Proceedings of 2002 IEEE 14th International Conference on Dielectric Liquids. ICDL 2002 (Cat. No.02CH37319)

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Modeling of electrohydrodynamic flows and micro-bubbles generation in dielectric liquid by lattice Boltzmann equation method
Proceedings of 2002 IEEE 14th International Conference on Dielectric Liquids. ICDL 2002 (Cat. No.02CH37319) - - Trang 45-48
D.A. Medvedev, A.L. Kupershtokh
The Lattice Boltzmann Equation (LBE) method was used to simulate a liquid flow with space electric charge. New approach to describe the charge transfer due to convective charge transport was proposed. Simulations of two-dimensional electrohydrodynamic flow showed pulsations caused by the injection of charged blobs and by the hydrodynamic instability of charged jet. Generation and growth of micro-b...... hiện toàn bộ
#Electrohydrodynamics #Dielectric liquids #Lattice Boltzmann methods #Equations #Fluid flow #Space charge #Charge transfer #Hydrodynamics #Electrodes #Voltage
Transformer performance assessment
Proceedings of 2002 IEEE 14th International Conference on Dielectric Liquids. ICDL 2002 (Cat. No.02CH37319) - - Trang 317-320
A. Garnitschnig
In today's deregulated electricity industry, transformers constitute a significant asset for utilities. Asset owners are continually being asked to do more with less. To achieve this monumental task, utility managers need detailed information about the current capability of the transformer, based on its condition (aging and health). Transformer performance assessment (TPA) combines online and offl...... hiện toàn bộ
#Temperature #Petroleum #Hydrogen #Condition monitoring #Data visualization #Visual databases #Aging #Fault detection #Data acquisition #Cooling
Measurement equipment for investigation of the influence of viscosity of dielectric working fluids on spark erosion
Proceedings of 2002 IEEE 14th International Conference on Dielectric Liquids. ICDL 2002 (Cat. No.02CH37319) - - Trang 301-304
H.-P. Schulze, G. Wollenberg, M. Lauter, M. Storr, W. Rehbein
In the paper functional goals of the measurement equipment for the investigation of electrical discharges in dielectric working fluids are discussed. Electrical discharges take place at electrode distances smaller than 200 /spl mu/m. As an example the influence of the viscosity on the ignition behaviour and on typical phases of the spark erosion are analyzed.
#Dielectric measurements #Viscosity #Pollution measurement #Pulse measurements #Electric variables measurement #Electrodes #Current measurement #Sparks #Velocity measurement #Pressure measurement
Influence of hydrostatic pressure on the characteristics of discharges propagating on solid/liquid insulating interfaces under AC and DC voltages
Proceedings of 2002 IEEE 14th International Conference on Dielectric Liquids. ICDL 2002 (Cat. No.02CH37319) - - Trang 207-210
A. Beroual, N.K. Bedoui
This paper is aimed at the influence of the hydrostatic pressure on the discharge propagating at the liquid/solid insulating interfaces under AC and DC voltages using a point-plane electrode arrangement. It is shown that different shapes of creepage discharges and associated currents can be initiated for the same experimental conditions indicating the existence of different propagation modes of di...... hiện toàn bộ
#Solids #Voltage #Electrodes #Power transformer insulation #Dielectric liquids #Surface discharges #Oil insulation #Optical propagation #Safety #Minerals
Pico-second time domain reflectometry response of a microstripline embedded in various liquids
Proceedings of 2002 IEEE 14th International Conference on Dielectric Liquids. ICDL 2002 (Cat. No.02CH37319) - - Trang 329-332
B.R. Sharma, S.C. Mehrotra
A microstripline having 50 ohms characteristic impedance has been delineated on PCB type FR-4 board material, by using standard three layer dry film lamination and chemical photo-etching technology. The dielectric constant and dissipation factor for FR-4 substrate material is 4.6 and 0.018 at 1 MHz respectively. The fringing fields arising from free end of a microstripline have been employed to ob...... hiện toàn bộ
#Reflectometry #Microstrip #Liquids #Dielectric materials #Chemical technology #Impedance #Optical films #Lamination #Dielectric constant #Dielectric substrates
