Two-phase pressure drop of refrigerants during flow boiling in small channels: an experimental investigation and correlation development

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...

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Veröffentlicht in:International journal of multiphase flow 2000-11, Vol.26 (11), p.1739-1754
Hauptverfasser: Tran, T.N, Chyu, M.-C, Wambsganss, M.W, France, D.M
Format: Artikel
Sprache:eng
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Zusammenfassung: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 × 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%.
ISSN:0301-9322
1879-3533
DOI:10.1016/S0301-9322(99)00119-6