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Flow Maps and Flow Patterns of R1233zd(E) in a Circular Minichannel at Low, Medium and High Values of Saturation Pressure
Abstract
There is a gap in knowledge regarding the flow pattern of low-boiling working fluids in the range of high saturation temperatures (above 120°C) and medium and high reduced pressures (0.5-0.9). Data are present in the literature for similar values of reduced pressures, but for lower values of saturation temperature. This is due to the existing refrigeration applications of these working fluids. At high values of reduced pressure, the density of the gas phase is relatively high, and the density of the liquid phase is low. There is a low specific volume difference between the liquid and gas phases. The liquid phase has a low surface tension value. The gas phase has a relatively high viscosity, and the liquid phase has a reduced value of viscosity. These changes in the parameters of refrigerants cause significant differences in flow structures. At a low value of reduced pressure, 0.2, the occurrence of annular flow was observed already at a quality of 0.07 for a mass velocity of G=355 [kg/(m^2·s)], while for a reduced pressure of 0.8, annular flow occurs much later, at a quality of 0.47 for the same mass velocity. Mass velocity flow maps in a function of quality for constant values of reduced pressure and flow maps for reduced pressure as a function of quality at constant mass velocity are presented. Flow maps are compared with correlations for transition lines between intermittent and annular flow structures from literature. Authors new correlation for transition line for researched conditions is presented. New prediction method is the only one which managed to predict transition to annular flow at high values of reduced pressure for collected experimental data.
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- Accepted or Published Version
- DOI:
- Digital Object Identifier (open in new tab) 10.52202/069564-0037
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- Category:
- Conference activity
- Type:
- publikacja w wydawnictwie zbiorowym recenzowanym (także w materiałach konferencyjnych)
- Language:
- English
- Publication year:
- 2023
- Bibliographic description:
- Głuch S., Pysz M., Mikielewicz D.: Flow Maps and Flow Patterns of R1233zd(E) in a Circular Minichannel at Low, Medium and High Values of Saturation Pressure// / : , 2023,
- DOI:
- Digital Object Identifier (open in new tab) 10.52202/069564-0037
- Sources of funding:
- Verified by:
- Gdańsk University of Technology
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