Time-frequency analysis of the vortex motion in a cylindrical cyclone separator

Gao, Zhuwei; Wang, Juan; Wang, Jiangyun; Maruyama, Yu

doi:10.1016/j.cej.2019.05.054

Cited by 41 publications

(7 citation statements)

References 33 publications

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“…The dominant frequency in the vortex finder of the cyclone separator was related to inner vortex rotation. Gao et al (2019) performed experiments and observed the flow to develop from single vortex motion (dominated by a concentrated frequency) to a double vortex motion (dominated by two concentrated frequencies).…”

Section: Introductionmentioning

confidence: 99%

Revealing the details of vortex core precession in cyclones by means of large-eddy simulation

Brar

Derksen

2020

Chemical Engineering Research and Design

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We investigate the three-dimensional, time-dependent behaviour of coherent flow structures inside two cyclone separator geometries, a Stairmand cyclone and a swirl tube, operating in the turbulent regime. For this, large-eddy simulations (LES) with a standard Smagorinsky subgrid-scale model are carried out on the single-phase flow employing a nonorthogonal curvilinear hexahedral mesh. Reynolds numbers (Re) are in the range 910 4 to 410 5 .The simulations successfully capture the quasi-periodic precessing vortex core (PVC) phenomenon. The spectra derived from the temporal signals of different flow variables viz. static pressure, tangential velocity, axial velocity and radial velocity in the Stairmand cyclone exhibit two distinct frequencies at all Re, whereas the spectra for the swirl tube show a single peak. These spectra strongly resemble those reported in the experimental literature. The periodicity pertaining to the inner vortex about its rotational axis is also analysed. Next, the effect of Re on the two distinct spectral peaks have been evaluated for the Stairmand cyclone.Lastly, we present the effect of Re on mean and fluctuating fields and their variations along the geometrical axis of the cyclone.

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Section: Introductionmentioning

confidence: 99%

Revealing the details of vortex core precession in cyclones by means of large-eddy simulation

Brar

Derksen

2020

Chemical Engineering Research and Design

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“…The components of the multiphase flow in this paper are air, dust particles, and water mist, and turbulence plays an important role in the aggregation of the particles. Compared with the standard

model, the Reynolds stress model (RSM) turbulence model introduces the correlation terms of the rotation and curvature to avoid the occurrence of a negative normal stress, so the RSM turbulence model was applied [ 25 ]. The Reynolds stress term includes the turbulence closure, which must be modelled to solve Equation (2).…”

Section: Numerical Simulationsmentioning

confidence: 99%

Numerical Investigation of Fine Particulate Matter Aggregation and Removal by Water Spray Using Swirling Gas Flow

Qian

Wang

Liu

et al. 2022

IJERPH

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In this paper, a mathematical model based on the two-fluid frame model coupled with the population balance model which considers the aggregation of particles and droplets in detail for cyclonic spray dedusting is proposed. The model is applied to study the characteristics of multiphase flow field and the effects of the gas velocity, spray volume, and particle concentration on the removal efficiency. In addition, the simulation results are verified by the experimental data. The results suggest that the turbulence kinetic energy increases near the wall as the inlet velocity increases, and the spray region increases as the spray volume increases. This is conducive to turbulent mixing of the particles and droplets, and the agglomeration efficiency of the particles is improved, so the particle size increases, and the particle removal efficiency increases to 99.7% by simulation results are within the allowable range of error (about 99–99.5% in dedusting efficiency by experimental data). As the particle concentration increases, the particle removal efficiency initially increases, then decreases and reaches the highest value at 2 g/m3, which is due to the limited adsorption efficiency of the spray droplets. The results are helpful for providing a theoretical basis for spray to promote agglomeration of particles and improving the dust removal efficiency in the swirl field.

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“…Gas-solid separation is a general process which often used in industry. Various types of equipment have been commonly used for gas-solid separation such as cyclone separator, bag filter and electrostatic precipitators [1,2]. Cyclone separator is the most commonly used in industries due to its several advantages compared with other equipment, such as low installation, operational and maintenance costs, no moving components (static parts).…”

Section: Introductionmentioning

confidence: 99%

Using computational fluid dynamics to predict the erosion rates on the cyclones wall for coal boiler plant

Anindito

Nurtono

Winardi

2020

JMES

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In the industrial coal boiler, cyclone is used to separate the silica sands (as fluidizing medium) from the furnace combution gas. A gas-solid separation system with turbulent swirling flow that occurs in the cyclone will cause erosion on the cyclone wall. The erosion will cause a decrease in the cyclone performance and increase the maintenance cost. CFD simulation was conducted to predict this erosion using industrial cyclone in the coal boiler industry on its actual dimensions. The dimensions were 5120 mm in diameter and 13970 mm in height. It was performed using the Reynolds Stress Model (RSM) for turbulence flow in the gas phase and the Oka erosion model. The erosion rate on the cyclone wall was investigated at various gas inlet velocity and solid rate. The inlet velocities ranged from 6 to 8 m/s and the solid rates ranged from 30 to 40 kg/s with silica sands as solid particles (0.075 and 1.5 mm in diameter). At the selected local area, the results showed that the higher gas inlet velocity for the same solid rate would increase the erosion rate (about 25%). However, the higher solid rate for the same velocity will also increase the erosion rate on the cyclone wall (about 18%). These results indicate that cyclone wall errosion are significantly affected by inlet gas velocity.

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Time-frequency analysis of the vortex motion in a cylindrical cyclone separator

Cited by 41 publications

References 33 publications

Revealing the details of vortex core precession in cyclones by means of large-eddy simulation

Revealing the details of vortex core precession in cyclones by means of large-eddy simulation

Numerical Investigation of Fine Particulate Matter Aggregation and Removal by Water Spray Using Swirling Gas Flow

Using computational fluid dynamics to predict the erosion rates on the cyclones wall for coal boiler plant

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