True shape modeling of bio-particulate matter flow in an aero-cyclone separator using CFD–DEM simulation

El-Emam, Mahmoud A.; Zhou, Lian; Chen, Han

doi:10.1007/s40571-020-00383-w

Cited by 11 publications

(10 citation statements)

References 66 publications

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“…A designed cyclone from our previous study, Figure 6, was used for this purpose, which is simulated with the same framework conditions. 7,83 The comparison between the experimental and simulation results of the cyclone is shown in Figure 6, which qualitatively agrees with the trends reported in the literature and confirms our model's accuracy. 49 In addition, as shown in the figures mentioned in the Results section, the particles can reach their macroscopically steady state at the bottom of the cyclone after 2 s of simulation time, which is confidently consistent with the literature.…”

Section: Numerical Simulation Analysissupporting

confidence: 89%

“…As is known, cyclone performance, including separation efficiency, is one of the most critical output parameters for gas cyclones and is used as the significant parameter for the purpose of validation and reliability in this work. A designed cyclone from our previous study, Figure , was used for this purpose, which is simulated with the same framework conditions. , The comparison between the experimental and simulation results of the cyclone is shown in Figure , which qualitatively agrees with the trends reported in the literature and confirms our model’s accuracy . In addition, as shown in the figures mentioned in the Results section, the particles can reach their macroscopically steady state at the bottom of the cyclone after 2 s of simulation time, which is confidently consistent with the literature. , However, slight deviations, which are in the accepted limits of 1.26, 1.94, and 5%, were observed in separation and cleaning efficiencies and effectiveness, resulting from the assumptions of the simulation methodology.…”

Section: Numerical Simulation Analysissupporting

confidence: 86%

“…5 The industrial cyclone separator is designed with a reverse flow, consisting of a cylindrical and conical body made of metal and an inlet and outlet for the gas or air stream, as shown in Figure 1 centrifugal forces, the heavier solid or liquid particles are thrown toward the cylinder walls, where they collect and are removed, while the light particles with the air stream escape from the tube at the top surface of the cyclone. 2,6,7 Most of the cyclone dimensions are typically expressed as ratios to the cyclone diameter (D), allowing for the straightforward development of such standard designs, including 1D3D, 8 2D2D, 9 and 1D2D, 10 where each number before (D) refers to the length of the cylindrical and conical sections. Experimental and primitive numerical studies have been investigated to overview the flow field inside these standard cyclones.…”

Section: Introductionmentioning

confidence: 99%

“…The gas or air stream enters the separator tangentially at the top of the body, creating a swirling motion inside the cylinder. Due to centrifugal forces, the heavier solid or liquid particles are thrown toward the cylinder walls, where they collect and are removed, while the light particles with the air stream escape from the tube at the top surface of the cyclone. ,, …”

Section: Introductionmentioning

confidence: 99%

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Modeling and Performance Analysis of Different Gas–Bioparticle Cyclone Separators: CFD–DEM Simulations

El-Emam,

Zhou,

Bai

et al. 2023

Ind. Eng. Chem. Res.

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This research presents a comprehensive study aimed at investigating the influence of different cyclone geometries on the flow field and performance in gas−bioparticle flows. Five distinct cyclone designs, including Stairmand high-efficiency (St 1 ), Stairmand high-flow (St 2 ), Swift high-efficiency (Sw 1 ), Swift highflow (Sw 2 ), and typical Lapple (TL), were involved. The investigation utilized a combination of computational fluid dynamics (CFD) and the discrete element method (DEM) to model the gas−particle behavior. The DEM accounted for the motion of individual particles using Newton's equations, while the CFD solved the Navier−Stokes equations to model the gas flow as a continuous medium. This numerical model successfully simulated the cyclone performance under three-dimensional (3D) true shape modeling of large-sized nonspherical bioparticles considering the particle−particle and particle−wall interaction forces. The experimental validation and verification of the model demonstrated an acceptable agreement with the simulated data. The findings revealed that cyclone dimensions significantly impacted both performance and particle behavior even when operating under identical conditions. Cyclones with matching dimensions between the bottom and vortex finder exhibited improved separation efficiency, while an increase in the vortex finder's diameter led to decreased efficiency, as in St 2 and Sw 2 cyclones. A comprehensive force analysis pinpointed regions of intense particle−wall collisions, predominantly at the cone wall apex and the wall opposite the cyclone inlet, particularly evident in St 1 , Sw 1 , and TL cyclones. Notably, particle−particle interaction forces played a crucial role in cyclone performance with increased separation efficiency observed due to particle collisions. The particle−gas forces, including drag and pressure gradient forces, were mainly affected in the inlet region and extended into the cylindrical part. The pressure gradient force exhibited a minimal impact on particle behavior. Among the cyclone designs tested, the Sw 1 cyclone demonstrated outstanding performance, achieving an impressive effectiveness of 94.4% under the given operational conditions. These findings provide a better understanding of the working mechanisms of gas−particle cyclones and similar swirling multiphase flow systems, allowing for improved optimization.

