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Dynamique d'un aérosol de nanoparticules : modélisation de la coagulation et du transport d'agrégats

Abstract : A complete CFD model for nano-aerosol dynamics is presented and discussed. It consists in an Eulerian "Diffusion-Inertia" equation including a coagulation source term which is rewritten in terms of moments. Deposition phenomenon is taken into account by means of a boundary condition on the flux of moments at walls. The moment transformation allows good computational performances and makes thus the model tractable for industrial and occupational health applications. The implementation of this approach into a CFD code is assessed for simple cases by comparison with sectional approach results and experimental data. These comparisons show that the method of moments does not induce particular bias and that numerical results are in good agreement with available experimental data. An experimental set-up, which consists in a ventilated chamber, is also proposed for allowing a good control of the flow and for allowing the investigation of aggregates morphology. The confrontation between numerical and experimental results highlights that the determination of the fractal parameters is a modelling key point
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https://hal.univ-lorraine.fr/tel-01750217
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Romain Guichard. Dynamique d'un aérosol de nanoparticules : modélisation de la coagulation et du transport d'agrégats. Autre [cond-mat.other]. Université de Lorraine, 2013. Français. ⟨NNT : 2013LORR0137⟩. ⟨tel-01750217⟩

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