Experimental and numerical study of Stairmand cyclone separators: a comparison of the results of small-scale and large-scale cyclones

Erol, Halil I.; Turgut, Oğuz; Ünal, Rahmi

doi:10.1007/s00231-019-02589-y

Cited by 32 publications

(14 citation statements)

References 28 publications

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“…Table 2 presents the 50% cut sizes for square cyclones with different inlet shapes for five different inlet velocities. From this Table 3, it was concluded that the 50% cut size reduced by any increase in inlet velocity [8,32]. The tangential velocity increases as the inlet velocity increases.…”

Section: Effect Of Inlet Section On 50% Cut Sizementioning

confidence: 90%

“…The Eulerian-Lagrangian method was used to apply the discrete phase model (DPM) [28] where the solid and fluid phases were treated as discrete and continuous phases, respectively. As the discrete phase in DPM occupied a low volume fraction, a one-way coupling method was implemented between two phases, and the particle-particle interactions were not considered [32]. The drag coefficient…”

Section: Governing Equationsmentioning

confidence: 99%

“…Figure 12 illustrates the pressure drop (Pa) values as a function of inlet velocity for the square cyclone with straight inlet, inclined inlet, and bend inlet. It was observed that the pressure drop slightly increased with an increase in inlet velocity [8,32].…”

Section: Effect Of Inlet Section On Pressure Dropmentioning

confidence: 99%

“…The particle size for which separation efficiency is 50% is expressed as the 50% cut size [32]. Table 2 presents the 50% cut sizes for square cyclones with different inlet shapes for five different inlet velocities.…”

Section: Effect Of Inlet Section On 50% Cut Sizementioning

confidence: 99%

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Performance assessment of a square cyclone influenced by inlet section modifications

Hosseini

2020

J Braz. Soc. Mech. Sci. Eng.

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The main objective of the present study was to analyze the effect of varying the inlet shape on the flow field and overall performance in a square cyclone. Three different inlet shapes, namely straight, inclined, and bend inlets, were specifically proposed to improve the low separation efficiency of the square cyclone. A three-dimensional numerical simulation was done by solving the Reynolds averaged Navier-Stokes equations with the Reynolds stress model turbulence model and applying the Eulerian-Lagrangian two-phase method. The turbulent dispersion of particles was predicted by the application of the discrete random walk model. Comprehensive comparisons of pressure drop, separation efficiency, 50% cut sizes, and flow field were performed to demonstrate the mechanism of how the inlet shape influenced the square cyclone performance. The results extracted from computational fluid dynamics simulation demonstrated that although using inclined and bend inlets produced an increase in pressure drop, they positively enhanced the separation efficiency of the square cyclone. Among all inlet shapes, inclined inlet significantly helped the square cyclone to collect finer particles, as it reduced the 50% cut sizes approximately 29.4% at an inlet velocity of 28 m/s. Keywords Square cyclone • Inlet shape • Separation efficiency • Eulerian-Lagrangian • Computational fluid dynamics (CFD) Abbreviations C D Drag coefficient ν Gas kinematic viscosity (m 2 /s) K Fluctuating kinetic energy (m 2 /s 2) u i Gas velocity in i-direction (m/s) g i Gravitational acceleration in i-direction (m/s 2) P f Fluctuating energy production (m 2 /s 3) μ Gas dynamic viscosity (kg/ms) ρ Gas density (kg/m 3) ρ p Particle density (kg/m 3) R ij Reynolds stress tensor u pi Particle velocity in i direction (m/s) ε Turbulence dissipation rate (m 2 /s 3) v Velocity (m/s) d p Particle diameter (μm) Re p Relative Reynolds number P Pressure (Pa)

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Section: Effect Of Inlet Section On 50% Cut Sizementioning

confidence: 90%

Section: Governing Equationsmentioning

confidence: 99%

Section: Effect Of Inlet Section On Pressure Dropmentioning

confidence: 99%

Section: Effect Of Inlet Section On 50% Cut Sizementioning

confidence: 99%

See 2 more Smart Citations

Performance assessment of a square cyclone influenced by inlet section modifications

Hosseini

2020

J Braz. Soc. Mech. Sci. Eng.

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“…The three turbulence models commonly used are standard k − ε model, RNG k − ε model, Reynolds stress model (RSM) and Large eddy simulation (LES) model, while the standard k − ε model and RNG k − ε model are different and accurately describe the changes of internal flow field 23–25 . The LES model and RSM can accurately describe the complex flow field changes in the separator 26–29 . The LES model has strict requirements on grid accuracy, so it needs strong computing power and hardware equipment 30,31 .…”

Section: Numerical Simulation Of Cyclone Separatormentioning

confidence: 99%

Numerical simulation and performance evaluation of cyclone separator with built‐in material for sand removal in gas well

Liang

Huang

Zhao

et al. 2021

Asia-Pacific J Chem Eng

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The natural gas produced from gas wells contains a lot of fine gravel impurities, which causes the blockage of precision pressure regulating equipment and metering equipment. Cyclone separator is widely used in the field of natural gas surface sand removal because of its simple structure and high separation efficiency. In the field application of traditional cyclone separators, there are some problems, such as ineffective separation of fine sand particles in natural gas, low separation efficiency, and large energy loss. In order to solve the above problems, a new cyclone separator is designed in this paper; that is, a cone built‐in object is arranged inside the traditional separator to improve the separation efficiency and reduce the pressure drop. First, the feasibility of the scheme is verified by comparing the computational fluid dynamics (CFD) simulation results of the traditional separator with the experimental results. Second, the performance indexes of the new separator and the traditional separator under specific working conditions are simulated and compared. The conclusions are as follows: compared with the traditional separator, the new separator can improve the tangential velocity of the outer cyclone. It has obvious separation effect on small particles, and the separation particle size ratio can be reduced by 47.83%. The pressure drop of the separator is reduced by 11.42%. While the separation efficiency and precision are improved, the overall performance of the separator is also improved and the energy consumption is reduced.

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Effect of number of inlets on performance and flow field of large‐scale cyclone separators

Wang

Sun

Yuan

et al. 2022

Asia-Pacific J Chem Eng

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The performance and flow field of large-scale cyclones with different inlet numbers were investigated by using computational fluid dynamics methods. The results show that the efficiency, pressure drop, and performance factor of cyclones increase with the increase in the number of inlets, and the quadruple inlet cyclone having the best overall performance is supposed to adopt. The number of inlets of the cyclone increases, the tangential velocity increases, and the short-circuit flow rate decreases; however, when the number of inlets is greater than 2, both variations are lessened. In this study, the vortex eccentricity of the quadruple inlet cyclone is the smallest, the vortex eccentricity of the double and triple inlet cyclone is comparable, and the vortex eccentricity of the single inlet cyclone is the most significant.

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Experimental and numerical study of Stairmand cyclone separators: a comparison of the results of small-scale and large-scale cyclones

Cited by 32 publications

References 28 publications

Performance assessment of a square cyclone influenced by inlet section modifications

Performance assessment of a square cyclone influenced by inlet section modifications

Numerical simulation and performance evaluation of cyclone separator with built‐in material for sand removal in gas well

Effect of number of inlets on performance and flow field of large‐scale cyclone separators

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