Showing papers in "Journal of Electrostatics in 1987"

TL;DR: In this paper, the authors describe experiments in which digital processing of experimental records is used to determine viscous and Coulomb friction terms associated with a prototype electro-rheological (ER) damper.

TL;DR: In this paper, a superposed epoch analysis technique was used to show that an energetic electron enhancement typically rises on 2-to 3-day time scale and decays on 3-to 4-day scale at essentially all energies above ca. 3 MeV.

TL;DR: In this article, the transport of pre-charged particles in a wire-plate precipitator in turbulent flow is investigated by numerical solution of the convective diffusion equation for ease of computation the high voltage wire electrodes are replaced by strip electrodes giving essentially the same potential distribution, provided the comparison is made on the basis of equal values of the space-averaged field at the collector.

TL;DR: In this article, a simulation of dispersed particulate behavior under the transient ion density and space-charge fields appropriate to the operation of electrostatic precipitators with pulsed energization is described.

TL;DR: In this article, an instrument is described which is able to measure in situ the dissipation of static charge from sheet materials, and the effectiveness of the material can be expressed by a parameter t 1 2, the time taken for charge to decay to half its initial value.

TL;DR: A review of the literature on the subject of arc discharges on spacecraft dielectric materials that have become charged by energetic electrons and ions is presented in this paper, where the results discussed will be mainly from laboratory measurements of the properties of these arc discharging.

TL;DR: In this paper, it was shown that charge accumulation is not always monotonic: although the magnitude of the charge always increases on average, the charge transfer in any particular contact can be of either sign.

TL;DR: In this article, an experimental research program was conducted to characterize corona generation from different electrode geometries in a range of conditions comparable to those found in electrostatic precipitators.

TL;DR: In this article, the electrostatic problem of a dielectric sphere near a grounded plane in the presence of an electric field is analyzed with the Laplace method using a partitioning plan.

TL;DR: Experiments with the electron gun on the SCATHA satellite produced evidence of beam-plasma interactions, and heating of the low energy electrons around the satellite as discussed by the authors. But, the experiments were conducted near geosynchronous orbit, in the dusk bulge, and plasma sheet, providing a range of ambient plasma densities.

TL;DR: In this paper, a one-dimensional model of a filling silo with continuous charge relaxation is proposed, where the temporal solution is divided into the filling period and the relaxation period (after filling stops).

TL;DR: In this article, the NASA Charging Analyzer Program (NASCAP) has developed a mathematical model of the generation, emission and transport of secondary electrons for a spacecraft charging system.

TL;DR: Personal computer based educational tools which animate the evolutions of electric and magnetic fields in models involving charge relaxation and magnetic diffusion phenomena, as well as programs which demonstrate numerical methods for field computations are described.

TL;DR: In this paper, the authors present a phenomenological account of the preparation and performance of these potential spacecraft materials, including indium oxide, which is easily and economically produced and may therefore offer practicable alternatives to the existing modified forms of Kapton when it is necessary to minimize electrostatic charging on spacecraft.

TL;DR: In this paper, a seeding by parasitic particles is compared with a controlled seeding (two fluid-particle systems) which allow the investigation of EHD effects with laser Doppler anemometry in a certain range of electrical fields.

TL;DR: In this paper, the authors dealt with the determination of the electric field and the ionic distribution in a dielectric with an electric-field dependent dielectrics permittivity.

TL;DR: In this article, a wire-parallel plate device was used to monitor the intensity and distribution of back-corona discharges in a range of environments and geometries common to electrostatic precipitators.

TL;DR: Mise en evidence des problemes poses par la mise en equation de la conservation de la charge dans les dielectriques liquides, lorsqu'on tient compte des conditions aux limites concretes.

TL;DR: An optimization module in the ANSYS® finite element program is also used to design a microstrip transmission line and optimize the design of a coaxial cable, which show excellent agreement with analytical solutions.

TL;DR: In this paper, an electron spectrometer on Meteosat-2 has yielded a continuous data set since 1982 which has clarified the role of plasmasheet electrons in the detailed current balance which controls spacecraft potentials.

TL;DR: In this paper, the surface potential decay characteristics of corona-charged stretched and unstretched PVDF films have been investigated as a function of time, thickness, initial surface potential, and voltage polarity.

TL;DR: In this paper, the repulsive force on a corona wire was investigated experimentally to understand quantitatively the driving force causing wire vibration in electrostatic precipitators, and an empirical formula of the repulsion force per unit length of wire, f r, was derived as a function of line corona current densities, measured at each plate and the dimensions of the electrode system including the two-plate separation, the wire diameter, d, and the wire displacement, X, i.e. f r = A 0 √ d [{( S − X )

TL;DR: An autonomous system to detect both absolute and differential spacecraft charging aboard high-altitude satellites, and to reduce those potentials before hazardous arcing levels are reached, is now being developed under the Air Force program on Space Systems Environmental Interaction Technology.

TL;DR: Two-dimentional problems involving isolated charged cylinders as well as coaxial cylinders are examined using mapping methods in this paper, where two examples are discussed and two different mapping methods are used.

TL;DR: The photoconductivity and dark conductivity of a system consisting of ZnCdS:Ag/Cd(S,Se):Cu mixed in various ratios have been studied in a sandwich-type configuration as mentioned in this paper.

TL;DR: In this article, a transient experimental technique was developed to determine the ratio of forward to reverse current which flows when a dust layer is electrically stressed, and it was demonstrated that for high resistivity (>10 11 Ω cm ) fly ash, reverse current injection sets in at current densities well below those normally associated with practical precipitator operation.

TL;DR: In this paper, the use of the charge-simulation technique with both Laplace's and Poisson's equations to map lines of field and equipotential contours of complex geometries is explained.

TL;DR: In this paper, the theoretical aspects of dielectrophoresis with a rod matrix are presented briefly with emphasis on the creeping flow regime, and particle trajectories are computed numerically in the general case and the critical trajectory ordinates in the numerical solution are compared to their analytical counterpart.

TL;DR: The use of spreadsheets in the solution of Laplace's equations has been studied in this paper, and the advantages and disadvantages of this approach to field solutions have been discussed in detail.