Frictional performance of R-22 and R-410A inside a 5.0 mm wavy diameter tube |
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| Authors: | Chi-Chung Wang Ing Youn Chen |
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| Affiliation: | a Energy & Resources Laboratories, Industrial Technology Research Institute, Bldg. 64, 195-6 Section 4, Chung Hsing Road, Chutung, Hsinchu, 310 Taiwan
b Graduate School of Engineering Science & Technology, National Yunlin University of Science and Technology, 640 Taiwan |
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| Abstract: | The influence of return bend on the frictional performance of R-410A and R-22 in a 5-mm diameter tube is examined with a curvature ratio of 6.63. The existing single-phase correlations give fairly good agreements with the present single-phase data, but the existing two-phase correlations of the return bend fail to predict the present two-phase data. For test results of the two-phase flow at G?200 kg m−2 s−1, ((dP/dz)c/(dP/dz)s) is approximately equal to 1.8 and is relatively independent of the vapor quality x. However, at a smaller mass flux of 100 kg m−2 s−1, ((dP/dz)c/(dP/dz)s) decreases with x, reaching approximately 5 for x=0.1. The significant increase of this ratio for G increased from 100 to 200 kg m−2 s−1 may be attributed to the change of the two-phase flow pattern. |
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