Abstract
Particle image velocimety (PIV) was used to study the motion of a single bubble as it approached and then broke through the top surface of a two-dimensional (2D) gas-fluidized bed. A digital camera recorded the motion of individual particles; this led, via computer analysis, to a complete set of particle velocity vectors around the bubble, particularly its roof, as the bubble broke through the bed surface. These results revealed the following: (1) The vorticity around the bubble is close to zero, except for the wake region at the bottom of the bubble, justifying the use of potential flow theory to predict the bubble motion around the bubble, apart from the wake. (2) Potential flow analysis, for a cylinder moving through infinite fluid, was used to predict the particle velocities for the bubble roof as the bubble broke through the surface of the bed. There is good agreement between theory and experiment for the roof velocities. (3) The experiments suggest that bubble eruption occurs when the thickness of ...
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.
