An experimental approach to measure particle deposition in large circular ventilation ducts
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The topic of this study is related to airborne particle dynamics in indoor environments. Lab-scale experiments have been performed to investigate particle deposition velocity to six different surfaces orientations (with respect to gravity) for fully developed turbulent flow in horizontal large circular ventilation ducts. Monodispersed aerosol particles (1–6 μm) were used in the deposition experiments. A very low particle mass (40 ng) was measured reliably above background level on duct surfaces by a means of a nondestructive stencil technique associated with fluorescence analysis. For 2–6 μm particles (diffusion and impaction regime), deposition rates to floors were much greater than rates to the ceiling and greater than rates to the wall. For 1-μm particles, the effect of surface orientation to particle deposition was not significant. Results were compared to the very few similar and published studies. This work was conducted in the frame of the CleanAirNet project which aimed at producing new knowledge, models, and techniques to help controlling the safety food stuffs, through a better control of aerosol particle (bioaerosols) transport and deposition in the ventilation networks of the food industry.
KeywordsParticle deposition Large ventilation ducts Turbulent flow Food industries Bioaerosols
This work was conducted within the framework of the CleanAirNet project (supported by the French National Research Agency, ANR), a joint project of research groups from IRSTEA (METFRI-Rennes), GEPEA (Process Engineering laboratory), CSTB (Laboratory of Indoor Environment Microbiology), CERTES-Université Paris-Est (Center for Thermal and Environmental Research), ADRIA NORMANDIE (Center of technological resources devoted to food industry), and LAVAL MAYENNE TECHNOPOLE (territorial agency for economical development and innovation promotion).
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