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Dépoussiérage Electrostatique pour Les Particules Submicroniques en Atmosphère Usuelle (Terre)et Raréfiée (Planète Mars)

Abstract : This work concerns the handling of submicron particles above solar panels using electrostatic precipitators and standing-wave electric curtains in usual atmosphere (Earth) and rarefied atmosphere (Mars) as well as the study of the influence of turbulence on the collection efficiency of dust in electrostatic precipitators. From the determination of electric discharges characteristics in air and carbon dioxide under various pressures, a particular electrostatic precipitator is designed and built up to be used under the conditions of Mars atmosphere in order to hinder or reduce the dust deposition on the solar panels. Another technique, based on standing-wave electric curtains, is studied in order to remove the deposited dust layers. It is shown here that, indeed, dielectric barrier discharges exist which make it possible to charge and to lift the particles that then escape from the zone subjected to the electric field. These two techniques should substantially increase the life-time of solar panels on Mars under the ideal conditions of calm atmosphere. But in the presence of winds or storms their efficiency appears to be very limited. Experiments on the influence of turbulence of the gas flow in the electrostatic precipitators confirmed that the dust collection decreases when the rate of turbulence is increased. The most original result obtained through the study of the influence of particles concentration of dusty gas deals with the origin of turbulence in electrostatic precipitators : turbulence is mainly due to the action of the Coulomb force on the space charge associated with the fine particles whose drift velocity under the effect of the field is low.
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Submitted on : Friday, March 30, 2007 - 1:02:36 AM
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  • HAL Id : tel-00139238, version 1

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Hailong Pang. Dépoussiérage Electrostatique pour Les Particules Submicroniques en Atmosphère Usuelle (Terre)et Raréfiée (Planète Mars). Energie électrique. Université Joseph-Fourier - Grenoble I, 2006. Français. ⟨tel-00139238⟩

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