期刊
EXPERIMENTAL THERMAL AND FLUID SCIENCE
卷 25, 期 3-4, 页码 131-139出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/S0894-1777(01)00066-8
关键词
two-phase; pressure drop; correlation; refrigerant; micro-channel
Single-phase and adiabatic two-phase flow pressure drop were measured for R-134A, R-22 and R-404A flowing in a multi-port extruded aluminum tube with hydraulic diameter of 2.13 mm, and in two copper tubes having inside diameters of 6.25 and 3.25 mm, respectively. The single-phase friction factor was predicted within +/-10% using the Blasius friction correlation. The Friedel correlation did not predict the two-phase data accurately, especially for high reduced pressure. Using the data taken in the present and in a previous study, a new correlation for two-phase friction pressure drop in small diameter tubes was developed by modifying the Friedel correlation. The new correlation predicts 119 data points with a mean deviation of 11.5%. (C) 2001 Elsevier Science Inc. All rights reserved.
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