Abstract
Two-phase flow pressure drop measurements were made during a phase-change heat transfer process with three refrigerants (R-134a, R-12, and R-113) at six different pressures ranging from 138 to 856 kPa, and in two sizes of round tubes (2.46 and 2.92 mm inside diameters) and one rectangular channel (4.06 x 1.7 mm). The data were compared with those from large tubes under similar conditions, and state-of-the-art correlations were evaluated using the R-134a data. The state-of-the-art large-tube correlations failed to satisfactorily predict the experimental data. The data were used to develop a new correlation for two-phase pressure drop during flow boiling in small channels. The correlation was then tested against the experimental data for the three refrigerants; the error was ±20%. (C) 2000 Elsevier Science Ltd. All rights reserved.
Original language | English |
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Pages (from-to) | 1739-1754 |
Number of pages | 16 |
Journal | International Journal of Multiphase Flow |
Volume | 26 |
Issue number | 11 |
DOIs | |
State | Published - Nov 2000 |
Keywords
- Correlations
- Refrigerants
- Small channels
- Two-phase pressure drop