Laboratory study of aerosol settling velocities using Laser Doppler velocimetry
Autor: | J. J. Iversen, Jonathan Merrison, Andreas Boes Jakobsen |
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Rok vydání: | 2019 |
Předmět: |
Fluid Flow and Transfer Processes
Atmospheric Science Environmental Engineering Materials science 010504 meteorology & atmospheric sciences Scattering Mechanical Engineering 010501 environmental sciences 01 natural sciences Pollution Molecular physics Aerosol Settling 13. Climate action Drag Aerodynamic drag Gas composition Knudsen number Water vapor 0105 earth and related environmental sciences |
Zdroj: | Journal of Aerosol Science Jakobsen, A B, Merrison, J & Iversen, J J 2019, ' Laboratory study of aerosol settling velocities using Laser Doppler velocimetry ', Journal of Aerosol Science, vol. 135, pp. 58-71 . https://doi.org/10.1016/j.jaerosci.2019.05.003 |
ISSN: | 0021-8502 |
DOI: | 10.1016/j.jaerosci.2019.05.003 |
Popis: | As a method to experimentally study aerodynamic drag the terminal settling velocities of aerosolized silica and glass microspheres (with sizes of 1–44 μm) have been measured at various gas pressures in the range 0.6–10 mbar and using various gas compositions including He, Ar, Xe, Air, CO 2 , and water vapour. Within the molecular scattering regime, i.e. where the Knudsen number Kn > 10 and up to 500, reasonable agreement has been found with the model of Epstein (1924). Values of the scattering parameter δ were observed to be within the expected range of 1–1.44 for respectively specular/evaporative - diffuse molecular scattering processes. However, δ was seen to depend upon gas composition, specifically for H 2 O; δ = 0.96 ± 0.07, CO 2 ; δ = 1.16 ± 0.07, noble gasses; δ = 1.25–1.44 and in the case of Air δ = 1.18 ± 0.07 which is not in agreement with that conventionally used of around 1.3–1.4. These observations imply disagreement with the concept of a general or universal model of drag for all particle surfaces and atmospheres. Similarly, for Kn < 10 these results were not well described by conventional models such as the semi-empirical expression of Knudsen-Weber (1911) or the general law of fall proposed by Millikan (1923b). |
Databáze: | OpenAIRE |
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