Modelling the cleaning performance of rotating brush in duct cleaning

The bristle of a rotating duct cleaning brush was modelled using large deformation elastic theory. In addition to contact and centrifugal forces, especially the effect of air drag was studied in the article. The dependence of the drag coefficient on air speed was simulated for numerical computations...

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Bibliographic Details
Published in:Energy and buildings 2002-09, Vol.34 (8), p.845-852
Main Authors: Holopainen, Rauno, Salonen, Eero-Matti
Format: Article
Language:English
Subjects:
Air drag
Bristle
Duct cleaning
Magnitude of normal force
Rotation speed of bristle
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Summary:The bristle of a rotating duct cleaning brush was modelled using large deformation elastic theory. In addition to contact and centrifugal forces, especially the effect of air drag was studied in the article. The dependence of the drag coefficient on air speed was simulated for numerical computations by fitting a fourth degree polynomial in logarithmic co-ordinates on point-wise data for a cylindrical body from literature. The results show that the effect of air drag on the deflection of the single bristle ( L=1 mm, d=1 mm, ρ b=1140 m 3/kg, EI=2 GPa) is negligible at normal rotating speeds of the brush (300−1000 rpm). However, air drag may affect considerably the deflection of a bristle, which has a large diameter and low density. As to be expected, air drag decreases the contact force between the single bristle tip and duct surface even at low rotation speed of bristle (
ISSN:0378-7788
DOI:10.1016/S0378-7788(02)00101-9