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Two-phase flow regimes of condensing R-134a at low mass flux in rectangular microchannels.

Author(s) : VANDERPUTTEN M. A., JACOB T. A., SATTAR M., et al.

Type of article: Article, IJR article

Summary

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-2?s-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 (?T?>?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.

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Pages: 92-103

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Details

  • Original title: Two-phase flow regimes of condensing R-134a at low mass flux in rectangular microchannels.
  • Record ID : 30022523
  • Languages: English
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 84
  • Publication date: 2017/12
  • DOI: http://dx.doi.org/10.1016/j.ijrefrig.2017.08.021

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