Numerical Simulations of the Effect of Conical Dimension on the Hydrodynamic Behaviour in Spouted Beds

He, Yurong; Zhao, Guangbo; Bouillard, Jacques; Lu, Huilin

doi:10.1002/cjce.5450820104

Cited by 9 publications

(2 citation statements)

References 29 publications

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“…For the conventional conical–cylindrical spouted beds, one of the significant uncertainties is the influence of conical section geometry which proves to be essential to the gaseous reactants reacting time and residence time in the industrial processes. Since most previous studies have just focused on the columns with the conical angle of 60°, the fixed geometric condition questions to what extent the influence of the conical geometry of the spouted bed on the hydrodynamics of the whole beds are, while somewhat differences in hydrodynamics have been observed in shallow spouted beds and nearly flat base spouted beds …”

Section: Introductionmentioning

confidence: 99%

Evaluation on the effect of conical geometry on flow behaviours in spouted beds

et al. 2013

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Evaluation on the effect of conical section geometry on the gas–solid flow behaviours in conical–cylindrical spouted beds were carried out by three‐dimensional computational fluid dynamics (CFD) coupling with two‐fluid model (TFM). The simulations were implemented in seven columns with their conical angles ranging from 30° to 180°. The solid flow pattern, particle velocity, voidage, fountain height and the spout diameter were investigated. It was found that unstable spouting would occur when the conical angle is less than 30°. In addition, the conical angle of 105° might be a borderline value for gas–solid flow behaviours in the spout. In this region, increasing conical angle leads to a decrease in fountain height, particle velocity and voidage and an increase in the spout diameter when the conical angle is within 105°, while reverse trends could be found when the conical angle is beyond 105°. The smallest fountain height, particle velocity and voidage and largest spout diameter could be found when the angle is 105°. In spite of these, the particle velocity in the annulus continually increases with increasing conical angle.

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Section: Introductionmentioning

confidence: 99%

Evaluation on the effect of conical geometry on flow behaviours in spouted beds

et al. 2013

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“…A paste-like agglomerate surely benefits from such a geometrical configuration which assures the intermixing of the solids and close contact with the drying fluid medium. The flow characteristics of spouted beds equipped with a non-porous draft tube (SBDT) was revised by Ijichi et al (1998) and recently by Ishikura et al (2003), while some papers have studied solid circulation in the bed, and the hydrodynamics and the flow regimes that occur inside SB and SBDT Ishikura et al, 2003;Ji et al, 1997, Ji, Tsutsumi, & Yoshida, 1998Larachi, Grandjean, & Chaouki, 2003;Muir et al, 1990;Olazar et al, 1996;Yurong, Guangbo, Bouillard, & Huilin, 2004). Modifications to the classic scheme were adopted by Lim et al (1988), and by Hattori et al (2001) who adopted a second air feed in the annulus of their spout-fluid bed (SFB) which was sometimes equipped with draft tubes (SFBDT).…”

Section: Introductionmentioning

confidence: 99%

Low temperature drying of pomace in spout and spout-fluid beds

Marmo

2007

Journal of Food Engineering

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An overview on the recent advances in computational fluid dynamics simulation of spouted beds

Bao

2013

Can J Chem Eng

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Spouted beds are now widely applied in various physical operations and chemical reaction systems due to their unique structural and flow characteristics. Now there are growing interests to use computational fluid dynamics (CFD) to understand dense gas-solid two-phase flows in spouted beds. Both Eulerian-Eulerian (two-fluid model, TFM) and Eulerian-Lagrangian (discrete element method, DEM) approaches can be applied to the CFD modelling of spouted beds and spouted-fluidised beds, and numerous verification studies have shown their reliabilities. This overview summarises the recent advances of the TFM and DEM approaches in the CFD modelling of spouted beds. The typical flow patterns of spouted beds can be well reproduced by both the TFM and the DEM approaches, and the simulated characteristic properties such as spout diameter, minimum spouting velocity and voidage profile are in good agreement with experimental data, indicating that CFD modelling based on the TFM and DEM approaches can serve as an important tool for predicting gas and solids behaviour in spouted beds. The TFM approach has been widely used in phenomenological studies that are mainly towards the understanding of the flow behaviour of the whole system. Although more computational capacity is required, the DEM approach offers a more natural way to simulate gas-solid flows, with each individual particle tracked in the simulation and can be applied readily for particle tracking, collision, mixing, circulation and mass transfer studies that are aimed at obtaining the profound particle-scale understanding in fluid-solid multiple-phase systems. However, each approach has its own limitations and defects. The complex nature of the TFM-based simulation framework requires both proper descriptions of pseudo-fluid properties like solid pressure, solid viscosity, solid friction stresses, etc. and suitable choice of drag models, and the boundary conditions also have effects on the simulation results. Moreover, the effects of these factors often interact with each other, which require even more subtle skills in conducting a simulation. In the DEM approach, the high computing source requirement limits its application of no more than several million particles. Furthermore, more insight investigation should be given to the acting mechanism of several forces on particles. One common challenge for these two approaches is to properly describe the inherent turbulence for both the solid and gas phases, especially for the spout region. Further fundamental and experimental studies on the kinematic properties of the two phases are needed to improve the accuracy of the CFD models.

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Numerical Simulations of the Effect of Conical Dimension on the Hydrodynamic Behaviour in Spouted Beds

Cited by 9 publications

References 29 publications

Evaluation on the effect of conical geometry on flow behaviours in spouted beds

Evaluation on the effect of conical geometry on flow behaviours in spouted beds

Low temperature drying of pomace in spout and spout-fluid beds

An overview on the recent advances in computational fluid dynamics simulation of spouted beds

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