Two-phase frictional pressure drop measurements in U-type wavy tubes subject to horizontal and vertical arrangements

Influence of oil on R-410A two-phase fri

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