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Two-phase frictional pressure drop of R-134a and R-410A refrigerant–oil mixtures in straight tubes and U-type wavy tubes

✍ Scribed by Ing Youn Chen; Yu-Shi Wu; Yu-Juei Chang; Chi-Chuan Wang

Book ID
108130808
Publisher
Elsevier Science
Year
2007
Tongue
English
Weight
632 KB
Volume
31
Category
Article
ISSN
0894-1777

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Influence of oil on R-410A two-phase frictional pressure drop in a small U-type wavy tube
✍ I.Y. Chen; C.L. Won; C.C. Wang 📂 Article 📅 2005 🏛 Elsevier Science 🌐 English ⚖ 207 KB

This study presents single-phase and two-phase pressure drop data with oil concentration C = 0, 1, 3 and 5% in a copper wavy tube having an inner diameter of 3.25 mm and a curvature radius of 6.35 mm. The ratio of frictional factor between U-bend in wavy tube and straight tube ( f C /f S ) is about