Abstract
The objective of present study is to elucidate the mechanism of modification of turbulence structure in gas-liquid bubbly flow. The experiment consisted of a fully developed vertical upward pipe flow with 9700 of Reynolds number and less than 1.0% of void fraction. In order to obtain fundamental knowledge of the effects of void fraction and bubble diameter on modification of turbulence structure experimentally, we explored the two-dimensional flow structure in the vicinity of bubbles by applying PIV with fluorescent tracer particles, and also bubble shapes and positions were obtained by projecting shadow-image technique. It is suggested that the high concentrated bubbles in the vicinity of the wall disturb the transport of turbulence energy produced by the wall shear layer toward the middle of pipe. Thus the fluctuation velocity is remarkably reduced at the wide region of the pipe center.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: 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.
