Aerosol Generation by Condensation in Laminar Boundary Layers for Inhalers (2020)
Type of ContentConference Contributions - Published
PublisherThe University of Queensland
Inhalation devices using thermal aerosol generation offer both electronic control options and cost-effective mass production. Evaporation of liquids, and subsequent dilution of the vapour with ambient air, leads to nucleation and droplet growth depending on the conditions in the mixing zone. In order to provide optimal deposition to the airways, it is important to understand the impact of both flow and design parameters on the particle size distribution. The paper describes experimental observations of aerosol generation in laminar boundary layers over a flat heated surface, wetted with a pure compound. A numerical modelling approach is also described, combining classical nucleation theory, quasi-stationary diffusion for droplet growth, and a simplified aerosol description using a single representative size parameter per cell. Compared with experiments, the model shows the correct order of magnitude of droplet sizes and a similar behaviour regarding changes of flow parameters. It also shows the striped aerosol patterns found in related experiments. A multicomponent droplet growth model is implemented in ANSYS Fluent and used to study the hygroscopic growth of droplets in the human upper airway.
CitationScheunemann P, Schadow D, Stephenson P, Jermy M (2020). Aerosol Generation by Condensation in Laminar Boundary Layers for Inhalers. 22nd Australasian Fluid Mechanics Conference AFMC2020. Proceedings of the 22nd Australasian Fluid Mechanics Conference AFMC2020.
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Keywordsthermal aerosol generation; boundary layer; nucleation; droplet growth
ANZSRC Fields of Research40 - Engineering::4003 - Biomedical engineering
RightsAll rights reserved unless otherwise stated
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