Pressure drop and visualization of R-134a two-phase flow in a rectangular microchannel

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Adiabatic two-phase flow of R-134a has been characterized in a rectangular channel with a hydraulic diameter 0.168 mm and the aspect ratio 0.1. Two-phase flow pressure drop and flow visualization were performed in the range of mass flux from 279 to 461 kg m-2 s-1 and vapor quality from 0.05 to 0.95. The measured pressure drops were compared with twelve existing correlations. The results showed that most of the correlations overpredict the experimental data. The flow visualization demonstrated that the flow patterns in the microchannel are similar to those in minichannels. The slug/plug flow and annular flow are the predominant flow regimes, and the bubble flow only occurs when quality is very low.

Original languageEnglish (US)
Pages (from-to)703-710
Number of pages8
JournalASHRAE Transactions
Volume109 PART 1
StatePublished - Jul 24 2003
EventTechnical and Symposium Papers Presented At the 2003 Winter Meeting of The ASHRAE - Chicago, IL, United States
Duration: Jan 26 2003Jan 29 2003

ASJC Scopus subject areas

  • Building and Construction
  • Mechanical Engineering


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