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.
|Number of pages||10|
|Journal||Experimental Thermal and Fluid Science|
|Publication status||Published - 1994 Nov 1|
ASJC Scopus subject areas
- Fluid Flow and Transfer Processes
- Mechanical Engineering