Particle Deposition in a Two-Dimensional Slot from a Transverse Stream
Titel:
Particle Deposition in a Two-Dimensional Slot from a Transverse Stream
Auteur:
Carrie, Francois Remi Modera, Mark P.
Verschenen in:
Aerosol science and technology
Paginering:
Jaargang 28 (1998) nr. 3 pagina's 235-246
Jaar:
1998
Inhoud:
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, α, 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 × 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.
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