Effect of Electrostatic Force on Deposition of Aerosol Particles with Diameter between 0.5 and 3μm

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  • 気中浮遊粒子の沈着に及ぼす静電気力の影響の評価
  • キチュウ フユウ リュウシ ノ チンチャク ニ オヨボス セイデン キリョク

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To evaluate surface contamination of materials and products in clean rooms due to particulate matter suspending in air, it is necessary to predict deposition rates of aerosol particles. Deposition of particles, particularly those larger than 1μm, is often a problem in various kinds of industries, such as pharmaceutical, food, and biotechnological industries. In this paper, deposition of particles onto a horizontal wall in a clean room is studied for particles with diameter between 0.5 and 3μm. In the experiment, a laminar circular jet of aerosol, the average velocity of which is equal to that of air in the room, is impinged onto metal plates. To investigate effect of electrostatic forces on the deposition, positively or negatively charged plates and a grounded plate are used as the walls onto which the deposition occurs. Deposition velocities of monodisperse aerosol particles are obtained by observations of particles deposited on the wall surface by an optical microscope. Amounts of electrical charge on individual particles are also measured to obtain charge distribution of the aerosol particles. The measured deposition velocities are found to show a good agreement with those calculated from coulombic and gravitational forces acting on the particles. It is also suggested in this work that both the particle charge and the electric field in the vicinity of the wall are indispensable in prediction of particle deposition.

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