Numerical investigation of the time-related properties of solid phase in a 3-D spout-fluid bed

Luo, Kun; Wu, Fan; Yang, Shiliang; Fan, Jianren

doi:10.1016/j.cej.2014.12.064

Cited by 14 publications

(4 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Liu et al 21 investigated and demonstrated the role of bubbles on solid mixing, and mixing mechanisms were explored in a bubbling fluidized. Luo et al 22,23 and Saidi et al 24 investigated the effect of a draft tube and pulsed gas delivery on the solid mixing characteristics of spouted bed, respectively. However, most prior numerical simulations assumed that particles were spherical.…”

Section: Introductionmentioning

confidence: 99%

An application of factor analysis in wet particle systems: Rolling friction and cohesive liquid controlling performances

Tang

Wang

Ren

et al. 2020

Asia-Pacific J Chem Eng

View full text Add to dashboard Cite

Fluidized beds are widely used in many chemical engineering industrials, and flow behaviors of multiphase flow have always been the focus of research. This paper presented how rolling friction and cohesive liquid affected wet particle flow behaviors by experiments, simulation, and data analyses. Experiments were conducted for applying a suitable range of rolling friction coefficient. A discrete element method, well validated by comparing experimental data, was developed and demonstrated that μ r = 0.125 was a good choice for particles applied in this work. Data from numerical results were well analyzed by factor analysis, where explained interaction effect of two factors on fluidized beds. Factor analyses reflected that dominating factor and interaction effect on flow behaviors vary instead of single control factor in different regions. These findings have clearly showed importance and effect of microscopic parameter collision characteristics on the hydrodynamic behaviors in fluidized beds. Thus, rolling friction constitutes should be carefully considered to ensure that theoretical results are accurate.

show abstract

Section: Introductionmentioning

confidence: 99%

An application of factor analysis in wet particle systems: Rolling friction and cohesive liquid controlling performances

Tang

Wang

Ren

et al. 2020

Asia-Pacific J Chem Eng

View full text Add to dashboard Cite

show abstract

“…Tsuji et al (1993) coupled DEM proposed by Cundall and Strack (1979) with CFD to describe the gas-solid two-phase flow in fluidized beds. Currently, CFD-DEM has been widely used to evaluate the flow characteristics of spherical particles in bubbling fluidized beds (Müller et al 2008;Luo et al 2014;Wang et al 2015;Wang et al 2016a, b;Liu and van Wachem 2019), spouted beds (Takeuchi et al 2004;He et al 2016) and spouted fluidized beds (Luo et al 2015;Van Buijtenen et al 2011;Tang et al 2017;Wang et al 2016c).…”

Section: Introductionmentioning

confidence: 99%

Non-spherical particle mixing behaviors by spherical inert particles assisted in a fluidized bed

et al. 2019

View full text Add to dashboard Cite

Fluidized beds are widely used in many industrial fields such as petroleum, chemical and energy. In actual industrial processes, spherical inert particles are typically added to the fluidized bed to promote fluidization of non-spherical particles. Understanding mixing behaviors of binary mixtures in a fluidized bed has specific significance for the design and optimization of related industrial processes. In this study, the computational fluid dynamic-discrete element method with the consideration of rolling friction was applied to evaluate the mixing behaviors of binary mixtures comprising spherocylindrical particles and spherical particles in a fluidized bed. The simulation results indicate that the differences between rotational particle velocities were higher than those of translational particle velocities for spherical and non-spherical particles when well mixed. Moreover, as the volume fraction of the spherocylindrical particles increases, translational and rotational granular temperatures gradually increase. In addition, the addition of the spherical particles makes the spherocylindrical particles preferably distributed in a vertical orientation. Keywords Non-spherical particle • Fluidized bed • Discrete element method • Binary mixtures Abbreviations CFD Computational fluid dynamic DEM Discrete element method LSD Linear spring dashpot List of symbols C D Drag coefficient d p Particle diameter, m F c Contact force, N F d Drag force, N g Gravitational acceleration, m/s 2 I p Moment of inertia, kg m 2 k Spring stiffness, N/m m p Particle mass, kg M Lacey Lacey mixing index N Number Re Reynolds number r p Position of particle center, m S p Momentum exchange source term, kg/(m 2 s 2) t Time, s T c Torque generated by contact force, N m T r Torque generated by rolling friction, N m u g Gas velocity, m/s Vol Volume fraction of spherocylindrical particles V p Particle volume, m 3 v p Particle translational velocity, m/s Subscript c Contact g Gas phase L Local coordinate system n Normal direction p Particle phase rot Rotation t Tangential direction tran Translation Greek letters β Interphase momentum exchange coefficient, kg/ (m 3 s) δ Elastic deformation, m

