Semi-empirical model of two-phase flow of refrigerant-134a through short tube orifices

Yong Chan Kim, Dennis L. O'Neal

Research output: Contribution to journalArticle

23 Citations (Scopus)


Measurements were performed on Refrigerant-134a flowing through short tube orifices with length-to-diameter ratios ranging from 5 to 20. Both two-phase and subcooled liquid flow conditions entering the short tube were investigated for upstream pressures ranging from 896 to 1448 kPa and for qualities as high as 10% and subcoolings as high as 13.9°C. Data were studied as a function of the chief operating variables and tube geometry. Semi-empirical models for both single- and two-phase flow at the inlet of the short tubes were developed to predict the mass flow of Refrigerant-134a through short tube orifices. It was determined that for sharp-edged short tubes with single- and two-phase flow, about 95% of the measured data and model's prediction were within ± 5% of each other.

Original languageEnglish
Pages (from-to)426-435
Number of pages10
JournalExperimental Thermal and Fluid Science
Issue number4
Publication statusPublished - 1994 Nov 1
Externally publishedYes


ASJC Scopus subject areas

  • Fluid Flow and Transfer Processes
  • Mechanical Engineering
  • Engineering(all)

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