Numerical simulation of the electrical double layer development: physicochemical model at the solid and dielectric liquid interface for laminar flow electrification phenomenon

Eladawy, Mohamed; Paillat, T.; Touchard, G.; Cabaleiro, Juan Martin

doi:10.1109/tdei.2011.6032817

Cited by 35 publications

(33 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The fully non-linear system of PDE needs to be solved numerically. A finite volumes numerical solution including adsorption and desorption at the wall, plus dissociation-recombination reactions in the liquid for this problem, and for the transient set in motion of the liquid in the duct can be found in [19]. …”

Section: Resultsmentioning

confidence: 99%

“…On the other hand, the transient formation of an EDL when a quiescent liquid is put in contact with a solid wall is of interest because the results can be extrapolated to the evolution of an EDL in the entrance region of a duct when the liquid is set in motion (this point is discussed further in the results section), which is rather complicated. A numerical solution to the full non-linear partial differential equations, with dissociation-recombination reactions in the liquid, and a reaction model at the interface (preferential adsorption), can be found in [19]. However, in order to obtain analytical solutions some simplifications are needed.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Transient electrical double layer dynamics in a quiescent fluid

Cabaleiro

Paillat

Touchard

2014

IEEE Trans. Dielect. Electr. Insul.

Self Cite

View full text Add to dashboard Cite

From the moment a liquid is put in contact with a solid, physico-chemical reactions occur at their interface. These reactions have been modeled over the years by preferential adsorption or corrosion. Whatever the model, they lead to a charge distribution called electrical double layer (EDL), formed by a charge layer at the solid wall, and a diffuse charge layer of opposite sign in the liquid. In this work we focus on the formation of the EDL when a plane wall is put in contact with a quiescent fluid. The governing equations and a semi-analytical solution are presented. A simpler solution can be found by assuming the instantaneous formation of the charge density profile. The semi-analytical solution presented in this work is compared to the former at different reaction rates leading to the conclusion that for fast enough wall reactions, the instantaneous charge density profile cannot be assumed.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Transient electrical double layer dynamics in a quiescent fluid

Cabaleiro

Paillat

Touchard

2014

IEEE Trans. Dielect. Electr. Insul.

Self Cite

View full text Add to dashboard Cite

show abstract

“…This phenomenon in large forced-oil-cooled power transformers has been implicated in many catastrophic field failures worldwide for more than five decades [2][3][4][5][6][7][8][9][10][11]. In these transformers, Kraft paper wound coils and pressboard washers acquire a negative direct current (DC) polarity, while the flowing oil becomes positively charged [12].…”

Section: Introductionmentioning

confidence: 99%

“…The vessel (7) is inserted in the loop and constitutes of a relaxation zone for the remaining charges and may be used either for pressurisation with gas or for oil recovering under vacuum. Oil resistivity and moisture content are measured online by a laboratory-made conductivity cell (8,9,10) and a moisture measurement device (Panametrics) (11,12), respectively. The capacitive sensor (5) and the streaming vessel (6) are shielded by a grounded steel 'Faraday' cage (13) [9][10][11][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

“…Oil resistivity and moisture content are measured online by a laboratory-made conductivity cell (8,9,10) and a moisture measurement device (Panametrics) (11,12), respectively. The capacitive sensor (5) and the streaming vessel (6) are shielded by a grounded steel 'Faraday' cage (13) [9][10][11][17][18][19]. The capacitive sensor (5) consists of two identical 300 mm length oil ducts of rectangular cross-section (30 mm × 1.85 mm) and each made of 2 mm thickness pressboard sheets stuck together (16) and inserted in a polytetrafluoroethylene (PTFE or Teflon) enclosure (17).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Behaviour of electrical double layer under oil flow and voltage application inside a capacitive sensor

Metwally

LeBlanc

Paillat

2015

IET Science, Measurement & Technology

Self Cite

View full text Add to dashboard Cite

This study presents an experimental investigation of the behaviour of electrical double layer (EDL) under oil flow and voltage application inside a capacitive sensor. This sensor is incorporated in a closed-loop filled with fresh transformer oil. The sensor configuration allows a potential application for risk assessment. The behaviour of EDL is investigated by recording the streaming and the capacitive current waveforms for grounded and energised middle copper-electrode cases and at different oil-flow velocities and temperatures. The effect of direct and alternating voltage energisation is examined for different wave shapes and frequencies. In addition, the physicochemical reaction coefficient, the wall space-charge density and the accumulated charges inside the sensor are calculated by the static and the dynamic methods. The results are interpreted in terms of EDL evolution, physicochemical reaction at the solid-liquid interface, relaxation time of charges and electron emission from the negatively energised electrode. The results reveal that the calculated wall space-charge density slightly decreases with the increase in the oil-flow velocity, contrary to the physicochemical reaction coefficient. For the case of AC energisation, the results show that there is an innocuous effect of the generated harmonic voltages on the oil-flow electrification phenomenon.

show abstract

Static Electrification

Jadidian

Washabaugh

Zahn

2014

Wiley Encyclopedia of Electrical and Electronics Engineering

View full text Add to dashboard Cite

Static electrification ‐ also known as triboelectricy or triboelectric charging ‐ refers to the development of a net electrical charge by the relative motion between two dissimilar materials through friction. Several industries involved with the transport or flow of semi‐insulating liquids have had to cope with the problems and hazards posed by flow electrification. Other industries such as electrostatic printing, mining (various ore‐separation processes), mineral oil purification, microelectronics, and air cleaning/filtration systems also use static electricity and are affected by gas‐solid, solid‐solid and liquid solid static electrification. In this article we begin with a review of the process of electrification driven by the relative motion of two different materials at solid‐solid and gas‐solid interfaces. Then we focus on a particular system where a solid material is stationary and an adjacent liquid dielectric is moving at the interface with the first material. Finally, standard test methods, critical factors and mitigation techniques involved in industrial applications are reviewed.

show abstract

Numerical simulation of the electrical double layer development: physicochemical model at the solid and dielectric liquid interface for laminar flow electrification phenomenon

Cited by 35 publications

References 33 publications

Transient electrical double layer dynamics in a quiescent fluid

Transient electrical double layer dynamics in a quiescent fluid

Behaviour of electrical double layer under oil flow and voltage application inside a capacitive sensor

Static Electrification

Contact Info

Product

Resources

About