Particle scale study of heat transfer in packed and fluidized beds of ellipsoidal particles

Gan, Jieqing; Zhou, Zongyan; Yu, Aibing

doi:10.1016/j.ces.2016.01.041

Cited by 89 publications

(18 citation statements)

References 70 publications

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“…For the latter, Zhu et al (2008) summarized the major applications of DEM in particulate systems, including particle packing, particle flow, particle-fluid flow and granular dynamics. It should be noted that Gan et al (2016) successfully applied the computational fluid dynamics-discrete element method (CFD-DEM) to the heat transfer study of the ellipsoid particles in the packed bed, and confirmed the advantages of the coupling method at the particle-scale. Therefore, the CFD-DEM was adopted in this paper.…”

Section: Introductionmentioning

confidence: 67%

Experimental and Numerical Investigation of Particle Flow and Mixing Characteristics in an Internally Circulating Fluidized Bed

Wang

Wei

Jiang

et al. 2019

J. Chem. Eng. Japan / JCEJ

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The mechanism of solids mixing is considered as a vital factor to the metal smelting, catalytic cracking and combustion performance in the multi-particle eld. In this paper, the computational uid dynamics coupling discrete element method (CFD-DEM) approach was employed to simulate the binary particles movement and mixing within a ba e type internal circulating uidized bed (ICFB). Moreover, the mixing behaviors of binary particles were experimentally validated in the macroscopic scale. Polyethylene particles were used as bed material, and glass beads and rubber particles were chosen as tracers. The above two research methods are to add tracer particles after achieving the circulating movement of polyethylene particles around the vertical plate. The mixing behaviors were investigated in terms of ow patterns, solid circulating mass ux, and mixing index. Moreover, the e ect of inlet gas velocity ratio on mixing also conducted in the current research. The results indicate that there is an optimal velocity value of fast and low inlet gas velocity to achieve the solid circulation mass ux. The particle density has a signi cant in uence on the mixing degree and rate of the binary particles. Besides, from the simulation of the e ect of four groups of inlet gas velocity on mixing index with glass beads as tracer particles, it is found that more particles can be entrained into the cycle mixing movement with the increasing gas velocity. These ndings could be helpful for the design and optimization of the novel uidized reactors.

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Section: Introductionmentioning

confidence: 67%

Experimental and Numerical Investigation of Particle Flow and Mixing Characteristics in an Internally Circulating Fluidized Bed

Wang

Wei

Jiang

et al. 2019

J. Chem. Eng. Japan / JCEJ

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show abstract

“…and Nikrityuk conducted three-dimensional numerical simulations [33,34] but a systematic study on the difference between oblate and prolate spheroids has not been done. This may be among the reasons why Gan et al [37] adopted the correlation proposed from two-dimensional simulations to investigate the heat transfer in three-dimensional packed and fluidized beds of ellipsoidal particles.…”

Section: Motivation and Summary Of The Present Workmentioning

confidence: 99%

On the drag coefficient and averaged Nusselt number of an ellipsoidal particle in a fluid

Shu

Zhang

et al. 2018

Powder Technology

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The paper aims to improve existing correlations for the drag coefficient and averaged Nusselt number of an ellipsoidal particle in a fluid by additionally considering its orientation. To do so, three dimensional Immersed Boundary-Lattice Boltzmman Method (IB-LBM) simulations were carried out on a classical problem where a hot stationary ellipsoidal particle was passed by continuous cold fluid flows. By changing the shape (0.25 ≤ Ar ≤ 2.5) and incident angle (0 • ≤ θ ≤ 90 •) of the solid particle as well as the Reynolds number (10 ≤ Re ≤ 200), the momentum and heat transfer between the solid and fluid phases was quantitatively evaluated and the drag coefficient and averaged Nusselt number were numerically quantified. Then, based on the obtained data, correlations for the drag coefficient and averaged Nusselt number were established by considering Ar, θ and Re as the key influencing factors. Proposed correlations were proven to hold promising prediction capabilities and would be useful to be enclosed in those complex multiphase coupling calculations.

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“…Rickelt et al [25,26] developed a radial temperature model that allows to simulate granular systems of particles of different sizes and materials, enabling the use of DEM in various applications. Gan et al [11] extended DEM to simulate contact heat transfer in packed and fluidized beds of ellipsoids. However, the above methods are restricted to the analysis of simple-shaped particles (spheres, discs, cylinders, ellipsoids, etc.)…”

Section: Introductionmentioning

confidence: 99%

Capturing heat transfer for complex-shaped multibody contact problems, a new FDEM approach

et al. 2020

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This paper presents a new approach for the modelling of heat transfer in 3D discrete particle systems. Using a combined finite-discrete element (FDEM) method, the surface of contact is numerically computed when two discrete meshes of two solids experience a small overlap. Incoming heat flux and heat conduction inside and between solid bodies are linked. In traditional FEM (finite element method) or DEM (discrete element method) approaches, to model heat transfer across contacting bodies, the surface of contact is not directly reconstructed. The approach adopted here uses the number of surface elements from the penetrating boundary meshes to form a polygon of the intersection, resulting in a significant decrease in the mesh dependency of the method. Moreover, this new method is suitable for any sizes or shapes making up the particle system, and heat distribution across particles is an inherent feature of the model. This FDEM approach is validated against two models: a FEM model and a DEM pipe network model. In addition, a multi-particle heat transfer contact problem of complex-shaped particles is presented.

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Particle scale study of heat transfer in packed and fluidized beds of ellipsoidal particles

Cited by 89 publications

References 70 publications

Experimental and Numerical Investigation of Particle Flow and Mixing Characteristics in an Internally Circulating Fluidized Bed

Experimental and Numerical Investigation of Particle Flow and Mixing Characteristics in an Internally Circulating Fluidized Bed

On the drag coefficient and averaged Nusselt number of an ellipsoidal particle in a fluid

Capturing heat transfer for complex-shaped multibody contact problems, a new FDEM approach

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