3-d numerical simulation of particle concentration effect on a single-wire ESP performance for collecting poly-dispersed particles

Farnoosh, Niloofar; Adamiak, K.; Castle, G.S.P.

doi:10.1109/tdei.2011.5704512

Cited by 30 publications

(7 citation statements)

References 16 publications

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“…The average current-voltage characteristics I=I (V ) in the flowing two-phase fluid, having the concentration of smoke particles lower than about 50×10 3 particles cm −3 (figure 4) are close to those in air (figure 5). This is consistent with the results presented in figure 6, which provide additional proof that the average discharge current decreases when the smoke particle concentration increases [6][7][8][9].…”

Section: The First Stage Of the Evolution Of The Ehd Two-phase Flow supporting

confidence: 92%

Introduction to investigations of the negative corona and EHD flow in gaseous two-phase fluids

Mizeraczyk¹,

Berendt²

2018

Plasma Sci. Technol.

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Research interests have recently been directed towards electrical discharges in multi-phase environments. Natural electrical discharges, such as lightning and coronas, occur in the Earth's atmosphere, which is actually a mixture of gaseous phase (air) and suspended solid and liquid particulate matters (PMs). An example of an anthropogenic gaseous multi-phase environment is the flow of flue gas through electrostatic precipitators (ESPs), which are generally regarded as a mixture of a post-combustion gas with solid PM and microdroplets suspended in it. Electrical discharges in multi-phase environments, the knowledge of which is scarce, are becoming an attractive research subject, offering a wide variety of possible discharges and multi-phase environments to be studied. This paper is an introduction to electrical discharges in multi-phase environments. It is focused on DC negative coronas and accompanying electrohydrodynamic (EHD) flows in a gaseous two-phase fluid formed by air (a gaseous phase) and solid PM (a solid phase), run under laboratory conditions. The introduction is based on a review of the relevant literature. Two cases will be considered: the first case is of a gaseous two-phase fluid, initially motionless in a closed chamber before being subjected to a negative corona (with the needle-toplate electrode arrangement), which afterwards induces an EHD flow in the chamber, and the second, of a gaseous two-phase fluid flowing transversely with respect to the needle-to-plate electrode axis along a chamber with a corona discharge running between the electrodes. This review-based introductory paper should be of interest to theoretical researchers and modellers in the field of negative corona discharges in single-or two-phase fluids, and for engineers who work on designing EHD devices (such as ESPs, EHD pumps, and smoke detectors).

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Section: The First Stage Of the Evolution Of The Ehd Two-phase Flow supporting

confidence: 92%

Introduction to investigations of the negative corona and EHD flow in gaseous two-phase fluids

Mizeraczyk¹,

Berendt²

2018

Plasma Sci. Technol.

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“…The results showed that high gas temperature caused more significant ionic wind effects on the secondary gas flow (Li et al, 2015). Particle concentration can influence the gas flow pattern and corona discharge current regardless of mono-dispersed or poly-dispersed size distribution (Farnoosh et al, 2010;Farnoosh et al, 2011).…”

Section: Accepted Manuscriptmentioning

confidence: 99%

“…The electrohydrodynamics (EHD, also called electric wind or ionic wind) is one of the most crucial phenomena in ESPs generated from the momentum transfer between charged ions or particles and the neutral gas molecule (Farnoosh et al, 2011). It reflects the interaction between the primary flow and the secondary flow.…”

Section: Introductionmentioning

confidence: 99%

Correlations between Particle Collection Behaviors and Electrohydrodynamics Flow Characteristics in Electrostatic Precipitators

Yang

et al. 2020

Aerosol Air Qual. Res.

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Electrostatic precipitators (ESPs) are widely used to eliminate particulate matter emissions from industrial sources. However, the complex electrohydrodynamics (EHD) flow in ESPs can cause controversial conclusions on particle collection. This paper established an ESP model with an additional source term added to the equation of gas momentum conservation. Correlations between particle motion behaviors and EHD flow characteristics were investigated regarding various discharge voltage, particle size, and electrode position. Results show that the EHD flow presented a back-and-forth distribution between the electrode and plate. The peak value of vy can be as high as 0.15 m s-1. The EHD flow can cause four possible types of particle motion status. The dominant factor for particle motion switched between the electric force and drag force along with the particle motion trajectory. There existed an escaping window at the ESP inlet. Particles released from this window penetrated through the ESP rather than be collected. Modifying the ESP geometry and increasing voltage can narrow the escaping window. When the ESP channel width was narrowed from 0.06 to 0.05 m, the maximum NEHD could increase by 73.4% from 0.94 to 1.63. Consequently, the collection efficiency was significantly improved. The collection efficiency can even amount to 100% for particles sized 2.5 μm.

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“…The collection efficiency of ESP has been numerically investigated by considering different parameters in many studies. N. Farnoosh et al developed a 3-D numerical model of ESP to study all essential phenomena including the electric field, space charge, flow pattern, particle motion [29], [30].…”

Section: Introductionmentioning

confidence: 99%

Three-Dimensional Numerical Study of Particle Trajectory in Particle Charge and Size Analyzer Considering the Effects of System Parameters

Zhang

Kulon

2019

IEEE Access

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In this study, for the purpose of the optimization of the measurement system performance, a three-dimensional numerical model of the particle charge and size analyzer (PCSA) is presented. The PCSA is capable of simultaneous particle size and charge measurement using phase Doppler anemometry. Numerical simulations of particle transport under the influence of the square-wave excitation field have been carried out to identify the optimal PCSA system configurations, improve the particle detection rate, and minimize the measurement bias due to experimental conditions. For the first time, the three-dimensional (3-D) numerical model was used to study the effects of excitation frequency, magnitude of the electric field, and particle inlet velocity on the particle detection rate and charge and size measurement bias. The airflow and the particle motion in the measurement cell were investigated using commercial FLUENT 14.5 software and the particle detection and validation algorithm was implemented in MATLAB. The particle phase was modelled using the Lagrangian approach. The effect of the electric field on particle trajectories was analyzed by solving a coupled system of the electric field and particle transport equations using the User-Defined-Functions (UDFs) in FLUENT. The model was validated by comparing the numerical results with reported experimental data. This 3-D numerical simulation provides a valuable insight into various tradeoffs between the detection rate of particles with different electrical mobility levels and the PCSA parameters. The numerical simulation results demonstrate that the reduction of the measurement bias of particle charge and size distribution can be achieved while maintaining high particle detection percentage by an appropriate selection of system parameters, leading to a more representative profile of measured aerosols. It is shown that the optimal ranges of the excitation frequency, magnitude of electric field, and particle velocity at inlet are between 40 -50 Hz, 0.3 -0.4 MV/m, and 0.01 -0.03 m/s, respectively.INDEX TERMS Medical aerosol, particle charge and size measurement, phase Doppler anemometry (PDA), numerical simulation.

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3-d numerical simulation of particle concentration effect on a single-wire ESP performance for collecting poly-dispersed particles

Cited by 30 publications

References 16 publications

Introduction to investigations of the negative corona and EHD flow in gaseous two-phase fluids

Introduction to investigations of the negative corona and EHD flow in gaseous two-phase fluids

Correlations between Particle Collection Behaviors and Electrohydrodynamics Flow Characteristics in Electrostatic Precipitators

Three-Dimensional Numerical Study of Particle Trajectory in Particle Charge and Size Analyzer Considering the Effects of System Parameters

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