show abstract

“…Furthermore, Goniva et al studied the influence of rolling friction on the bed hydrodynamics of the spout‐fluid bed; Sutkar et al modeled a pseudo‐2D spout‐fluid bed with a draft plate by means of a scaled discrete particle model and showed that the variation in bed height is highly influenced by the extent of gas‐bypassing and the rate of cluster formation; Saidi et al studied a rectangular spout‐fluid bed using the CFD–DEM coupling approach, and found that wall effect on gas flow is non‐negligible for small bed depth. Recently, Yang et al applied the CFD–DEM coupling approach in different flow regimes to study the influence of operating parameters on bed hydrodynamics, solid dispersion, and time‐related properties of solid phase …”

Section: Introductionmentioning

confidence: 99%

CFD–DEM investigation into the scaling up of spout‐fluid beds via two interconnected chambers

et al. 2016

Self Cite

View full text Add to dashboard Cite

The hydrodynamics and chamber interaction in a three-dimensional spout-fluid bed with two interconnected chambers are investigated via computational fluid dynamics coupled with discrete element method (CFD-DEM), because multiple interconnected chambers are key to scaling up spout-fluid beds. The overall solid motion, spouting evolution, and spoutannulus interface is studied, followed by time-averaged hydrodynamics, particle-scale information, spout-annulus interaction, and inter-chamber interaction. The results show that inter-chamber interactions lead to unique characteristics distinct from that for a single-chamber system, including (1) asymmetry of the hydrodynamics within each chamber, (2) alternative spouting behavior in the two chambers, (3) smaller pressure drop in terms of magnitude and fluctuations, (4) two peaks in the solid residence time (SRT) frequency histogram of the annulus, (5) average SRT in the spout is twice that in a single-chamber, and (6) larger solid dispersion in all three directions. The results provide meaningful understanding for the scale-up of spout-fluid beds.In view of its excellent performance and widespread application, numerous experimental efforts have unsurprisingly focused on various aspects of this apparatus, spanning the hydrodynamics, 11,12 solid circulation, 13,14 particle velocity profile, 15 pressure drop 16 and fluctuation, 17 flow reigme, 18-20 maximum bed height, 21 particle mixing, 22 minimum spouting velocity, 23 effect of draft plates, 24-26 thermal behavior, 27 and so on. In tandem with experimental investigations, the numerical simulation of the dense two-phase flow has progressed too. As is well-acknowledged, two approaches, namely, the twofluid model (TFM) and computational fluid dynamics combined with discrete element method (CFD-DEM), are available to model the dense gas-solid flow. 28,29 The critical difference between these two approaches lies in the resolution of the solid motion: the solid phase is treated as a continuum and tracked individually in the Lagrangian framework in TFM and CFD-DEM, respectively. Zhong et al. 30 numerically explored the gas/solid flow in the three-dimensional (3-D) spout-fluid bed using TFM, wherein the kinetic theory of granular flow provided the closures. The results demonstrated that the simulation results are strongly affected by the restitution

show abstract

Numerical investigation of the time-related properties of solid phase in a 3-D spout-fluid bed

Cited by 14 publications

References 42 publications

An application of factor analysis in wet particle systems: Rolling friction and cohesive liquid controlling performances

An application of factor analysis in wet particle systems: Rolling friction and cohesive liquid controlling performances

Non-spherical particle mixing behaviors by spherical inert particles assisted in a fluidized bed

CFD–DEM investigation into the scaling up of spout‐fluid beds via two interconnected chambers

Contact Info

Product

Resources

About