Recent advances in electrohydrodynamic pumps operated by ionic winds: a review

Johnson, Melissa; Go, David B.

doi:10.1088/1361-6595/aa88e7

Cited by 110 publications

(53 citation statements)

References 207 publications

(250 reference statements)

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“…In order to investigate the capabilities of corona discharge for new applications, there is a growing need for simplified models. For applications involving small emitting electrodes, such as ionic wind devices, 7,8 an analytical model of the corona discharge current would be a valuable tool.…”

Section: Introductionmentioning

confidence: 99%

Revisiting the positive DC corona discharge theory: Beyond Peek's and Townsend's law

2018

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The classical positive Corona Discharge theory in a cylindrical axisymmetric configuration is revisited in order to find analytically the influence of gas properties and thermodynamic conditions on the corona current. The matched asymptotic expansion of Durbin and Turyn [J. Phys. D: Appl. Phys. 20, 1490–1495 (1987)] of a simplified but self-consistent problem is performed and explicit analytical solutions are derived. The mathematical derivation enables us to express a new positive DC corona current-voltage characteristic, choosing either a dimensionless or dimensional formulation. In dimensional variables, the current voltage law and the corona inception voltage explicitly depend on the electrode size and physical gas properties such as ionization and photoionization parameters. The analytical predictions are successfully confronted with experiments and Peek's and Townsend's laws. An analytical expression of the corona inception voltage φon is proposed, which depends on the known values of physical parameters without adjustable parameters. As a proof of consistency, the classical Townsend current-voltage law I=Cφ(φ−φon) is retrieved by linearizing the non-dimensional analytical solution. A brief parametric study showcases the interest in this analytical current model, especially for exploring small corona wires or considering various thermodynamic conditions.

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Section: Introductionmentioning

confidence: 99%

Revisiting the positive DC corona discharge theory: Beyond Peek's and Townsend's law

2018

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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].…”

Section: Introductionmentioning

confidence: 73%

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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“…In the case of positive polarity, this is due to the presence of electrons that are directed towards the high voltage electrode, causing small shocks on its surface. On the other hand, the collector electrode is bombarded by chemical species such as O3, NOx and SOx, which are generated during electrical discharge [12][13][14][15] . All these collisions of particles on the surface cause the activation of corrosion phenomena dependent on the exposure time and functioning conditions.…”

Section: Introductionmentioning

confidence: 99%

Materials degradation in non- thermal plasma generators by corona discharge

Cogollo¹,

Al²,

Ad³

et al. 2021

Preprint

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Atmospheric corona discharge devices are being studied as innovative systems for cooling, sterilization and propulsion, in several industrial fields, from robotics to medical devices, from drones to space applications. However, their industrial scale implementation still requires additional understanding of several complex phenomena, such as corrosion, degradation and fatigue behaviour, which may affect final system performance. This study focuses on the corrosive behaviour of wires that perform as a high-voltage electrodes subject to DC positive corona discharge in atmospheric air. The experiments demonstrate that the non-thermal plasma process promotes the growth of the oxidative films and modifies the physicochemical properties of the materials chosen as corona electrodes, hence affecting device operation. Surfaces exposed to this non-thermal plasma are electrically characterized by negative exponential decay of time-depend power and analysed with SEM. Implications on performance are analysed and discussed.

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Recent advances in electrohydrodynamic pumps operated by ionic winds: a review

Cited by 110 publications

References 207 publications

Revisiting the positive DC corona discharge theory: Beyond Peek's and Townsend's law

Revisiting the positive DC corona discharge theory: Beyond Peek's and Townsend's law

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

Materials degradation in non- thermal plasma generators by corona discharge

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