Abstract
Deposition velocity onto a 450-mm-flat-plate in parallel airflow was numerically investigated by considering the influence of simultaneous electrophoresis and thermophoresis on particles in charge equilibrium. Both the face-up and face-down orientations of the flat plate were considered. When the electric field strength was 0V/cm, the deposition velocity of particles in charge equilibrium was greatly influenced by thermophoresis, in the size range between 0.005μm and 3μm. With increasing electric field strength, the deposition velocity of particles in charge equilibrium under the existence of thermophoresis increased for both the face-up and face-down surfaces and the size range of particles affected by thermophoresis became narrower. The electric field of 1000V/cm appeared to make the deposition velocity of particles in charge equilibrium almost unaffected by thermophoresis. For the face-down surface, the deposition velocity of micrometer-sized particles dropped sharply even with the attractive thermophoresis and electrophoresis, owing to gravitational settling effect. With a strong electric field applied, the deposition velocity of particles smaller than approximately 3μm onto both the face-up and face-down surfaces was expected to be high, even thermophoresis was repulsive.
Published Version
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