CFD-DEM investigation of the fluidization of binary mixtures containing rod-like particles and spherical particles in a fluidized bed

2018 ◽  
Vol 336 ◽  
pp. 533-545 ◽  
Author(s):  
Huaqing Ma ◽  
Yongzhi Zhao
Keyword(s):  
Fluidized Bed ◽  
Binary Mixtures ◽  
Spherical Particles

scholarly journals Non-spherical particle mixing behaviors by spherical inert particles assisted in a fluidized bed

2019 ◽  
Vol 17 (2) ◽  
pp. 509-524 ◽  
Author(s):  
An-Xing Ren ◽  
Tian-Yu Wang ◽  
Tian-Qi Tang ◽  
Yu-Rong He
Keyword(s):  
Fluidized Bed ◽  
Binary Mixtures ◽  
Volume Fraction ◽  
Fluid Dynamic ◽  
Rolling Friction ◽  
Spherical Particles ◽  
Industrial Processes ◽  
Vertical Orientation ◽  
Inert Particles ◽  
Particle Velocities

AbstractFluidized beds are widely used in many industrial fields such as petroleum, chemical and energy. In actual industrial processes, spherical inert particles are typically added to the fluidized bed to promote fluidization of non-spherical particles. Understanding mixing behaviors of binary mixtures in a fluidized bed has specific significance for the design and optimization of related industrial processes. In this study, the computational fluid dynamic–discrete element method with the consideration of rolling friction was applied to evaluate the mixing behaviors of binary mixtures comprising spherocylindrical particles and spherical particles in a fluidized bed. The simulation results indicate that the differences between rotational particle velocities were higher than those of translational particle velocities for spherical and non-spherical particles when well mixed. Moreover, as the volume fraction of the spherocylindrical particles increases, translational and rotational granular temperatures gradually increase. In addition, the addition of the spherical particles makes the spherocylindrical particles preferably distributed in a vertical orientation.

Effect of Fluidized Bed on Permeate Flux in Ceramic Membrane Cross-Flow Microfiltration

1995 ◽  
Vol 60 (12) ◽  
pp. 2074-2084
Author(s):  
Petr Mikulášek
Keyword(s):  
Fluidized Bed ◽  
Ceramic Membrane ◽  
Cross Flow ◽  
Experimental System ◽  
Experimental Results ◽  
Spherical Particles ◽  
Permeate Flux ◽  
Model Fluid ◽  
Optimum Porosity ◽  
Tubular Membranes

The microfiltration of a model fluid on an α-alumina microfiltration tubular membrane in the presence of a fluidized bed has been examined. Following the description of the basic characteristic of alumina tubular membranes, model dispersion and spherical particles used, some comments on the experimental system and experimental results for different microfiltration systems are presented. From the analysis of experimental results it may be concluded that the use of turbulence-promoting agents resulted in a significant increase of permeate flux through the membrane. It was found out that the optimum porosity of fluidized bed for which the maximum values of permeate flux were reached is approximately 0.8.

CFD‐DEM analysis of the spouted fluidized bed with non‐spherical particles

2021 ◽  
Author(s):  
Behrad Esgandari ◽  
Shahab Golshan ◽  
Reza Zarghami ◽  
Rahmat Sotudeh‐Gharebagh ◽  
Jamal Chaouki
Keyword(s):  
Fluidized Bed ◽  
Spherical Particles ◽  
Dem Analysis

Mixing and segregation of binary mixtures of biomass and silica sand in a fluidized bed

Particuology ◽  
2021 ◽  
Author(s):  
Tolu Emiola-Sadiq ◽  
Jiachen Wang ◽  
Lifeng Zhang ◽  
Ajay Dalai
Keyword(s):  
Fluidized Bed ◽  
Binary Mixtures ◽  
Silica Sand

Characteristics of Pressure Fluctuations in a Fluidized Bed of Binary Mixtures

2005 ◽  
Vol 38 (12) ◽  
pp. 960-968 ◽  
Author(s):  
Zhanyong Li ◽  
Noriyuki Kobayashi ◽  
Masanobu Hasatani
Keyword(s):  
Fluidized Bed ◽  
Binary Mixtures ◽  
Pressure Fluctuations

scholarly journals Experimental and Theoretical Study of the Axial Distribution of Solid Phase Particles in a Fluidized Bed

2021 ◽  
Vol 64 (4) ◽  
pp. 349-362
Author(s):  
A. V. Mitrofanov ◽  
V. E. Mizonov ◽  
N. S. Shpeynova ◽  
S. V. Vasilevich ◽  
N. K. Kasatkina
Keyword(s):  
Fluidized Bed ◽  
Field Experiments ◽  
Solid Phase ◽  
Cell Model ◽  
Experimental Studies ◽  
Parametric Identification ◽  
Resistance Coefficient ◽  
Model Material ◽  
Spherical Particles ◽  
Axial Distribution

The article presents the results of computational and experimental studies of the distribution of a model material (plastic spherical particles with a size of 6 mm) along the height of a laboratory two-dimensional apparatus of the fluidized bed of the periodic principle of action. To experimentally determine the distribution of the solid phase over the height of the apparatus, digital photographs of the fluidized bed were taken, which were then analyzed using an algorithm that had been specially developed for this purpose. The algorithm involved splitting the image by height into separate rectangular areas, identifying the particles and counting their number in each of these areas. Numerical experiments were performed using the previously proposed one-dimensional cell model of the fluidization process, constructed on the basis of the mathematical apparatus of the theory of Markov chains with discrete space and time. The design scheme of the model assumes the spatial decomposition of the layer in height into individual elements of small finite sizes. Thus, the numerically obtained results qualitatively corresponded to the full-scale field experiment that had been set up. To ensure the quantitative reliability of the calculated forecasts, a parametric identification of the model was performed using known empirical dependencies to calculate the particle resistance coefficient and estimate the coefficient of their macrodiffusion. A comparison of the results of numerical and field experiments made us possible to identify the most productive empirical dependencies that correspond to the cellular scheme of modeling the process. The resulting physical and mathematical model has a high predictive efficiency and can be used for engineering calculations of devices with a fluidized bed, as well as for setting and solving problems of optimal control of technological processes in these devices for various target functions.

Crowding effects in binary mixtures of rod-like and spherical particles

2004 ◽  
Vol 17 (5) ◽  
pp. 417-425 ◽  
Author(s):  
S. Lago ◽  
A. Cuetos ◽  
B. Martínez-Haya ◽  
L. F. Rull
Keyword(s):  
Binary Mixtures ◽  
Spherical Particles ◽  
Crowding Effects

DEM investigation of shear flows of binary mixtures of non-spherical particles

2019 ◽  
Vol 202 ◽  
pp. 383-391 ◽  
Author(s):  
Jiecheng Yang ◽  
Yu Guo ◽  
Kevin E. Buettner ◽  
Jennifer S. Curtis
Keyword(s):  
Binary Mixtures ◽  
Shear Flows ◽  
Spherical Particles

Mixing and segregation behavior in an air dense medium fluidized bed with binary mixtures for dry coal beneficiation

2020 ◽  
Vol 371 ◽  
pp. 161-169 ◽  
Author(s):  
Zhijie Fu ◽  
Jesse Zhu ◽  
Shahzad Barghi ◽  
Yuemin Zhao ◽  
Zhenfu Luo ◽  
...  
Keyword(s):  
Fluidized Bed ◽  
Binary Mixtures ◽  
Dense Medium ◽  
Segregation Behavior ◽  
Coal Beneficiation
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