Diesel exhaust particles charged by barrier discharge

Sano, Yusuke; Kawada, Yoshifumi; Takahashi, Takéo; Ehara, Yoshiyasu; Ito, Tairo; Zukeran, Akinori; Takamatsu, T.

doi:10.1016/s0021-8502(00)90889-9

Cited by 8 publications

(13 citation statements)

References 1 publication

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“…For instance, the particle velocity fields are deflected toward the grounded electrode when a positive voltage is applied ( figure 4(k), figure 4(l) and figure 4(m)). This result is mainly due to the positive ions remaining in the gap as it has been reported in the past [14,15]. However, some amount of particles can migrate in the opposite direction during the early stage of the filament propagation and far from its location ( figure 4(o)).…”

Section: Discussionmentioning

confidence: 52%

Effect of a filamentary discharge on the particle trajectory in a plane-to-plane DBD precipitator

Zouzou¹,

Moreau²

2011

J. Phys. D: Appl. Phys.

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To cite this version:N Zouzou, E Moreau. Effect of a filamentary discharge on the particle trajectory in a plane-to-plane DBD precipitator. Journal of Physics D: Applied Physics, IOP Publishing, 2011, 44 (28) Abstract. In this paper, particle velocity fields inside a plane-to-plane Dielectric Barrier Discharge (DBD) precipitator is investigated using time-resolved Particle Image Velocimetry (PIV). The main objective is to analyze the effect of a filamentary discharge on the particle trajectory. A sine wave high voltage (24 kV, 30 Hz) is applied to create a DBD inside a planar gap (6.4 mm) filled with particles with a mean size of about 0.28 µm. The time-averaged velocity of the flow in the center of the channel is about 1 m/s. After the establishment of the discharge several filaments cross the gap, which induce a strong effect on the particle trajectory. During a complete period of the voltage, successive phenomena are observed. Before the first filament propagation, the shape of the velocity profiles is typical of a laminar flow. At the early stage following the filament propagation across the gap, the grey-level images show a sudden disappearance of the particles at the same location where the filament takes place. This is due to the fast precipitation of particles. During the positive half-cycle, the particles migrate mainly toward the grounded electrode due to their positive net charge. At the end of a half-cycle, the polarity of the electric field is reversed then the particles initially charged return toward the channel center. Consequently, the particles oscillate delaying their collection.

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Section: Discussionmentioning

confidence: 52%

Effect of a filamentary discharge on the particle trajectory in a plane-to-plane DBD precipitator

Zouzou¹,

Moreau²

2011

J. Phys. D: Appl. Phys.

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“…At last, the potentialities of plasma assisted combustion to clean reactor is mentioned in [30,[43][44][45]. Few works deal with the removal of both gaseous and particulate pollutant using non thermal plasma [16,43,[46][47][48][49]. However, filamentary discharges with subsequent surface vaporisation would probably reduce the catalytic activity with repeated cleaning phases.…”

Section: Cleaning Mechanismsmentioning

confidence: 99%

“…The surface polarization of the dielectric barrier prevents the formation of spark but involves an alternative power supply (typically a few kV at 50 Hz to 1 MHz) [5][6][7][8][9]. DBD has been applied to the electrostatic charging of aerosol by collection of gaseous ions [10][11][12] and to the collection of aerosol particles [13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Self-cleaning, maintenance-free aerosol filter by non-thermal plasma at atmospheric pressure

Jidenko

Borra

2012

Journal of Hazardous Materials

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Two lab-scale self-cleaning filters based on dielectric barrier discharges in air at atmospheric pressure have been developed and tested. Experimental results on aerosol removal by charging and electro-collection are presented versus plasma and hydrodynamic parameters for monodisperse aerosol from 20 nm to 1.2 μm. For classical atmospheric aerosol, the average mass and number filtration efficiencies exceed 95% and 87%, respectively in the most penetrating size range (100-700 nm). The frequency of the applied voltage controls the amplitude of the oscillation of charged particle and can be adjusted to favour either filtration or cleaning. Low frequency (1 kHz) is suitable for electro-collection, while high frequency (60 kHz) is favourable for filter cleaning. Electrical characterization and filter efficiency are two indicators of the filter loading. The durations of both filtration step at maximal efficiency and cleaning step depends on the deposited mass, the surface input power and subsequent dielectric surface temperature.

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“…The highly filamentary discharge is composed of small canals (about 100 µm in diameter), crossing the gap. The excess of positive ions in the discharge gap, due to the higher mobility of electrons, leads to positive net charge of the submicron particles [31,32]. The polarity of the voltage really applied to the gas changes alternatively, but the sign of the particle charge remains unchanged, which induces particle oscillations.…”

Section: Collection Efficiencymentioning

confidence: 99%

Electrostatic precipitation of submicron particles using a DBD in axisymmetric and planar configurations

Dramane

Zouzou

Moreau

et al. 2009

IEEE Trans. Dielect. Electr. Insul.

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The aim of the present work has been to quantify the efficiency of Dielectric Barrier Discharges (DBDs) for the collection of submicron particles. The experiments were performed with incense smoke particles having a mean size of about 0.3 µm. An aerosol spectrometer was employed for characterizing the size distribution of these particles at the outlet of Wire-to-Cylinder (WC) and Plate-to-Plate (PP) DBD reactors. The collection efficiency was estimated for various applied voltages (6 -26 kV, 1 -2000 Hz), and airflow rates of 1.6 -24 L/min. The discharge mode was diffuse, in the case of the axisymmetric configuration, and filamentary, in the case of the planar configuration. When flow rate increases, the discharge current and the electric power decrease in both cases. This effect is less pronounced with the planar configuration. Results obtained with the aerosol spectrometer show that the particle collection efficiency of both reactors is higher at high applied voltage and low flow rate; it decreases at high frequency because of particle oscillations, and at low frequency due to the intermittent nature of the discharge. The frequency range for which the collection efficiency is higher than 90% is wider in the case of WC reactor.

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Diesel exhaust particles charged by barrier discharge

Cited by 8 publications

References 1 publication

Effect of a filamentary discharge on the particle trajectory in a plane-to-plane DBD precipitator

Effect of a filamentary discharge on the particle trajectory in a plane-to-plane DBD precipitator

Self-cleaning, maintenance-free aerosol filter by non-thermal plasma at atmospheric pressure

Electrostatic precipitation of submicron particles using a DBD in axisymmetric and planar configurations

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