Effect of relative humidity on current–voltage characteristics of monopolar DC wire-to-plane system

Aissou, Massinissa; Said, Hakim Ait; Nouri, Hamou; Zebboudj, Y.

doi:10.1016/j.elstat.2015.05.019

Cited by 22 publications

(11 citation statements)

References 19 publications

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“…As the applied voltage increased from 1.5 to 5.5 kV for a 1 cm gap space, an increase in the onset current was measured. This relationship, discussed in previous studies, − is due to the increase in the electric field at the surface of the anode which leads to an increase in the total positive space charge, more ionizing collisions, and a greater number of charged ions contributing to the onset current …”

Section: Discussionmentioning

confidence: 85%

High-Voltage Electrodes in Moist Air Accumulate Charge That is Retained after Removing the Electric Field

Fawole,

Ristenpart

2023

Langmuir

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Applying a high voltage to a metal electrode that is disconnected from a circuit rapidly induces a capacitive charge, which quickly relaxes after removal of the applied voltage. Here, we report that if the electrode is placed in air at a sufficiently high relative humidity and provided the connection between the high-voltage supply and the electrode is composed of two different metals, the expected capacitive charge is followed by a gradual increase in charge. Surprisingly, this extra charge persists after the removal of the applied voltage and even after physically removing the electrode from the Faraday cup used to measure the charge. We report the median charge, average charge rate, and residual charge for different applied voltages, different metal–metal connections, and varied humidity. We interpret the results in terms of a proposed water ionization mechanism and discuss the implications of the findings for high-voltage fluidic systems.

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Section: Discussionmentioning

confidence: 85%

High-Voltage Electrodes in Moist Air Accumulate Charge That is Retained after Removing the Electric Field

Fawole,

Ristenpart

2023

Langmuir

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“…The humidity is controlled with a three ways circuit with taps. Air is hydrated (14) with the water vapour provided by heating a half full bottle of distilled water; ways (13) and (15) being closed. The drying of the air is made by the way (16) in using silicagel contained in a bottle, when the ways (14) and (13) are closed.…”

Section: Experimental Apparatus and Methodsmentioning

confidence: 99%

“…The drying of the air is made by the way (16) in using silicagel contained in a bottle, when the ways (14) and (13) are closed. The opening of way (13), the closing of ways (14) and (15) of the circuit allow to keep a constant humidity inside the box. Air is then filtered (16) before it is let again in the box.…”

Section: Experimental Apparatus and Methodsmentioning

confidence: 99%

“…Otherwise, the humidity modifies the corona behaviour due to the electronegative nature of water vapor; adding water vapor to air would increase the attachment coefficient of the mixture. However, the basic principle of wet ESP is identical to the dry ESP, the difference lies in the presence of a layer of damp on the collecting electrodes and besides the interelectrode air is saturated with water vapor [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

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Analysis of the Current-Voltage Characteristic during the Corona Discharge in Wires-To-Planes Electrostatic Precipitator under Variable Air Humidity

et al. 2019

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In the present work an experimental investigation has been carried out on the influence of the air humidity or the water vapor injected in the incoming air flow on DC corona discharge parameters in a wire-to-planes electrostatic precipitators. To characterize the behavior of the corona discharge for both positive and negative corona, the current-voltage characteristics are subjected to an analysis using the model of Cooperman which derives the quadratic Townsend law and the general formula proposed by Meng et al. The experimental results show that the discharge current is strongly influenced by the level of air humidity. Moreover, the corona current becomes very small with the applied voltage beyond Hr = 90%, because the particle size is increased by condensation. It was demonstrated that the Coopeman model is reliable to determine the mobility of the charge carriers in this system.

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“…Aissou et al . [9], with the biased‐current probe to measure the current density and electric field, analysed the behaviour of DC monopolar corona discharge in the wire‐to‐plane configuration under variable humid air conditions. Deng et al .…”

Section: Introductionmentioning

confidence: 99%

Effects of humidity on variation of negative corona‐generated space charge in rod to plane electrode

Bian

Zhu

et al. 2018

J. eng.

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Effect of relative humidity on current–voltage characteristics of monopolar DC wire-to-plane system

Cited by 22 publications

References 19 publications

High-Voltage Electrodes in Moist Air Accumulate Charge That is Retained after Removing the Electric Field

High-Voltage Electrodes in Moist Air Accumulate Charge That is Retained after Removing the Electric Field

Analysis of the Current-Voltage Characteristic during the Corona Discharge in Wires-To-Planes Electrostatic Precipitator under Variable Air Humidity

Effects of humidity on variation of negative corona‐generated space charge in rod to plane electrode

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