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Discrete Particle Model for simulating liquid-solid fluidization

Abbas, Micheline and Van der Hoef, Martin and Kuipers, Hans Discrete Particle Model for simulating liquid-solid fluidization. (2010) In: 7th International Conference of Multiphase Flows , 30 May - 04 June 2010, Tampa, USA .

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Abstract

We have used the discrete particle model combined with computational fluid dynamics for the continuous phase (DPM) to simulate the fluidization of 0.165 mm glass particles in water, and compare with the experiments of Zivkovic et al. (2009). The added mass and lubrication forces are included in the model, whereas they are generally neglected in the simulation of gas-solid and also most of the liquid-solid systems. The statistical quantities related to the discrete phase were calculated using the space and / or time averages (pressure drop, bed height, stress developed in the system …). The expansion curve of the fluidized bed, obtained using the DPM, has a similar trend as the experimental one. This expansion curve depends on the choice of the drag force which is the key element in the two-way coupling between the solid and liquid phases. The granular temperature of the solid phase is calculated from the fluctuating velocities of the particles. As in the experiments, the granular temperature is nearly equal to the square root of the superficial liquid velocity, and reaches a ceiling at high velocities when an equilibrium between the kinetic and collisional momentum transfer is reached. The particle velocity fluctuations are anisotropic. Small and large scale fluctuations are observed and their influence on the local granular temperature is shown explicitly. In contrast to the gas-solid fluidization, the choice of the restitution coefficient has a minor influence on the statistical behavior of the liquid fluidized bed. The inclusion in the model of the added mass force and viscous lubrication forces between colliding particles does not have a significant impact on the macroscopic bed properties.

Item Type:Conference or Workshop Item (Paper)
Audience (conference):International conference proceedings
Uncontrolled Keywords:
Institution: Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
Other partners > University of Twente (NETHERLANDS)
Laboratory name:
Laboratoire de Génie Chimique - LGC (Toulouse, France) - Génie des Interfaces & Milieux Divisés (GIMD)
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Deposited By: Micheline ABBAS

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