Modélisation stochastique du dépot de particules colloïdales transportées par des écoulements turbulents isothermes et non isothermes

Abstract : We present new results obtained with the generalisation to non isothermal flows of a Near-Wall particle deposition Model (NWM). This work is divided in two parts. The first part consists in coupling the Generalised Langevin Model used to compute the particles statistics in the core of the flow with the NWM that calculates particles motion in the vicinity of the wall. In order to achieve the coupling, we focus on the balance of fluxes of fluid particles crossing the interface between the models. This amounts to assessing if the coupling is valid in the fluid limit case, as non-physical accumulation of fluid particles can occur at the interface. It has lead to theoretical and numerical developments on the conditional statistics of particles crossing an interface. The particle deposition rate is then computed with inertial particles and the model reproduces satisfactorily experimental studies in isothermal flow. In the case of non isothermal flows, particles can experience thermophoresis (which is a mechanism that induces a particle flux in the presence of a temperature gradient) that may strongly affect the particle deposition rate. We thus choose to model thermophoresis in NWM to predict accurate particule deposition in non isothermal flows. We first investigate thermophoresis in gas as it is well explained. Thermophoresis in liquids is then studied. In contrast to the gases, the theory and experiment of thermophoresis in liquids are far from being well established. The last part of this work, dedicated to the modelisation of thermophoresis in liquids in the NWM has lead to new promising numerical results of particle deposition enhanced by thermophoresis
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Clara Martineau. Modélisation stochastique du dépot de particules colloïdales transportées par des écoulements turbulents isothermes et non isothermes. Autre [cond-mat.other]. Université de Lorraine, 2013. Français. ⟨NNT : 2013LORR0194⟩. ⟨tel-01750448⟩

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