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Clustering instabilities in sedimenting fluid–solid systems: critical assessment of kinetic-theory-based predictions using direct numerical simulation data

Journal Article · · Journal of Fluid Mechanics
DOI:https://doi.org/10.1017/jfm.2017.295· OSTI ID:1832979
 [1];  [2];  [3];  [4]
  1. Univ. of Colorado, Boulder, CO (United States); Univ of Colorado at Boulder
  2. Harbin Inst. of Technology (China)
  3. Colorado School of Mines, Golden, CO (United States)
  4. Univ. of Colorado, Boulder, CO (United States)

In this paper the quantitative and qualitative ability of a kinetic-theory-based two-fluid model (KT-TFM) is assessed in a state of fully periodic sedimentation (fluidization), with a focus on statistically steady, unstable (clustered) states. The accuracy of KT-TFM predictions is evaluated via direct comparison to direct numerical simulation (DNS) data. The KT-TFM and DNS results span a rather wide parameter space: mean-flow Reynolds numbers on the order of 1 and 10, mean solid volume fractions from 0.1 to 0.4, solid-to-fluid density ratios from 10 to 1000 and elastic and moderately inelastic (restitution coefficient of 0.9) conditions. Data from both KT-TFM and DNS display a rich variety of statistically steady yet unstable structures (clusters). Instantaneous snapshots of KT-TFM and DNS demonstrate remarkable qualitative agreement. This qualitative agreement is quantified by calculating the critical density ratio at which the structure transitions from a chaotic, dynamic state to a regular, plug-flow state, with good overall comparisons. Further quantitative assessments of mean and fluctuating velocities show good agreement at high density ratios but weaker agreement at intermediate to low density ratios depending on the mean-flow Reynolds numbers and solid fractions. Deviations of the KT-TFM results from the DNS data were traced to a breakdown in one of the underlying assumptions of the kinetic theory derivation: high thermal Stokes number. Surprisingly, however, even though the low Knudsen number assumption, also associated with the kinetic theory derivation, is violated throughout most of the parameter space, it does not seem to affect the good quantitative accuracy of KT-TFM simulations.

Research Organization:
Univ. of Colorado, Boulder, CO (United States)
Sponsoring Organization:
USDOE Office of Fossil Energy (FE)
Grant/Contract Number:
FE0026298
OSTI ID:
1832979
Journal Information:
Journal of Fluid Mechanics, Journal Name: Journal of Fluid Mechanics Vol. 823; ISSN 0022-1120
Publisher:
Cambridge University PressCopyright Statement
Country of Publication:
United States
Language:
English

References (73)

