Experimental and numerical investigation on the performance of a gas-solid cyclone with twisted baffles and roughened cone surface

Dehdarinejad, Ehsan; Bayareh, Morteza

doi:10.1016/j.powtec.2023.118401

Cited by 18 publications

(15 citation statements)

References 17 publications

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“…Several investigations have reported that this phenomenon results in efficient different particle separation. 49,57,86,158 In the investigated cyclones with one structure inlet, as shown in Figure 8, the tangential velocity distribution tends to be symmetric around the central vertical axis of St 1 , Sw 1 , and TL cyclones, which matches the literature. 159 The tangential velocity profile in the St 1 and TL cyclones extends to a lower region of the conic part, unlike the Sw 1 cyclone, indicating that particles will swirl in this region.…”

Section: Gas−particle Flow Pattern 421 Gas Flow Analysissupporting

confidence: 85%

“…The gas tangential velocity, in conjunction with the turbulent intensity, is considered an essential aerodynamic factor inside the cyclone, where various studies on different cyclone geometries highlighted their significance in separating particles from the gas phase. ,, As depicted in Figure , the tangential velocity profile is divided into two regions following the Rankine vortex, quasi-forced and free vortex zones, which produce two types of centrifugal force inside the cyclone, one due to the outer vortex downward the cyclone bottom and the other due to the inner vortex toward the cyclone outlet. ,, Consequently, these centrifugal acceleration generations control high-density particles to move near the wall region due to their high kinetic energy and the light particles in the central axis zone to escape through the vortex finder with the gas. Several investigations have reported that this phenomenon results in efficient different particle separation. ,,, …”

Section: Numerical Simulation Analysismentioning

confidence: 99%

“…At the same time, the outer vortex near the cyclone wall contains many solid particles moving toward the bottom of the cyclone. Thus, the axial velocity distribution has an essential impact on particle separation efficiency …”

Section: Numerical Simulation Analysismentioning

confidence: 99%

“…Thus, the axial velocity distribution has an essential impact on particle separation efficiency. 158 The pressure drop in a gas cyclone generates primarily from the energy dissipation of the swirling vortex, the flow rate, and the friction between the gas and the internal walls. 165 It is influenced significantly by various geometrical parameters of the cyclone, such as the inlet, cylindrical body, cone, outlet, and vortex finder.…”

Section: Gas−particle Flow Pattern 421 Gas Flow Analysismentioning

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: Gas−particle Flow Pattern 421 Gas Flow Analysissupporting

confidence: 85%

Section: Numerical Simulation Analysismentioning

confidence: 99%

Section: Numerical Simulation Analysismentioning

confidence: 99%

Section: Gas−particle Flow Pattern 421 Gas Flow Analysismentioning

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.

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“…In addition, the baffle can create zones of varying velocities by manipulating the flow dynamics, inducing the separation of different constituents within the fluid mixture. This principle is used in cyclone separators, where the baffle assists in particle separation from a gas or liquid stream (Dehdarinejad and Bayareh, 2023).…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of nanofluid buoyant flow behavior and heat transfer characteristics in annular-shaped enclosure with internal baffle

Reddy,

Yoon,

Mani

et al. 2023

HFF

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Purpose Natural convection in finite enclosures is a common phenomenon in various thermal applications. To provide the thermal design guidelines, this study aims to numerically explore the potential of using internal baffles and nanofluids to either enhance or suppress heat transport in a vertical annulus. Furthermore, the annular-shaped enclosure is filled with aqueous-silver nanofluid and the effects of five distinct nanoparticle shapes are examined. In addition, the influence of baffle design parameters, including baffle position, thickness and length, is thoroughly analyzed. Design/methodology/approach The finite difference method is used in conjunction with the alternating direction implicit and successive line over relaxation techniques to solve nonlinear and coupled partial differential equations. The single phase model is used for nanofluid which is considered as a homogeneous fluid with improved thermal properties. The independence tests are carried out for assessing the sufficiency of grid size and time step for obtaining results accurately. Findings The baffle dimension parameters and nanoparticle shape exhibit significant impact on the convective flow and heat transfer characteristics, leading to the following results: sphere- and blade-shaped nanoparticles demonstrate around 30% enhancement in the heat transport capability compared with platelet-shaped nanoparticles, which exhibit the least. When considering the baffle design parameter, either a decrease in the baffle length and thickness or an increase in baffle height leads to an improvement in heat transport rate. Consequently, a threefold increase in baffle height yields a 40% improvement in thermal performance. Originality/value Understanding the impact of nanoparticle shapes and baffle design parameters on flow and thermal behavior will enable engineers to provide valuable insight on thermal management and overall system efficiency. Therefore, the current work focuses on exploring buoyant nanofluid flow and thermal mechanism in a baffled annular-shaped enclosure. Specifically, an internal baffle that exhibits conductive heat transfer through it is considered, and the impact of baffle dimensions (thickness, length and position) on the fluid flow behavior and thermal characteristics is investigated. In addition, the current study also addresses the influence of five distinct nanoparticle shapes (e.g. spherical, cylindrical, platelet, blade and brick) on the flow and thermal behavior in the baffled annular geometry. In addition to deepening the understanding of nanofluid behavior in a baffled vertical annulus, the current study contributes to the ongoing advancements in thermal applications by providing certain guidelines to design application-specific enclosures.

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Eulerian–Lagrangian fluid dynamics study on the effects of inlet radial angle on the performance and flow pattern of multi-inlet cyclone separator

Fetuga,

Olakoyejo,

Abolarin

et al. 2023

Alexandria Engineering Journal

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Experimental and numerical investigation on the performance of a gas-solid cyclone with twisted baffles and roughened cone surface

Cited by 18 publications

References 17 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

Numerical investigation of nanofluid buoyant flow behavior and heat transfer characteristics in annular-shaped enclosure with internal baffle

Eulerian–Lagrangian fluid dynamics study on the effects of inlet radial angle on the performance and flow pattern of multi-inlet cyclone separator

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