Journal
BUILDING AND ENVIRONMENT
Volume 44, Issue 10, Pages 2056-2063Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.buildenv.2009.02.009
Keywords
Deposition rate; Hydraulically smooth; Surface roughness; Model evaluation; Carpet; Wall material
Funding
- GACR [101/04/1190, 1101/07/1361]
- Vaisala Foundation/Finnish Academy of Science and Letters
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We investigated the deposition rate of aerosol particles (diameter between 0.03 and 5 mu m) on rough surfaces of wallpapers,. wall-plasters, and two types of carpets inside a test chamber. Compared to a smooth aluminum surface, the deposition rate of aerosol particles on the tested surfaces was up to 20 times depending on the surface roughness, mixing intensity. and particle size. A rough surface with a dimensionless surface roughness height k(+) < 0.06 can be treated as a hydraulically smooth. The estimated deposition rates in this study and those predicted by a deposition model, which incorporates surface roughness, were in good agreement for coarse mode particles (diameter > 1 mu m) when k(+) < 1.04 and for ultrafine particles (diameter < 0.1 mu m) when k(+) < 0.48. The agreement between the model prediction and our estimation was better for coarse mode particles than for ultrafine particles. Deposition of aerosol particles, especially fine particles, needs more empirical investigations aiming at improving the existing models. (C) 2009 Elsevier Ltd. All rights reserved.
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