Drag force of intermediate Reynolds number flow past mono- and bidisperse arrays of spheres journal January 2007
Filtered two-fluid models for fluidized gas-particle suspensions journal January 2008
Verification of filtered two-fluid models for gas-particle flows in risers journal December 2010
A functional subgrid drift velocity model for filtered drag prediction in dense fluidized bed journal May 2011
Fine-grid simulations of gas-solids flow in a circulating fluidized bed journal May 2012
Filtered and heterogeneity-based subgrid modifications for gas-solid drag and solid stresses in bubbling fluidized beds journal December 2013
A new drag correlation from fully resolved simulations of flow past monodisperse static arrays of spheres journal October 2014
Quantitative assessment of fine-grid kinetic-theory-based predictions of mean-slip in unbounded fluidization journal October 2015
A system-size independent validation of CFD-DEM for noncohesive particles: AIChE Letter: Particle Technology and Fluidization journal October 2015
Meso-scale statistical properties of gas-solid flow-a direct numerical simulation (DNS) study journal September 2016
An approach for drag correction based on the local heterogeneity for gas-solid flows journal October 2016
Gas-particle flow in a vertical pipe with particle-particle interactions journal September 1989
Computation of flow patterns in circulating fluidized beds journal June 1990
Velocity distributions in homogeneous granular fluids: the free and the heated case journal September 1998
Two- and Four-Way Coupled Euler–Lagrangian Large-Eddy Simulation of Turbulent Particle-Laden Channel Flow journal August 2008
Towards the ultimate conservative difference scheme. V. A second-order sequel to Godunov's method journal July 1979
A kinetic model for rapid granular flows of nearly elastic particles including interstitial fluid effects journal November 1988
Discrete particle simulation of two-dimensional fluidized bed journal October 1993
Momentum and heat transfer in two-phase bubble flow—I. Theory journal April 1981
Interaction between particle clusters and particle-induced turbulence journal October 2002
Numerical characterization and modeling of particle clustering in wall-bounded vertical risers journal June 2014
The effects of particle and gas properties on the fluidization of Geldart A particles journal August 2005
High-resolution Eulerian simulation of RMS of solid volume fraction fluctuation and particle clustering characteristics in a CFB riser journal July 2008
Why the two-fluid model fails to predict the bed expansion characteristics of Geldart A particles in gas-fluidized beds: A tentative answer journal February 2009
A fully coupled quadrature-based moment method for dilute to moderately dilute fluid–particle flows journal April 2010
Coarse grid simulation of bed expansion characteristics of industrial-scale gas–solid bubbling fluidized beds journal March 2010
Cluster characteristics of Geldart Group B particles in a pilot-scale CFB riser. I. Monodisperse systems journal January 2012
Micromechanical modeling and analysis of different flow regimes in gas fluidization journal December 2012
Effect of a cluster on gas–solid drag from lattice Boltzmann simulations journal October 2013
Structure-dependent drag in gas–solid flows studied with direct numerical simulation journal September 2014
A drag model for filtered Euler–Lagrange simulations of clustered gas–particle suspensions journal September 2014
A lattice-Boltzmann simulation study of the drag coefficient of clusters of spheres journal September 2006
Drag law for monodisperse gas–solid systems using particle-resolved direct numerical simulation of flow past fixed assemblies of spheres journal November 2011
Development of filtered Euler–Euler two-phase model for circulating fluidised bed: High resolution simulation, formulation and a priori analyses journal October 2013
Design principles for bounded higher-order convection schemes – a unified approach journal May 2007
A quadrature-based moment method for dilute fluid-particle flows journal February 2008
An Euler–Lagrange strategy for simulating particle-laden flows journal April 2013
Direct numerical simulation of particle–fluid systems by combining time-driven hard-sphere model and lattice Boltzmann method journal August 2010
Effects of using two- versus three-dimensional computational modeling of fluidized beds journal February 2008
Modeling of cluster structure-dependent drag with Eulerian approach for circulating fluidized beds journal March 2011
An assessment of the ability of computational fluid dynamic models to predict reactive gas–solid flows in a fluidized bed journal January 2012
Simulations of heat transfer to solid particles flowing through an array of heated tubes journal June 2016
The role of meso-scale structures in rapid gas–solid flows journal October 2001
Rheology of suspensions with high particle inertia and moderate fluid inertia journal April 2003
Direct numerical simulations of dense suspensions: wave instabilities in liquid-fluidized beds journal August 2007
Kinetic theories for granular flow: inelastic particles in Couette flow and slightly inelastic particles in a general flowfield journal March 1984
Particle pressure and marginal stability limits for a homogeneous monodisperse gas-fluidized bed: kinetic theory and numerical simulations journal December 1999
Enskog kinetic theory for monodisperse gas–solid flows journal September 2012
Impact of collisional versus viscous dissipation on flow instabilities in gas–solid systems journal June 2013
Kinetic-theory predictions of clustering instabilities in granular flows: beyond the small-Knudsen-number regime journal December 2013
On multiphase turbulence models for collisional fluid–particle flows journal February 2014
Sedimentation of a dilute suspension of rigid spheres at intermediate Galileo numbers: the effect of clustering upon the particle motion journal July 2014
On fluid–particle dynamics in fully developed cluster-induced turbulence journal September 2015
Lattice Boltzmann simulations of low-Reynolds-number flow past fluidized spheres: effect of Stokes number on drag force journal January 2016
Fluid Mechanical Description of Fluidized Beds. Stability of State of Uniform Fluidization journal February 1968
Multiscale Nature of Complex Fluid−Particle Systems journal October 2001
Effect of Clustering on Gas−Solid Drag in Dilute Two-Phase Flow journal June 2004
Lattice-Boltzmann Simulations of Particle-Fluid Suspensions journal January 2001
Equation of State for Nonattracting Rigid Spheres journal July 1969
Are continuum predictions of clustering chaotic? journal March 2017
Kinetic theory for a monodisperse gas–solid suspension journal October 1990
Inelastic microstructure in rapid granular flows of smooth disks journal January 1991
Particle clustering due to hydrodynamic interactions journal May 2000
Kinetic Theory of Granular Gases book July 2004
Clustering instability in dissipative gases journal March 1993
From Bubbles to Clusters in Fluidized Beds journal August 1998
Particle Induced Turbulence journal June 1994
Effect of Domain Size on Fluid–Particle Statistics in Homogeneous, Gravity-Driven, Cluster-Induced Turbulence journal December 2015
Particle-Resolved Direct Numerical Simulation for Gas-Solid Flow Model Development journal January 2014
The Clustering Instability in Rapid Granular and Gas-Solid Flows journal January 2017
Large-Eddy-Simulation Tools for Multiphase Flows journal January 2012
R APID G RANULAR F LOWS journal January 2003
I NSTABILITIES IN F LUIDIZED B EDS journal January 2003

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