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Title of article :
Particle Deposition in a Two-Dimensional Slot from a Transverse Stream
Author/Authors :
Carrié، نويسنده , , François Rémi; Modera، نويسنده , , Mark P، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 1998
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Abstract :
This paper addresses the problem of coarse mode particle deposition in a two-dimensional slot from a transverse flow. A dimensional analysis enables us to identify five independent dimensionless groups: the leak Reynolds number, Re, the dimensionless velocity gradient of the approaching flow, agr, the Stokes number, Stk, the slot aspect-ratio, e/h, and the interception parameter, dp/h.. A sticky aerosol (MMD ≊3-7 μm; GSD ≊ 2-3) was injected into a 15 cm diameter duct and blown out through a rectangular opening (3 times 40 mm; e = 0.6 mm) drilled in a direction perpendicular to the flow. A video camera was set up to continuously monitor the leak behavior in time. The image then was digitized, enabling us to assess the slot-width as a function of time. It appeared that the slot could be sealed in less than 20 minutes. These results were compared with a simplified model based on a scale analysis of the deposition velocity on the slot thickness. Agreement between predicted and measured leak-widths is very good when the pressure differential across the opening does not exceed 60 Pascals. Deposition on the upstream edge is observed only when its surface is not smooth.
Journal title :
Aerosol Science and Technology
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