Abstract
Particleresolved direct numerical simulations of a 3D liquid–solid fluidized bed experimentally investigated by AguilarCorona (2008) have been performed at different fluidization velocities (corresponding to a range of bed solid volume fraction between 0.1 and 0.4), using Implicit Tensorial Penalty Method. Particle Reynolds number and Stokes number are O(100) and O(10), respectively. In this paper, we compare the statistical quantities computed from numerical results with the experimental data obtained with 3D trajectography and High Frequency PIV. Fluidization law predicted by the numerical simulations is in very good agreement with the experimental curve and the main features of trajectories and Lagrangian velocity signal of the particles are well reproduced by the simulations. The evolution of particle and flow velocity variances as a function of bed solid volume fraction is also well captured by the simulations. In particular, the numerical simulations predict the right level of anisotropy of the dispersed phase fluctuations and its independence of bed solid volume fraction. They also confirm the high value of the ratio between the fluid and the particle phase fluctuating kinetic energy. A quick analysis suggests that the fluid velocity fluctuations are mainly driven by fluid–particle wake interactions (pseudoturbulence) whereas the particle velocity fluctuations derive essentially from the large scale flow motion (recirculation). Lagrangian autocorrelation function of particle fluctuating velocity exhibits largescale oscillations, which are not observed in the corresponding experimental curves, a difference probably due to a statistical averaging effect. Evolution as a function of the bed solid volume fraction and the collision frequency based upon transverse component of particle kinetic energy correctly matches the experimental trend and is well fitted by a theoretical expression derived from Kinetic Theory of Granular Flows.
Original language  English 

Pages (fromto)  228240 
Number of pages  13 
Journal  International Journal of Multiphase Flow 
Volume  89 
Early online date  16 Nov 2016 
DOIs  
Publication status  Published  Mar 2017 
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Profiles

Ali Ozel
 School of Engineering & Physical Sciences  Assistant Professor
 School of Engineering & Physical Sciences, Institute of Mechanical, Process & Energy Engineering  Assistant Professor
Person: Academic (Research & Teaching)