L. Xie et al 2006 Europhys. Lett. 74 268 doi:10.1209/epl/i2005-10526-y
L. Xie1, M. J. Biggs1, D. Glass1, A. S. McLeod1, S. U. Egelhaaf2,3 and G. Petekidis2
Show affiliationsIt 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.
47.55.Kf Multiphase and particle-laden flows
45.70.Mg Granular flow: mixing, segregation and stratification
Issue 2 (April 2006)
Received 21 October 2005, accepted for publication 21 February 2006, in final form 21 February 2006
Published 15 March 2006
L. Xie et al 2006 Europhys. Lett. 74 268
Murat Durandurdu 2006 J. Phys.: Condens. Matter 18 4887
P L Jain and G Singh 2007 J. Phys. G: Nucl. Part. Phys. 34 129