An experimental study of the electrohydrodynamic flow in electrostatic precipitators

Leonard, G.; Mitchner, M.; Self, S. A.

doi:10.1017/s0022112083002657

Cited by 108 publications

(56 citation statements)

References 5 publications

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“…It has been observed that the distance between spikes is critical for the flow pattern: for larger distances a well-organized spiral flow is formed, while at the reduced distance a turbulent flow arises. These agreed with the earlier experimental observations: for the positive corona discharge, which is uniform along the corona wire, the flow turbulence increases only slightly whereas the negative corona discharge strongly reinforces the turbulence intensity [8,9]. …”

Section: Introductionsupporting

confidence: 93%

Numerical Simulation of the 2-D Gas Flow Modified by the Action of Charged Fine Particles in a Single-Wire ESP

Adamiak

Atten

2009

IEEE Trans. Dielect. Electr. Insul.

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Abstract-A numerical model for simulating precipitation of submicrometer particles in a single-wire electrostatic precipitator is discussed in this paper. It includes all essential phenomena affecting the process: electric field, space charge density, gas flow, including the secondary electrohydrodynamic flow caused by the corona discharge and charged particles, and particle transport. A simplified corona model assumes just one ionic species and neglects the ionization zone. The fully coupled model for the secondary EHD flow, considering the ion convection, has been implemented. The dust particles are charged by ionic bombardment and diffusion. The gas flow pattern is significantly modified by the secondary EHD flow, which depends on the particle concentration. As for fine particles the drift velocity is small and particles practically follow the gas streamlines, the particle concentration has a very strong effect on the precipitation efficiency.

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Section: Introductionsupporting

confidence: 93%

Numerical Simulation of the 2-D Gas Flow Modified by the Action of Charged Fine Particles in a Single-Wire ESP

Adamiak

Atten

2009

IEEE Trans. Dielect. Electr. Insul.

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“…This pattern qualitatively supported the findings of past numerical investigations by Lei et al [18] and Zhao [19]. Such a phenomenon has also been observed by Leonard [20]. However, the formation of this EHD pattern has not been explained so far and few of the recent visualization studies with solid particles provided in the introduction part mentioned the existence of this flow pattern.…”

Section: B Ehd Flow Transitionsupporting

confidence: 90%

Experimental Study on EHD Flow Transition in a Small Scale Wire-plate ESP

Wang

Xie

et al. 2016

Measurement Science Review

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The electrohydrodynamic (EHD) flow induced by the corona discharge was experimentally investigated in an electrostatic precipitator (ESP). The ESP was a narrow horizontal Plexiglas box (1300 mm×60 mm×60 mm). The electrode set consisted of a single wire discharge electrode and two collecting aluminum plate electrodes. Particle Image Velocimetry (PIV) method was used to visualize the EHD flow characteristics inside the ESP seeded with fine oil droplets. The influence of applied voltage (from 8 kV to 10 kV) and primary gas flow (0.15 m/s, 0.2 m/s, 0.4 m/s) on the EHD flow transition was elucidated through experimental analysis. The formation and transition of typical EHD flows from onset to the fully developed were described and explained. Experimental results showed that the EHD flow patterns change depends on the gas velocity and applied voltage. EHD flow starts with flow streamlines near collecting plates bending towards the wire electrode, forming two void regions. An oscillating jet forming the downstream appeared and moved towards the wire electrode as voltage increased. For higher velocities (≥0.2 m/s), the EHD transition became near wire phenomenon with a jet-like flow structure near the wire, forming a void region behind the wire and expanding as voltage increased. Fully developed EHD secondary flow in the form of counter-rotating vortices appeared upstream with high applied voltage.

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“…Since Leonard et al (1983) and Yamamoto (1989) emphasize the importance of controlling the quality of flow characteristics, an internal diameter D, of 650 mm was chosen as a compromise between the flow regime, which should be laminar to maximize the capture efficiency, and the flow rate, that should be as high as possible. The radius was subsequently defined by choosing a Reynolds number slightly lower than 2000 for the flow rate of 100 L/min.…”

Section: Air Sampler Design and Performancementioning

confidence: 99%

Investigation of a New Electrostatic Sampler for Concentrating Biological and Non-Biological Aerosol Particles

Roux

Kaspari

Heinrich

et al. 2013

Aerosol Science and Technology

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The detection of airborne pathogens is becoming a subject of great concern in modern day society. Recent studies have shown that electrostatic samplers are suitable for collecting microorganisms as well as preserving their viability. In most of these studies, flow rates were lower than 12.5 L/min or required a concentration stage to increase the flow rate to 100 L/min. In the present study, a single stage electrostatic sampler was developed for an efficient collection of microorganisms at 100 L/min. The design is based on the positive DC corona between coaxial cylinders to continuously create charged particles as they pass through the sampler. The physical collection efficiency of the device was investigated by sampling the ambient air particles. The efficiency in collecting live biological samples was determined by sampling live bacterial spores with the collector situated inside an aerosol chamber. It is shown that particles of 0.3-0.35 µm are captured with an efficiency of about 86%, whereas cultivable spores of Bacillus thuringiensis are collected with an efficiency of about 94%. Results are compared with an analytical predictive model. The experimental results are similar to the efficiencies previously reported in the literature; however, the current sampler design features a higher flow rate which enables the device to be used as an alarm trigger in a shorter period of time.

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An experimental study of the electrohydrodynamic flow in electrostatic precipitators

Cited by 108 publications

References 5 publications

Numerical Simulation of the 2-D Gas Flow Modified by the Action of Charged Fine Particles in a Single-Wire ESP

Numerical Simulation of the 2-D Gas Flow Modified by the Action of Charged Fine Particles in a Single-Wire ESP

Experimental Study on EHD Flow Transition in a Small Scale Wire-plate ESP

Investigation of a New Electrostatic Sampler for Concentrating Biological and Non-Biological Aerosol Particles

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