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Article Dans Une Revue Journal of Aerosol Science Année : 2000

Deposition of nanosized particles in cylindrical tubes under laminar and turbulent flow conditions

Résumé

There are few studies of deposition of nanoparticles due to di$culties in their generation and size measurement. These di$culties can be overcome by the use of radioactive nanoparticles (Po). This aerosol is obtained with a constant production rate from radon decay, and its concentration is determined using nuclear measurement techniques. We present an experimental and numerical study of Po deposition in laminar and turbulent tube #ows, in order to validate the appropriated theories. For laminar #ows, we observe a better correlation between our experimental and numerical results, as these take into account, unlike analytical theories, all the phenomena occurring. For turbulent #ows, the theories which are the most suitable are those of Wells and Chamberlain (1967, Brit. J. Appl. Phys. 18, 1793}1799) and Friedlander (1977, Smoke, Dust and Haze, Wiley, New York). Our experimental results show that an unexpected surface e!ect on nanoparticles deposition can be observed, even for a hydraulically smooth surface. We also assessed the in#uence of surface roughness on nanoparticle deposition experimentally. Unexpectedly, an in#uence of surface texture on the deposition rate was observed, although all tube surfaces were hydraulically smooth. This could be explained by a di!usion process.

Dates et versions

irsn-04058868 , version 1 (05-04-2023)

Licence

Paternité - Pas d'utilisation commerciale - Pas de modification

Identifiants

Citer

Jeanne Malet, L. Alloul, Nathalie Michielsen, Denis Boulaud, André Renoux. Deposition of nanosized particles in cylindrical tubes under laminar and turbulent flow conditions. Journal of Aerosol Science, 2000, 31 (3), pp.335-348. ⟨10.1016/S0021-8502(99)00062-2⟩. ⟨irsn-04058868⟩

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