Numerical investigation of water surface deformation due to corona discharge

Zehtabiyan-Rezaie, Navid; Saffar‐Avval, Majid; Adamiak, K.

doi:10.1016/j.elstat.2018.10.015

Cited by 13 publications

(6 citation statements)

References 28 publications

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“…When a corona discharge occurs, ions transfer momentum to neutral air molecules, resulting in IW. The velocity of IW generated within the quiescent air is proportional to the square root of the corona current and applied voltage (u IW ∝ √ I, u IW ∝ V a ) [20,39,40]. When convective air flow is added to IW, the situation changes, but not much.…”

Section: Resultsmentioning

confidence: 99%

“…It is reasonable to assume that q s is zero, as water is a conductive material, and hence the space charge in water will be negligible [20].…”

Section: Computational Domainmentioning

confidence: 99%

“…The charge carrier of the opposite polarity is assumed to be absorbed immediately into the discharge electrode and is not considered in the simulation. This is a common approach to simulate the glow corona discharge [13,15,20]. Then, j is given by…”

Section: Governing Equationsmentioning

confidence: 99%

See 2 more Smart Citations

Numerical investigation of the separation mechanism in an electrostatic aerosol-to-hydrosol separator by glow corona discharge: a quantitative comparison of the effects of ionic wind and Coulomb force

Kim

Hwang

2020

Plasma Sources Sci. Technol.

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Electrostatic separation of particles from air onto a liquid surface has attracted increasing attention for various applications such as wet electrostatic precipitators and bioaerosol samplers. In this study, the electrostatic separation of particles onto the liquid surface is numerically modeled in a simplified manner. The simulated separation efficiency is validated by experimental values reported in literature. The effects of ionic wind and Coulombic force on particle separation for various electrical mobilities, applied voltages, and air flow rates are studied by decomposing the total separation efficiency into two components: Coulombic and ionic-wind separation efficiencies. Both Coulombic and ionic-wind separation efficiencies show the same behaviors as the total separation efficiency with changes in the operating conditions: they increase with increasing applied voltage and particle electrical mobility, and with decreasing air flow rate. Overall, the ionic-wind separation efficiency is higher than the Coulombic separation efficiency, mainly because of the short residence time. However, when the applied voltage and particle electrical mobility are high, and the air flow rate is low, the Coulombic force outperforms the ionic wind. Time-scale analysis well explains the relations between the relative importance of each separation mechanism and the operating parameters.

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Section: Resultsmentioning

confidence: 99%

“…It is reasonable to assume that q s is zero, as water is a conductive material, and hence the space charge in water will be negligible [20].…”

Section: Computational Domainmentioning

confidence: 99%

See 1 more Smart Citation

Numerical investigation of the separation mechanism in an electrostatic aerosol-to-hydrosol separator by glow corona discharge: a quantitative comparison of the effects of ionic wind and Coulomb force

Kim

Hwang

2020

Plasma Sources Sci. Technol.

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“…Massive free ions resulting from the corona discharge move along the electric line and collide with neutral molecules in the air, which transfers the momentum from ions to neutral molecules, known as electrohydrodynamic secondary flow (EHD) [5][6][7][8][9]. The significant effect of EHD on the transport of particles, especially fine particles, has been confirmed in previous studies [10][11][12][13]. And the particle transport is closely related to the collection efficiency used for assessing removal performance of ESP.…”

Section: Introductionmentioning

confidence: 80%

The Influence of Electrohydrodynamic Secondary Flow on the Collection Efficiency and Deposition Pattern in ESP

Guo

Wang

et al. 2019

Mathematical Problems in Engineering

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Electrostatic precipitator (ESP) is widely used for dust removal from flue gas in industry. In the electrostatic precipitation, the electrohydrodynamic secondary flow (EHD) produced by corona ionization has an important influence on the characteristics of particle transport and the collection efficiency of ESP. In this work, a comprehensive ESP model with interaction of multiple physical fields is established to study the EHD effect in ESP. The numerical results show that the EHD generally can increase the streamwise velocity of airflow near the collection plate, which makes the removal performance of ESP worsen. Meanwhile, the EHD has a significant effect on the particle deposition pattern, especially at lower flue gas velocity. When the needle tip of discharge electrode points to the collection plate, the EHD can promote the circulation of airflow near the corona wire, increase the probability of particle charging, and then improve the collection efficiency of ESP.

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“…It has been shown that the EHD secondary flow has a significant effect on the transport of particles, especially small particles (Yamamoto et al. 2013; Zehtabiyan-Rezaie, Saffar-Avval & Adamiak 2018); however, the underlying flow mechanism has not been fully elucidated. Therefore, it is important to study the complex interaction between the ion motion and the fluid dynamics in the wire-plate EHD flow.…”

Section: Introductionmentioning

confidence: 99%

Numerical analyses of wire-plate electrohydrodynamic flows

Vázquez

Zhang

2023

J. Fluid Mech.

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We present numerical analyses of two-dimensional electrohydrodynamic (EHD) flows of a dielectric liquid between a wire electrode and two plate electrodes with a Poiseuille flow, using direct numerical simulation and global stability analysis. Both conduction and injection mechanisms for charge generation are considered. In this work we focused on the intensity of the cross-flow and studied the EHD flows without a cross-flow, with a weak cross-flow and with a strong cross-flow. (1) In the case without a cross-flow, we investigated its nonlinear flow structures and linear dynamics. We found that the flow in the conduction regime is steady, whereas the flow in the injection regime is oscillatory, which can be explained by a global stability analysis. (2) The EHD flow with a weak cross-flow is closely related to the flow phenomena in an electrostatic precipitator (ESP). Our analyses indicate that increasing the cross-flow intensity or the electric Reynolds number leads to a less stable flow. Based on these results, we infer that one should adopt a relatively low voltage and weak cross-flow in the wire-plate EHD flow to avoid flow instability, which may hold practical implications for ESP. (3) The case of strong cross-flow is examined to study the EHD effect on the wake flow. By comparing the conventional cylindrical wake with the EHD wake in linear and nonlinear regimes, we found that the EHD effect brings forward the vortex shedding in wake flows. Besides, the EHD effect reduces the drag coefficient when the cross-flow is weak, but increases it when it is strong.

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Numerical investigation of water surface deformation due to corona discharge

Cited by 13 publications

References 28 publications

Numerical investigation of the separation mechanism in an electrostatic aerosol-to-hydrosol separator by glow corona discharge: a quantitative comparison of the effects of ionic wind and Coulomb force

Numerical investigation of the separation mechanism in an electrostatic aerosol-to-hydrosol separator by glow corona discharge: a quantitative comparison of the effects of ionic wind and Coulomb force

The Influence of Electrohydrodynamic Secondary Flow on the Collection Efficiency and Deposition Pattern in ESP

Numerical analyses of wire-plate electrohydrodynamic flows

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