Abstract
Two-phase frictional performance of air‐water mixture flow in six horizontal U-type wavy tubes is presented. The inner diameters of the wavy tubes are 5.07 and 8.29 mm, whereas the curvature ratios span from 3.94 to ∼7.87. The two-phase superficial velocities for air and water are in the range of UL,S = 0.02‐0.7 m/s and UG,S = 0.15‐60 m/s. The measured pressure loss in bend included the loss in U bends and the loss caused by the distorted flow in the downstream straight tube. This leads to the definition of the equivalent frictional two-phase pressure gradient in the U bend. The ratio between the two-phase pressure gradient in the U-bend and the two-phase pressure gradient in the upstream straight tube is found in the range of 1.5‐3 for most of the data. The ratios increase with gas quality due to consecutive accelerating/deaccelerating phenomenon caused by the wavy tube. The frictional twophase multiplier in the U bend can be correlated by the use of the Chisholm correlation. By introduction of the Martinelli parameter and the liquid Froude number to the Chisholm correlation, a new correlation is proposed that can describe the present φ 2,L data with a mean deviation of 13.9%.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.