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Dust Deposition on Single Cylinders

Subramanyam, MV and Kuloor, NR (1969) Dust Deposition on Single Cylinders. In: Annals of Occupational Hygiene, 12 (1). pp. 9-25.

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The inertial impaction of Lycopodium spores on single wires lying transverse to the direction of flow has been studied. The equations of particle motion in a potential flow field have been modified for the case when Stokes' law is inapplicable. Solutions to the above equations have been obtained by digital computation. Rec, the Reynolds number based on cylinder diameter, varied from 4 to 240; particle trajectories in a flow field at Rec = 10 have been determined for inertia parameter K = 1, 2, 4, 6, and 10. Ten trajectories were developed for the above cases by the numerical stepwise method. Experiments were performed by depositing Lycopodium spores on adhesive-coated wires of various diameters and at different velocities. The weight of dust deposited was determined with a microbalance. The experimental conditions were:. Wire diameters: 345, 457, 1500 μ. Particle diameter: 35 μ. Air velocities: 20-250 cm/sec. Inertia parameter: 1-60. The particle was considered as a point mass in the theoretical analysis. But in the experiments the ratio of particle size to wire size was not negligible (rp/rc = 0·1) and hence the effect of finite size of particle on collection efficiency due to the direct interception effect has been estimated. The effect of particle size distribution on collection efficiency has also been estimated. The experimental efficiencies obtained compare well with the calculated efficiencies at Rec = 10 when direct interception is taken into account.

Item Type: Journal Article
Publication: Annals of Occupational Hygiene
Publisher: Oxford University Press
Additional Information: Copyright of this article belongs to Oxford University Press.
Department/Centre: Division of Mechanical Sciences > Chemical Engineering
Date Deposited: 17 May 2010 06:41
Last Modified: 17 May 2010 06:41
URI: http://eprints.iisc.ac.in/id/eprint/27658

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