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Journal of Electrostatics

Journal of Electrostatics

Archives Papers: 386
Elsevier
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Characterizations of solid-liquid interface in a wet-mate subsea HVDC connector
Mattewos Tefferi; Mona Ghassemi; Christopher Calebrese; Qin Chen; Yang Cao;
Abstracts:Wet-mate connectors represent essential and technically challenging components in a subsea HVDC system. In this paper, systematic characterizations of solid-liquid insulation system implemented in a Wet-Mate subsea connector are presented with special focus on the interfaces. First, conduction in the liquid gap was studied using the current-voltage characterization and the Kerr electro-optic field mapping to establish the correlation between conduction and DC field grading for various electrode gap configurations and oil types. Secondly, Kerr electro-optic field sensing was extended to solid-liquid interfaces for model Wet-Mate connectors. Studies suggest that DC field grading in solid-liquid insulation particularly along the interface is influenced by regimes of conduction depending on the electrode configuration, gap separation, polarity, oil type, moisture and contaminants, and such dependences are further affected by the DC properties of hybrid solid-liquid insulations. Exemplar modelling studies conducted on representative design configurations indicate that this comprehensive basic study could provide insight into the tailoring of solid-liquid interfaces with low field distortion under quasi steady-state and polarity reversal operations for safe design and optimization of DC Wet-Mate connectors.
The structure of field-induced near-wall charged layers arising in weakly conducting liquids near the surface of solid dielectrics
Yu.K. Stishkov; S.A. Vasilkov; D.A. Nechaev;
Abstracts:The present paper investigates space charge formation that occurs near the surface of a solid dielectric in a weakly conducting liquid and takes place under the action of the strong external electric field and due to constant dissociation. The cases of 1D and a more complex 2D macro scale geometries are studied numerically using Comsol Multiphysics software. In the general case, the charge accumulates in a diffuse layer and can get in the bulk in consequence of its transport along the dielectric surface; and there is also a dissociation-recombination layer of ion deficit (same as in the electrohydrodynamic conduction pumping).
Practical performance of an electrostatic cleaning system for removal of lunar dust from optical elements utilizing electrostatic traveling wave
Hiroyuki Kawamoto; Shusuke Hashime;
Abstracts:The removal of lunar dust deposited on solar panels, heat radiators, and optical elements (e.g., lens and mirrors) is one of the critical issues for a long-term lunar exploration. We have developed a cleaning system to remove the deposited lunar dust using an electrostatic traveling wave. When a four-phase rectangular voltage is applied to a transparent plate consisting of circular vortical ITO (indium tin oxide) electrodes printed on a glass substrate to move the electrostatic field toward the outer direction, the lunar dust on the plate is removed outwards following the movement of the electrostatic traveling wave. In this study, the effects of pressure and temperature that simulate the lunar environment were investigated, and it was demonstrated that high performance was maintained in a harsh lunar environment. It was confirmed that the low-frequency mechanical vibration generated by the movement of a rover improves the cleaning efficiency. The actual energy consumption of this system was evaluated, and it was demonstrated to be negligible with a simple high voltage source.
Capacitance and forces for thick circular electrodes
Francesco Maccarrone; Giampiero Paffuti;
Abstracts:Some new results are presented concerning the forces between two equal circular electrodes of finite thickness. For close electrodes different scenarios result, depending on the thickness and on the ratio of charges of the conductors. Attractive or repulsive forces can appear depending on the parameters and on the separation of the electrodes. The force between the electrodes can be non monotonic as a function of the distance and one or more equilibrium points can appear. A unified description of cylindrical systems using a high precision method based on a Galerkin expansion is given and we check our results with a quite accurate boundary element method (BEM).
Electrostatic focusing of electrospun Polymer(PEO) nanofibers
Rudolf Kyselica; Eniko T. Enikov; Peter Polyvas; Rein Anton;
Abstracts:Polymer nanofibers have a specific set of material properties that are favorable for many applications in biomedical engineering (scaffolds, stents or tissues engineering). In this article, influence of the electrostatic field distribution on the fiber deposition pattern is examined. The electrode pair used in the study is part of a lineal quadrupole trap used in ion trapping experiments. The impact of the bias potential on the nanofiber collection patterns and the electrospinning process is examined through a series of experiments and finite-element analysis of the resulting field distribution. A set of optimal amplitudes of the steering electric field components is also reported.
Experimental study on the impact of electrostatic effect on the movement of charged particles
Wang Jianan; Wang Xue; Zhu Tingyu; Zhao Yi;
Abstracts:In this research, the Electrostatic-bag-precipitator (EBP) platform was made of the fully transparent organic glass materials, and the Particle Image Velocimetry (PIV) device was used to carry out the direct test of the charged particles movement in the precipitator. The Electrical Low Pressure Impactor (ELPI+) was applied to test the charge amounts of the outlet of the electrostatic precipitator (ESP) part and the outlet of EBP simultaneously. It was found that the movement of charged particles was both affected by the electrostatic repulsion among the particles and the charged dust layer on the filter cartridges, and the effect was positively correlated with the charge amounts on the particles and the dust layer. The variation law of cumulative charge amounts of the dust layer under different voltages and during different time phases was analyzed indirectly and the corresponding function model was established, hoping to provide reference for the research on the high-efficient trapping technique of fine particles.
"Relay-race" mechanism of partial discharges in a long chain of cavities for stochastic nature of process
A.L. Kupershtokh; D.I. Karpov;
Abstracts:A stochastic model of partial discharges (PDs) inside a linear chain of gas cavities in condensed dielectrics is developed. The equations for electric field potential and electric charge transfer are solved together for dielectric with these inclusions. Computer simulations show the possibility of a "relay-race" mechanism of propagation of partial discharges in this chain of gas cavities even if the stochastic nature of partial discharge is taken into account. This mechanism can be realized if the distances between cavities are small enough and the dependence of probability function of partial discharges r ( E ) on electric field strength is rather sharp. In this case, the wave of partial discharges can propagate along the chain of cavities. The PD waves can be initiated in the first cavity as well as in the last cavity in the chain. Occasionally, two PD waves can arise from the both edges of the chain. The sequence of partial discharges in the inclusions has a completely stochastic character for a weak mutual influence of cavities on each other.
A microfluidics device for 3D switching of microparticles using dielectrophoresis
Waqas Waheed; Anas Alazzam; Eiyad Abu-Nada; Saud Khashan; Mohammad Abutayeh;
Abstracts:Here we describe the design, modeling, fabrication, and successful utilization of a microfluidic switching device that employs dielectrophoresis to effectively manipulate micro-scale entities in a microchannel. Two sets of opposing interdigitated transducer electrodes are micropatterned at the bottom of the device. The electrodes enter slightly from each side-wall into the channel. Finite Element Analysis and experimental results demonstrate that this design enables 3D switching of micro-objects at any location in the microchannel. Living cells are switched to one of the three downstream branches by varying the actuation voltages on the electrodes.
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