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Two-phase flow regimes of refrigerant R134a in an oscillating horizontal rectangular minichannel conduit.

Author(s) : ENOKI K., ONO M., OKAWA T., AKISAWA A., MORI H., KRISTIAWAN B., WIJAYANTA A. T.

Type of article: IJR article

Summary

In this study, refrigerant R134a experiments were carried out to observe two-phase flow in an oscillating horizontal rectangular minichannel conduit at refrigerant mass flux of approximately 30 kg•m − 2•s − 1 to 300 kg•m − 2•s − 1, saturation temperature of approximately 30 °C, and average vapor quality in the test section inlet of approximately 0.05 to 0.9. The test section was made from quartz and consists of a visible rectangular minichannel with a hydraulic diameter of 0.84 mm. The test section was oscillated vertically using a reciprocating motor. The effects of oscillation on slug and stratified flow patterns were investigated. The experimental observation was compared with an existing flow pattern map. The thin liquid film around the vapor of slug flow mostly moved up and down when the test section oscillated. As a result, a dry surface was not observed around the vapor due to the lower heat transfer coefficient. When the test section oscillated, the stratified flow changed to annular flow, and a dry surface was also not observed on the upper side of the minichannel conduit.

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Pages: 261-268

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Details

  • Original title: Two-phase flow regimes of refrigerant R134a in an oscillating horizontal rectangular minichannel conduit.
  • Record ID : 30027716
  • Languages: English
  • Subject: Technology
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 118
  • Publication date: 2020/10
  • DOI: http://dx.doi.org/10.1016/j.ijrefrig.2020.06.002
  • Available in the IIR library

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