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Communication Dans Un Congrès Année : 2013

Local aerosol deposition and gas−flow in vitro measurements using PIV−PLIF techniques

Résumé

During the last decades, numerous in vitro experiments have been proposed to mimick airflow dynamics and deposition patterns of inhaled aerosols in models of lower airways. These experimental developments are needed to assess and validate the computational works employed to quantify diphasic flows features in complex realistic geometries with high spatio-temporal resolutions. So far, most in vitro studies have focused on airflow dynamics characterization. Previous aerosol deposition experiments have mainly provided total or regional deposition efficiency in human or animal models. Yet, the individual particle trajectories and local deposition patterns have been barely investigated, and tracking particle dynamics together with local flow structures still represents a challenging task. The objective of the present work is to characterize unsteady local deposition patterns of aerosols within in vitro simple geometries, as a function of airflow properties. The instantaneous flow velocity fields are obtained using 2D Digital Particle Image Velocimetry (DPIV). The measurement of aerosol concentration fields on the wall is achieved using Rhodamine water solution to provide tracer particles and the Planar Laser Induced Fluorescence (PLIF) technique. Two experimental phases will be presented. The first phase will be dedicated to the case of a round turbulent diphasic jet impinging on a plate under steady flow conditions. This standard case will allow the setting and optimization of the experimental set-up. The second phase will study the case of a diphasic flow generated in a bend geometry using a controlled mechanical ventilation. The deposition patterns obtained for different breathing conditions will be discussed.
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Dates et versions

hal-00949129 , version 1 (19-02-2014)

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  • HAL Id : hal-00949129 , version 1

Citer

Nassim Ait Mouheb, Lucie Bailly, Olivier Boiron, Eric Bertrand. Local aerosol deposition and gas−flow in vitro measurements using PIV−PLIF techniques. 19th Congress of the International Society for Aerosols in Medicine (ISAM), Apr 2013, Chapel Hill, United States. pp.ISSN:1941−2711, 26(2):A28−A28. ⟨hal-00949129⟩
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