into multiple parallel microchannels and then partially condensed, using a counterflow water loop, to the desired quality prior to the inlet of a visualization section. This experimental arrangement mitigates the potential for flow maldistribution. Despite very small heat duties, a low uncertainty in the quality in the visualization section is maintained by enforcing a large temperature difference on the water-side (ΔT > 10 K). For all conditions, annular or annular/wavy type flow were observed, with no distinct intermittent flow. Data are compared with flow macro and mini/microchannel maps, which are shown to over predict the occurrence of intermittent or wavy flow.

Translated title of the contributionTwo-phase flow regimes of condensing R-134a at low mass flux in rectangular microchannels
Original languageFrench
Pages (from-to)92-103
Number of pages12
JournalInternational Journal of Refrigeration
Volume84
DOIs
StatePublished - Dec 2017

All Science Journal Classification (ASJC) codes

  • Building and Construction
  • Mechanical Engineering

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