CFD simulation and experimental validation of tortuosity effects on pellet-fluid heat transfer of regularly stacked multi-lobe particles

Zare, M.; Hashemabadi, Seyed Hassan

doi:10.1016/j.cej.2018.10.188

Cited by 12 publications

(3 citation statements)

References 69 publications

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“…A reliable experimental method was previously developed by our group to validate the CFD simulation 42–46, 85, 86. A benchmark experimental setup was employed to study naphthalene sublimation from the particle surface (see Supporting Information, Sect.…”

Section: Experimental and Modelingmentioning

confidence: 99%

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Heat Transfer at a Particle‐Tube Wall Contact Point: Impact of Catalyst Configuration on Hot Spots

2021

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Hot spots tend to cause serious problems owing to probable damages to the reactor wall in intense endothermic reactions leading to safety concerns and enormous repairing costs. The heat transfer of a single cylindrical particle is studied empirically and numerically to evaluate hot spot creation close to the bed wall. Computational fluid dynamcis (CFD) methodology is used to solve the momentum, continuity, and energy equations simultaneously. The newly developed experimental method is applied to validate simulation data using the Chilton‐Colburn analogy. The particle rotation over the X, Y, and Z axes is studied and analysis of variance (ANOVA) is employed to statistically investigate the particle rotation effects on the dimensionless maximum temperature of the reactor wall.

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Section: Experimental and Modelingmentioning

confidence: 99%

“…Hashemabadi et al studied the particle‐fluid heat transfer within a PBR containing naphthalene‐coated particles considering wall effects based on various studies 42–46. They used heat and mass transfer analogy to validate the CFD simulations with measured experimental data.…”

Section: Introductionmentioning

confidence: 99%

Heat Transfer at a Particle‐Tube Wall Contact Point: Impact of Catalyst Configuration on Hot Spots

2021

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“…There are also path-finding methods directly using the streamlines from the results of CFD simulation. 19,20 The third method uses either voxel or mesh-based simulation on a real 3D microstructure. The voxel-based method can use 2D images only with sufficient resolution to solve diffusion equations through a porous medium.…”

mentioning

confidence: 99%

Analysing Tortuosity for Solid Oxide Fuel Cell Anode Material: Experiments and Modeling

Zhang,

Yang,

et al. 2023

J. Electrochem. Soc.

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Solid oxide fuel cells (SOFCs) directly convert chemical energy to electricity with high electrical efficiency. It involves gas transport through the porous electrode to the three-phase boundaries (TPB). The tortuosity of gas transport relates the bulk diffusion of gas in free space to the effective diffusion coefficient of gas migrating through a porous material. Therefore, determining the tortuosity is of great importance. This paper tests button SOFCs with NiO-YSZ as anode material followed by dual beam-focused ion beam scanning electron microscopy (FIB-SEM) to obtain 2D serial slice images. Based on processed 2D images and reconstructed 3D microstructure, the tortuosity is calculated using three approaches i.e., porosity-tortuosity correlations, voxel-based, and path-length-based approaches. The test results show that a decrease in Ni content in the anode greatly decreases the cell performance due to a decreased percolated electronic phase. The sample with low performance has high tortuosity. Different approaches vary regarding the tortuosity value and computational time. The path-length-based approach can achieve reasonable accuracy in a relatively short time but is only valid for using the longest path length.

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Laminar Fluid Mixing in Micromixers: Description of Pull‐Push Effects

2021

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A numerical study was performed on laminar mixing of fluids by means of embedded microbarriers against the flow direction in two three-dimensional T-micromixers. Two microchannels with different obstacle arrangements were considered, and the effect of volumetric flow rate Q on two-stream pull-push motion was investigated. With increasing Q and distance of the barriers to the sidewalls K, different vortices and fluid movement patterns develop in the two micromixers. Maximum mass transfer is obtained for the micromixer with smaller K value. With decreasing K, pull-push movement strongly affects fluid merging, and the quality of mixing increases. Moreover, the effect of fluid tortuosity was studied, and a direct relationship between hydrodynamic fluid tortuosity and mass transfer was found.

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CFD simulation and experimental validation of tortuosity effects on pellet-fluid heat transfer of regularly stacked multi-lobe particles

Cited by 12 publications

References 69 publications

Heat Transfer at a Particle‐Tube Wall Contact Point: Impact of Catalyst Configuration on Hot Spots

Heat Transfer at a Particle‐Tube Wall Contact Point: Impact of Catalyst Configuration on Hot Spots

Analysing Tortuosity for Solid Oxide Fuel Cell Anode Material: Experiments and Modeling

Laminar Fluid Mixing in Micromixers: Description of Pull‐Push Effects

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