Experiments and modelling of conduction and charge accumulation in liquid crystal cells
Proceedings of 2002 IEEE 14th International Conference on Dielectric Liquids. ICDL 2002 (Cat. No.02CH37319) - - Trang 377-381
A.R.M. Verschueren, R.A.H. Niessen, P.H.L. Notten, W. Oepts, E.M.L. Alexander-Moonen
The combination of different electrical measurements on liquid crystal (display) cells yields a consistent model for charge transport and accumulation. At small timescales (ms) the charge transport is dominated by mobile ions, but on long timescales (hrs) it is demonstrated that the (bulk) generation of extremely. low mobility ions determines the transport. These slow ions accumulate at an ionic d...... hiện toàn bộ
#Liquid crystals #Liquid crystal displays #Active matrix liquid crystal displays #Voltage measurement #Current measurement #Stress measurement #Impedance measurement #Dielectric constant #Electric variables measurement #Polyimides
Electrical treeing in polycrystalline and single-crystalline ices under impulse voltages
Proceedings of 2002 IEEE 14th International Conference on Dielectric Liquids. ICDL 2002 (Cat. No.02CH37319) - - Trang 151-154
S. Takata, R. Hanaoka, T. Hama, Y. Nakagami, R. Shimizu
Using two hexagonal H/sub 2/O ices, polycrystalline and single-crystalline ices, the electrical treeing has been studied under an applied impulse voltage. The crystallinity and temperature of ices play an important role in the events of the treeing. In the single-crystalline ice, the tree in samples at -25/spl deg/C always progressed along the basal plane of the ice crystal, but at -196/spl deg/C,...... hiện toàn bộ
#Ice #Voltage #Permittivity #Dielectrics and electrical insulation #Crystallization #Temperature dependence #Conductivity #Trees - insulation #Dielectric losses #Testing
Electrodynamical currents in a wire-wire electrode system
Proceedings of 2002 IEEE 14th International Conference on Dielectric Liquids. ICDL 2002 (Cat. No.02CH37319) - - Trang 63-66
Y.K. Stishkov, A.V. Buyanov
In the present report, results of computer processing of video recording EHD flows in a symmetric system of electrodes such as two wires are presented. The field of speeds of two-dimensional EHD flows is restored with high accuracy by means of a specially developed package of programs. Visualization of EHD flows represents a challenge, since low conductivity liquids are very sensitive to contamina...... hiện toàn bộ
#Electrodes #Acceleration #Visualization #Wire #Counting circuits #Video recording #Packaging #Conductivity #Liquids #Contamination
Study of dielectric relaxation in 2,4-dimethyl substituted pyridine using microwave cavity spectrometer and time domain reflectometer
Proceedings of 2002 IEEE 14th International Conference on Dielectric Liquids. ICDL 2002 (Cat. No.02CH37319) - - Trang 354-357
G.K. Johri, R. Sharma, M. Johri, S. Johri, S. Saxena
We have used microwave cavity spectrometer and time domain reflectometer for the measurement of permittivity and dielectric loss at different temperatures in 2,4-dimethyl substituted pyridine. The observed data of the width of resonance profile and the shift in the resonance frequency have been analyzed by using Slater perturbation equations useful for cavity spectrometer. The parameters measured ...... hiện toàn bộ
#Electrochemical impedance spectroscopy #Dielectric loss measurement #Dielectric losses #Dielectric measurements #Permittivity measurement #Loss measurement #Time measurement #Temperature #Resonance #Microwave measurements
Cathode sheath formation of corona discharge in liquid argon
Proceedings of 2002 IEEE 14th International Conference on Dielectric Liquids. ICDL 2002 (Cat. No.02CH37319) - - Trang 131-134
N. Bonifaci, A. Denat, V.M. Atrazhev, V.V. Atrazhev, I.V. Kochetov, A.P. Napartovich
A one-dimensional longitudinal model including the cathode sheath, the drift region and the external circuit has been used for conditions close to experiments of a corona discharge in liquid Ar. The model provides the space and time variations of the electric field, electron and positive ion densities in the cathode region, as well as the time variations of the electric current through the dischar...... hiện toàn bộ
#Cathodes #Corona #Argon #Artificial intelligence #Purification #Electrons #Voltage #Poisson equations #Space charge #Atmospheric modeling
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