Numerical simulation of particulate flow by the Eulerian–Lagrangian and the Eulerian–Eulerian approach with application to a fluidized bed

Chiesa, Matteo; Mathiesen, Vidar; Melheim, Jens A.; Halvorsen, Britt

doi:10.1016/j.compchemeng.2004.09.002

Cited by 187 publications

(95 citation statements)

References 12 publications

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“…21a and 21b, respectively. As it is depicted in these figures, the erosion rate can be expressed by a linear curve in the logarithmic scale as follows: (20) where,  is a constant to be determined, s f is the dimensionless average shape factor of the sand particles which needs no reference value to make it dimensionless. The shape factor of 0 represents a disc shaped particle and 1 a spherical shaped particle.…”

Section: Solid Particle Shape Effectsmentioning

confidence: 99%

Investigation of Hydroabrasion in Slurry Pipeline Elbows and T-junctions

Azimian¹,

Bart²

2014

JEPE

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Abstract:The present study demonstrates the comparison of erosion rate of critical pipeline parts, namely elbow and T-junction which face the maximum erosion in a pipeline and may cause an early damage and failure of the system. CFD (computational fluid dynamics) with an Eulerian-Lagrangian approach coupled with an approved erosion model is applied to visualize the 3-D flow behavior of slurry flow in both parts and to predict the erosion rate and the location of erosion at the internal surfaces. The analysis of slurry erosion is performed in five steps; geometry and grid generation, grid study/refinement, fluid flow solution, solid particles tracking and finally, the erosion calculation. In previous publications in literature considering transportation of gas-solid flows in pipe parts, the application of T-junctions instead of elbows for specified conditions in order to reduce the erosion is recommended. In this article, it is approved that for liquid-solid flows, the Stokes number is reasonably smaller than the values for gas-solid flows. This causes the solid particles tightly couple to the fluid phase and to travel more closely with the fluid streamlines. The effects of important influencing parameters such as feed flow velocity, solid concentration, particle size and shape are investigated in detail in current work. It was found that for liquid-solid flows, the erosion of T-junction for all of the mentioned influencing parameters, due to its geometrical specifications and Stokes number variation in comparison with gas-solid flows, is reasonably higher than erosion of elbow. Due to these findings, in contrary to the gas-solid mixture flows, application of T-junction instead of elbow for liquid-solid flow transportation is not recommended.

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Section: Solid Particle Shape Effectsmentioning

confidence: 99%

Investigation of Hydroabrasion in Slurry Pipeline Elbows and T-junctions

Azimian¹,

Bart²

2014

JEPE

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“…Gidaspow et al [1,11] have extended the kinetic theory of dense gases for binary granular mixture with unequal granular temperature between the particle phases. In the some researches [10,[14][15][16] the following algebraic granular temperature equation was used with the assumptions that the granular energy is dissipated locally, the convection and diffusion contributions are negligible and retaining only the generation and dissipation terms. Also van Wachem et al [14][15][16] have shown that this assumption is feasible in the bubbling region of a fluidized bed.…”

Section: Basic Equationmentioning

confidence: 99%

“…In the some researches [10,[14][15][16] the following algebraic granular temperature equation was used with the assumptions that the granular energy is dissipated locally, the convection and diffusion contributions are negligible and retaining only the generation and dissipation terms. Also van Wachem et al [14][15][16] have shown that this assumption is feasible in the bubbling region of a fluidized bed. When using this algebraic equation in stead of solving the balance for the granular temperature, much faster convergence is obtained during simulations.…”

Section: Basic Equationmentioning

confidence: 99%

“…This CFD model was based on a two-fluid model including the kinetic theory of granular flows. Chiesa et al [16] have presented a computational study of the flow behavior of a lab-scale fluidized bed. The results obtained from a 'discrete particle method' (DPM) were qualitatively compared with the results obtained from a multi-fluid computational fluid dynamic (CFD) model.…”

Section: Introductionmentioning

confidence: 99%

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Study of Heat Transfer and Hydrodynamics in the Fluidized Bed Reactors

Hamzehei¹

2011

Heat Transfer - Mathematical Modelling, Numerical Methods and Information Technology

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“…Also, gas temperature increases as it moves upward in the chamber due to the heat of polymerization reaction leading to the higher temperatures at the top of the bed. Chiesa et al [12] have presented a computational study of the flow behavior of a labscale fluidized bed. They have also compared experiments results of a two-dimensional lab-scale bubbling fluidized bed with their computational results.…”

Section: Introductionmentioning

confidence: 99%