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Section: Numerical Simulation Analysissupporting

confidence: 89%

Section: Numerical Simulation Analysissupporting

confidence: 86%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Modeling and Performance Analysis of Different Gas–Bioparticle Cyclone Separators: CFD–DEM Simulations

El-Emam,

Zhou,

Bai

et al. 2023

Ind. Eng. Chem. Res.

Self Cite

View full text Add to dashboard Cite

show abstract

“…It can also calculate the interaction force between fluid and particles through coupling with a fluent fluid. The motion distribution of particles can be clearly viewed through postprocessing, which is more comprehensive than the traditional simulation model [14]. Petit et al used the CFD-DEM coupling method to study the particle movement behavior of air classifiers and improved the separation performance [15].…”

Section: Introductionmentioning

confidence: 99%

Simulation and Experiment of Gas-Solid Flow in a Safflower Sorting Device Based on the CFD-DEM Coupling Method

Hai-feng

et al. 2021

Processes

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To study the movement characteristics and separation mechanism of safflower petals and their impurities under the action of airflow and lower the impurity rate in the cleaning operation process, integration of computational fluid dynamics (CFD) and discrete element method (DEM) codes was performed to study the motion and sorting behavior of impurity particles and safflower petals under different airflow inclination angles, dust removal angles and inlet airflow velocities by establishing a true particle model. In this model, the discrete particle phase was applied by the DEM software, and the continuum gas phase was described by the ANSYS Fluent software. The Box-Behnken experimental design with three factors and three levels was performed, and parameters such as inlet airflow velocity, airflow inclined angle, and dust remover angle were selected as independent variables that would influence the cleaning impurity rate and the cleaning loss rate. A mathematical model was established, and then the effects of various parameters and their interactions were analyzed. The test results show that the cleaning effect is best when the inlet airflow velocity is 7 m/s, the airflow inclined angle is 0°, and the dust remover angle is 25°. Confirmatory tests showed that the average cleaning impurity rate and cleaning loss rate were 0.69% and 2.75%, respectively, which dropped significantly compared with those from previous optimization. An experimental device was designed and set up; the experimental results were consistent with the simulation results, indicating that studying the physical behavior of safflower petals-impurity separation in the airflow field by using the DEM-CFD coupling method is reliable. This result provides a basis for follow-up studies of separation and cleaning devices for lightweight materials such as safflower petals.

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Numerical Investigation of Cyclone Separators: Physical Mechanisms and Theoretical Algorithms

El‐Emam,

Zhou,

Yasser

2024

ChemBioEng Reviews

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Gas‐particle aero‐type cyclones have revolutionized biochemical processes, engineering industries, and environmental pollution protection by effectively separating particles from gas. These devices rely on gravitational energy and centrifugal force to dissipate particle phase energy, but achieving optimal energy efficiency while minimizing pressure drop remains challenging. This has led to the development of various cyclone designs in commercial industries, each with unique energy efficiency characteristics. The intricate gas‐particle flow inside cyclones is a critical issue impacted by cyclone geometry, operating conditions, and media parameters. Advanced numerical simulations have been employed to understand this complex flow pattern better, offering researchers valuable insights into the mechanisms of different cyclone separators. This comprehensive review explores the available numerical methods in the literature on cyclones and their corresponding validations. Computational numerical modeling is a promising technique for predicting cyclone energy efficiency, gas‐particle behavior, and overall performance. This investigation delves into the progress and numerical forms of gas‐particle flow cyclones, examining how different parameters impact cyclone performance and flow patterns within the two‐phase flow. The future developments and challenges that may further promote the development of aero‐type cyclone separators, providing theory and engineering support for future cyclone designs, are also covered. As a result, it can confidently be reported that aero‐type cyclone separators remain a critical component in various industrial sectors, offering energy‐efficient solutions for mitigating environmental pollutants and gas‐particle separation systems. With continued development and research, these devices will undoubtedly shape the future of energy processes and engineering industries, ushering in a new era of sustainability and efficiency.

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True shape modeling of bio-particulate matter flow in an aero-cyclone separator using CFD–DEM simulation

Cited by 11 publications

References 66 publications

Modeling and Performance Analysis of Different Gas–Bioparticle Cyclone Separators: CFD–DEM Simulations

Modeling and Performance Analysis of Different Gas–Bioparticle Cyclone Separators: CFD–DEM Simulations

Simulation and Experiment of Gas-Solid Flow in a Safflower Sorting Device Based on the CFD-DEM Coupling Method

Numerical Investigation of Cyclone Separators: Physical Mechanisms and Theoretical Algorithms

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