Analysis of gamma-ray imaging data to describe hydrodynamic properties of gas–polyethylene fluidized beds
✍ Scribed by Taghi Zarabi; Apostolos Kantzas
- Book ID
- 102803949
- Publisher
- John Wiley and Sons
- Year
- 2000
- Tongue
- English
- Weight
- 880 KB
- Volume
- 78
- Category
- Article
- ISSN
- 0008-4034
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✦ Synopsis
Abstract
A scintillation gamma camera was used for measuring the instantaneous velocity profile and average velocity as well as the trajectories of a radioactive particle in small laboratory scale air–polyethylene–fluidized beds. A large number of frames, with frequencies between 1 and 50 Hz, were analyzed to investigate the effects of bed height, gas velocity and particle morphology. Subsequently: (1) horizontal and axial variations of the particle velocity were found; (2) three different flow zones along the axis (i.e., entrance zone, circulation zone and free board) were quantified; and (3) a characteristic time and a new definition of circulation (cycle) period were introduced. It was also found that the particle sometimes oscillates in the free board or gets trapped in the entrance zone.