Kinetic theory based CFD simulation of turbulent fluidization of FCC particles in a riser

Jiradilok, Veeraya; Gidaspow, Dimitri; Damronglerd, Somsak; Koves, William J.; Mostofi, Reza

doi:10.1016/j.ces.2006.04.006

Cited by 177 publications

(117 citation statements)

References 51 publications

Supporting

Mentioning

105

Contrasting

Order By: Relevance

“…Figure 4 shows typical contour of granular temperature for riser as well as downer. Jiradilok et al (2006) obtained granular temperature of the order of 0.1-10 m 2 /s 2 for riser via Euler-Euler simulations. Similarly we obtained granular temperature of the order of 0.01 m 2 /s 2 (case R.3 and R.4) for riser with relatively smaller dimensions.Tables 3 and 4 summarize the DEM simulations carried out under various operating conditions for upflow and downlow mode respectively.…”

Section: Resultsmentioning

confidence: 99%

DEM Simulation of Gas-Solids Circulating Fluidized Beds

Suryawanshi

Roy

2009

J. Chem. Eng. Japan

View full text Add to dashboard Cite

Gas-solids circulating fluidized beds involve multiscale interactions and hence it is a challenge to model flow in such a system with detail at a particle level. In present work, flow in co-current upflow mode (riser) as well as co-current downflow mode (downer) is simulated using distinct element method (DEM). Simulations were performed for number of operating conditions. Detailed post processing results of the fluctuational kinetic energy (granular temperature) are presented.

show abstract

Section: Resultsmentioning

confidence: 99%

DEM Simulation of Gas-Solids Circulating Fluidized Beds

Suryawanshi

Roy

2009

J. Chem. Eng. Japan

View full text Add to dashboard Cite

show abstract

“…In the FCC riser a huge number of solid particles are interacting with a hydrocarbon mixture which, due to low or moderate pressure and high temperature conditions, vaporises and cracks to form lighter compounds and behaves almost like a gaseous phase. Professor Gidaspow proposed an original approach for modeling the solid as a fluid via a kinetic approach and a granular temperature concept (Gidaspow, 1994), which has been seen to be successful for global flow patterns in risers (Neri and Gidaspow, 2000;Jiradilok et al, 2006). This approach is different from what can be obtained with a multi-scale approach as used by van der Hoef et al (2004), but it can be seen as an efficient approach to perform more applied process design calculations.…”

Section: Fcc Gas-solid Flowmentioning

confidence: 95%

CFD Applied to Process Development in the Oil and Gas Industry – A Review

Raynal

Augier

Bazer-Bachi

et al. 2015

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

View full text Add to dashboard Cite

-Computational Fluid Dynamics (CFD) is increasingly used in the oil and gas industry. The present article aims to show how CFD can be used at all steps of the development of a new process, with a focus on refining technologies. Those different steps consist first of setting up tools that will be used during the development phase, second of obtaining data in complement with experiments required for the process development, and finally, of troubleshooting actions or technology developments that will make the process even more efficient. A large number of applications corresponding to various flow configurations, single-phase or gas-liquid, gas-solid or even gas-liquid-solid, characterised by significantly different scales and requiring adapted simulation approaches, are discussed based on original results and a review of the literature. Perspectives are given in particular on the multi-scale approach and physical phenomena coupling.Résumé -La simulation numérique des écoulements appliquée au développement de procédés dans le monde de l'industrie du pétrole et du gaz -une revue -La simulation numérique des écoulements, ou Computational Fluid Dynamics (CFD), est un outil de plus en plus employé dans les secteurs pétrolier et gazier. Cet article permet d'illustrer comment l'outil numérique est utilisé lors des différents stades de développement d'un nouveau procédé, en particulier dans le monde du raffinage. Ces différentes phases correspondent tout d'abord à la mise au point des équipements qui seront utilisés pour le développement, puis au complément des essais lors de la phase de développement proprement dite et enfin à des actions support pour la résolution de problèmes opératoires ou l'amélioration de technologies qui permettront d'optimiser le procédé. De nombreuses applications correspondant à différents types d'écoulements, monophasique ou gaz-liquide, gazsolide et gaz-liquide-solide, caractérisées par des échelles de résolution différentes et requérant des approches de simulations adaptées sont discutées sur la base de résultats originaux et d'une revue de travaux déjà publiés. Des perspectives sont aussi données tant sur les aspects approche multi-échelles que sur le couplage de phénomènes.

show abstract

“…Optimum designs of the industrial processes or reliable predictions of natural phenomena may be achieved when the physics governing these particulate flows will be thoroughly understood and accuretaly modeled. 1,2 Usual designs of engineering configurations are often based on empirical rules and modeling. The purpose of our study is to contribute to developing and validating macroscopic models recommended for gas-solid suspension flows.…”

Section: Introductionmentioning

confidence: 99%

Flow of particles suspended in a sheared viscous fluid: Effects of finite inertia and inelastic collisions

et al. 2010

View full text Add to dashboard Cite

in Wiley Online Library (wileyonlinelibrary.com).We investigate in this article the macroscopic behavior of sheared suspensions of spherical particles. The effects of the fluid inertia, the Brownian diffusion, and the gravity are neglected. We highlight the influence of the solid-phase inertia on the macroscopic behavior of the suspension, considering moderate to high Stokes numbers. Typically, this study is concerned with solid particles O (100 lm) suspended in a gas with a concentration varying from 5% to 30%. A hard-sphere collision model (with elastic or inelasic rebounds) coupled with the particle Lagrangian tracking is used to simulate the suspension dynamics in an unbounded periodic domain. We first consider the behavior of the suspension with perfect elastic collisions. The suspension properties reveal a strong dependence on the particle inertia and concentration. Increasing the Stokes number from 1 to 10 induces an enhancement of the particle agitation by three orders of magnitude and an evolution of the probability density function of the fluctuating velocity from a highly peaked (close to the Dirac function) to a Maxwellian shape. This sharp transition in the velocity distribution function is related to the time scale which controls the overall dynamics of the suspension flow. The particle relaxation (resp. collision) time scale dominates the particulate phase behavior in the weakly (resp. highly) agitated suspensions. The numerical results are compared with the prediction of two statistical models based on the kinetic theory for granular flows adapted to moderately inertial regimes. The suspensions have a Newtonian behavior when they are highly agitated similarly to rapid granular flows. However, the stress tensors are highly anisotropic in weakly agitated suspensions as a difference of normal stresses arises. Finally, we discuss the effect of energy dissipation due to inelastic collisions on the statistical quantities. We also tested the influence of a simple modeling of local hydrodynamic interactions during the collision by using a restitution coefficient which depends on the local impact velocities.

show abstract

Kinetic theory based CFD simulation of turbulent fluidization of FCC particles in a riser

Cited by 177 publications

References 51 publications

DEM Simulation of Gas-Solids Circulating Fluidized Beds

DEM Simulation of Gas-Solids Circulating Fluidized Beds

CFD Applied to Process Development in the Oil and Gas Industry – A Review

Flow of particles suspended in a sheared viscous fluid: Effects of finite inertia and inelastic collisions

Contact Info

Product

Resources

About