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Modelling bristle behaviour in rotating brush duct cleaning

Holopainen R., Salonen E.M.
duct | dust | modelling
Bibliographic info: Report B75, 2003 Helsinki University of Technology, HVAC Laboratory - Espoo, Finland - pp 61, 22 Fig., 3 Tab., 16 Ref.
Languages: English

The bristle of a rotating cleaning brush for air ducts was modelled using large deformaion elastic theory. The point collocation method with a trial solution consisting of undertermined parameters was employed to discretize the resulting non-linear problem. The main interest was in determining the value of the bristle tip contact normal force N, the bristle tip contact angle B and the torque T needed to rotate a brush. The results obtained using the simple model were compared with the results obtained from a laboratory test.

The simulated and experimental results show that the magnitude of the normal force and the contact angel increase as a function of the rotation speed n. The results show further that air drag increases the torque and somewhat decreases the contact force between a bristle tip and the duct surface. Howerver, with the normal properties of a brush, air drag only slightly affects the deflections of the bristles at practical rotating speeds.

To facilitate possible brush design work the problem was also studied employing a dimensionless formulation. The parameters that affect the magnitude of the normal force and the contact angle are five dimensionless numbers.

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