Fluidization of 1204 spheres: simulation and experiment

Pan, Tsorng‐Whay; Joseph, Daniel D.; Bai, R.; Glowinski, Roland; Sarin, Vivek

doi:10.1017/s0022112001006474

Cited by 147 publications

(78 citation statements)

References 39 publications

(46 reference statements)

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“…The detailed results from the DNS have been proved to be useful in extracting constitutive equations and closure laws that can be employed in DEM or TFM. Pan et al (2002) conducted a DNS of the fluidization of 1204 spherical particles. They were able to successfully simulate the experiment and reproduce the celebrated correlations of Richardson and Zaki (1954), which account for the concentration of particles in the sedimentation process.…”

Section: Executive Summarymentioning

confidence: 99%

Use of an Accurate DNS Particulate Flow Method to Supply and Validate Boundary Conditions for the MFIX Code

Zhao¹

2012

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The simulation of particulate flows for industrial applications often requires the use of two-fluid models, where the solid particles are considered as a separate continuous phase. One of the underlining uncertainties in the use of the two-fluid models in multiphase computations comes from the boundary condition of the solid phase. Typically, the gas or liquid fluid boundary condition at a solid wall is the so called no-slip condition, which has been widely accepted to be valid for single-phase fluid dynamics provided that the Knudsen number is low. However, the boundary condition for the solid phase is not well understood. The no-slip condition at a solid boundary is not a valid assumption for the solid phase. Instead, several researchers advocate a slip condition as a more appropriate boundary condition. However, the question on the selection of an exact slip length or a slip velocity coefficient is still unanswered. Experimental or numerical simulation data are needed in order to determinate the slip boundary condition that is applicable to a two-fluid model.The goal of this project is to improve the performance and accuracy of the boundary conditions used in two-fluid models such as the MFIX code, which is frequently used in multiphase flow simulations. The specific objectives of the project are to use first principles embedded in a validated Direct Numerical Simulation particulate flow numerical program, which uses the Immersed Boundary method (DNS-IB) and the Direct Forcing scheme in order to establish, modify and validate needed energy and momentum boundary conditions for the MFIX code. To achieve these objectives, we have developed a highly efficient DNS code and conducted numerical simulations to investigate the particle-wall and particle-particle interactions in particulate flows. Most of our research findings have been reported in major conferences and archived journals, which are listed in Section 7 of this report. In this report, we will present a brief description of these results.

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Section: Executive Summarymentioning

confidence: 99%

Use of an Accurate DNS Particulate Flow Method to Supply and Validate Boundary Conditions for the MFIX Code

Zhao¹

2012

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“…(12), the difference in density between the particle, These arguments have been applied in existing fluidized bed models 10 , but due to the size of the particles (~4 mm) in relation to the fluidized bed diameter (~26 mm), common multiphase flow models could not be applied. Volume averaging techniques 10 would call for a very coarse fluid grid, while a DNS model 11 would be computationally very expensive. A pseudo 1-D Lagrangian model was proposed, which computes the void fraction within a certain area of interest around the particle.…”

Section: Iiib Solid -Gas Flow Modelmentioning

confidence: 99%

Numerical and Experimental Analysis of a Fluidized Bed for IFE Target Layering

Boehm

Raffray

Alexander

et al. 2009

Fusion Science and Technology

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“…The Lagrange multiplier (physically a pseudo body force) is introduced to enforce the interior (fictitious) fluids to satisfy the constraint of rigid body motion, much like the pressure in incompressible fluid flow whose gradient is the force required to maintain the constraint of incompressibility. The method was used to investigate the sedimentation of 6400 disks settling down in a rectangular cavity and the fluidization of 1204 nylon spheres in a slit bed (Pan et al, 2002).…”

Section: Other Approachesmentioning

confidence: 99%