Separation Efficiency of a Cyclone Separator with a Turbulence-Suppressing Rotating-Insert

Razgaitis, R.; Guenther, Dennis A.

doi:10.1115/1.3230768

Cited by 10 publications

(2 citation statements)

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“…During the simulations, the fan was removed, and only the effect of its flow was set. The most important economic parameter of the cyclone separator is the separation efficiency, which can be defined as an indicator of particle removal from the granular flow stream through vortex separation [86]. In this context, the primary scope of this paper is to predict the cyclone's separating efficiency for jojoba seeds and its leaves.…”

Section: Model Validationmentioning

confidence: 99%

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

2021

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The multi-phase flow of air and bio-particulate matter exists in many biological and environmental systems such as aerodynamic separating devices, fluidized bed combustion, and feed processing machinery. Integration of the computational fluid dynamics (CFD) and discrete element method (DEM) codes was performed to study bio-particle loading ratios' effect on the cyclone device performance. Every individual particle's behavior was captured by a DEM model using Newton's equations of motion, in which CFD modeled the continuum airflow for every computational cell scale through the Navier-Stokes equation. According to the high turbulence and chaotic behavior of the continuum airflow inside the cyclone separator, Reynolds stress turbulence model (RSM) was used. The particles used for testing and modeling were conducted on two mixture types of real-heterogeneous particulate matter, namely jojoba seeds and jojoba leaves, without any fly ash. The particles were geometrically modeled using their actual dimensions and shapes, considered the first head start research approach in the cyclonic separation and purification field. The influence of the interacting particle-particle and particle-boundary forces was taken into consideration. The numerical simulation results successfully predicted the cyclone performance at the designed conditions, which showed the best experimental data trend. These data are useful in future studies to modify the cyclone design and optimize bio-systems' operating conditions for separating the macroscopic particulate matter. Keywords Air-particle flow • Cyclonic separation • Computational fluid dynamics • Discrete element method List of symbols C d Drag coefficient C ij Fluid convection ds n Change in normal overlap at current time, s d v Spherical particle diameter, m d p Particle diameter, m D Domain diameter, m

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Section: Model Validationmentioning

confidence: 99%

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

2021

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“…Accordingly, based on the experimental work and the particles’ physical properties, the feed particle mass loading is approximately 0.98 kg particle /kg gas , indicating a dilute flow. The cyclone performance, including separation (η s ) and cleaning (η c ) efficiencies and effectiveness (η), is calculated using eqs –. − Physical experiments have also been conducted to validate the numerical model, which is the same as in our previous work . In such an experiment, the air was blown into the cyclone inlet, with the flow rate measured by a flowmeter.…”

Section: Physical Model and Numerical Methodsmentioning

confidence: 99%

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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Zyklonabscheider – Ein Heißgas‐reinigungsverfahren

Gottschalk¹,

Morweiser²

1998

Chemie Ingenieur Technik

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Separation Efficiency of a Cyclone Separator with a Turbulence-Suppressing Rotating-Insert

Cited by 10 publications

References 0 publications

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

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

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

Zyklonabscheider – Ein Heißgas‐reinigungsverfahren

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