A comprehensive frictional-kinetic model for gas–particle flows: Analysis of fluidized and moving bed regimes

Schneiderbauer, Simon; Aigner, Andreas; Pirker, Stefan

doi:10.1016/j.ces.2012.06.041

Cited by 118 publications

(89 citation statements)

References 65 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…On the other hand, the contribution from the inter-S = h small h big particle stresses, i.e. inter-particle collisions, can be deduced from the Eulerian solution using the kinetic theory of granular flows [11].…”

Section: Numerical Modellingmentioning

confidence: 99%

See 1 more Smart Citation

Inhomogeneous Segregation of Binary Mixtures in Fluidized Beds

Puttinger

Schneiderbauer

Berg

et al. 2015

Procedia Engineering

Self Cite

View full text Add to dashboard Cite

This paper deals with segregation effects in of binary mixtures in a 2D fluidized bed. In the experiment initial inhomogeneities in the particle mixture lead to uneven bed pressure drop.This results ininhomogeneous particle segregation and the formation of heap like structures. The effect is clearly reproducible for small particlemass fractions of 40 to 60%. A numerical model based on a hybrid DPM/Euler model was developed and shows a similar behaviour for initial disturbances inthe binary particle mixture.

show abstract

Section: Numerical Modellingmentioning

confidence: 99%

“…For the numerical simulation we use the commercial CFD-solver FLUENT (version 14), whereby we implemented the poly-disperse drag force [10] and the solid stresses of [11] by using user defined functions. For the discretization of all convective terms a second-order upwind scheme is used.…”

Section: Numerical Modellingmentioning

confidence: 99%

Inhomogeneous Segregation of Binary Mixtures in Fluidized Beds

Puttinger

Schneiderbauer

Berg

et al. 2015

Procedia Engineering

Self Cite

View full text Add to dashboard Cite

show abstract

“…The comparison reveals that the boundary conditions of Li and Benyahia (2012) and Schneiderbauer et al (2012a) yield the best predictions of the solids wall shear stresses when plotted against the discrete element results of Louge (1992); in the case of the flux of fluctuation energy the work of Schneiderbauer et al (2012a) appears to be the most developed theory with respect to the reference data of Louge. In many industrial processes, wall bounded gas-solid flows are of crucial importance. On the one hand the powder may be conveyed from a feeding vessel towards its processing point (Schellander et al, 2013); on the other hand solid particles may be processed in fluidized beds, risers as well as moving beds (Schneiderbauer et al, 2012b and references cited therein). In these processes, the movement of the solid particles is strongly affected by the collisions of the particles with the confining walls, which motivated many researchers to study and analyze the details of the particles behavior under the effect of wall-roughness and wall-friction.…”

Section: Introductionmentioning

confidence: 99%

A comparison for different wall-boundary conditions for kinetic theory based two-fluid models

Soleimani

Schneiderbauer

Pirker

2015

International Journal of Multiphase Flow

Self Cite

View full text Add to dashboard Cite

“…It is, therefore, common to investigate particulate flows in large process units using averaged equations of motion, i.e. two-fluid models (TFM), which include the inter-particle collisions statistically by kinetic theory based closures of the particle stresses [9][10][11]. Even though each representative particle diameter requires an additional momentum and continuity equation, which considerably raises the computational demand with increasing number of particle diameters [5,12].…”

Section: Introductionmentioning

confidence: 99%

Numerical Study of a Bi-disperse Gas-solid Fluidized Bed Using an Eulerian and Lagrangian Hybrid Model

Schneiderbauer

Puttinger

Pirker

2015

Procedia Engineering

Self Cite

View full text Add to dashboard Cite

In this paper, we present a hybrid model for the numerical assessment of poly-disperse gas-solid fluidized beds. The main idea of such a modeling strategy is to use a combination of a Lagrangian discrete phase model (DPM) and a kinetic theory based TFM to take advantage of the benefits of those two different formulations. On the one hand, the local distribution of the different particle diameters, which is required for the gas-solid drag force, can be obtained by tracking statistically representative particle trajectories for each particle diameter class. On the other hand, the contribution from the inter-particle stresses, i.e. inter-particle collisions, can be deduced from the TFM solution. These then appear as additional body force in the force balance of the DPM. Note that in a first step we solely consider diameter averaged solids stresses since the drag force is at least on order of magnitude higher than the solids stresses in fluidized beds. Finally, the numerical model is applied to a fluidized bed of a bi-disperse mixture of glass particles (0.5 mm and 2.5 mm particles) and with a cross-section of 0.15 m x 0.02 m. The results are then analyzed with respect to experimental data of Puttinger et al [1]. This comparison demonstrates that the computed bed hydrodynamics is in fairly good agreement with the experiment. However, the results also suggest that sub-grid drag corrections [2-4] for polydisperse fluidized beds are required to make the numerical investigation of industrial scale fluidized bed units accessible.

show abstract

A comprehensive frictional-kinetic model for gas–particle flows: Analysis of fluidized and moving bed regimes

Cited by 118 publications

References 65 publications

Inhomogeneous Segregation of Binary Mixtures in Fluidized Beds

Inhomogeneous Segregation of Binary Mixtures in Fluidized Beds

A comparison for different wall-boundary conditions for kinetic theory based two-fluid models

Numerical Study of a Bi-disperse Gas-solid Fluidized Bed Using an Eulerian and Lagrangian Hybrid Model

Contact Info

Product

Resources

About