Volume 74, Number 2, April 2006
|Page(s)||268 - 274|
|Section||Electromagnetism, optics, acoustics, heat transfer, classical mechanics, and fluid dynamics|
|Published online||15 March 2006|
Granular temperature distribution in a gas fluidized bed of hollow microparticles prior to onset of bubbling
Institute for Materials and Processes, University of Edinburgh, King's Buildings Mayfield Road, Edinburgh, EH9 3JL, UK
2 School of Physics, University of Edinburgh, King's Buildings Mayfield Road, Edinburgh, EH9 3JL, UK
3 School of Chemistry, University of Edinburgh, King's Buildings Mayfield Road, Edinburgh, EH9 3JL, UK
Corresponding author: M.Biggs@ed.ac.uk.
Accepted: 21 February 2006
It has been unclear whether bubbles are required to induce particle velocity fluctuations in gas fluidized beds (FBs). We show that bubbles are not necessary by applying diffusing-wave spectroscopy to particles whose minimum bubbling velocity is approximately 5 times that of the minimum fluidization velocity. Fluctuations are first observed at or just above fluidization and increase in magnitude with superficial velocity. The distribution of velocity fluctuations in the bed is also presented: they are symmetrical about the centreline where they are maximal and increase with height above the distributor.
PACS: 45.70.Mg – Granular flow: mixing, segregation and stratification / 47.55.Kf – Particle-laden flows / 42.62.Fi – Laser spectroscopy
© EDP Sciences, 2006
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