Modélisation Stochastique Du Dépôt de Particules Colloïdales Sur Des Parois Rugueuses Dans Un Écoulement Turbulent

Download or read book Modélisation Stochastique Du Dépôt de Particules Colloïdales Sur Des Parois Rugueuses Dans Un Écoulement Turbulent written by Christophe Henry and published by . This book was released on 2012 with total page 198 pages. Available in PDF, EPUB and Kindle. Book excerpt: The aim of this PhD work is to develop physical models aiming at simulating particulate fouling (i.e. the accumulation of inorganic colloidal particles on surfaces) in turbulent flows in the framework of stochastic Lagrangian methods. In the first part, a new model for the calculation of particle-surface interactions including the effects of surface roughness is presented. This model is first validated on simple test-cases and the influence of surface roughness on the overall interaction is analysed. This model is then coupled with a model for particle transport in a turbulent flow. Numerical results obtained for particle deposition are found to be in line with measurements. The second part of this work is devoted to the extension of the particle-surface interaction model for the calculation of adhesion forces, accounting for both surface roughness and electrostatic forces. Numerical predictions are in good agreement with experimental data on adhesion forces. Furthermore, this model is coupled with a model for particle resuspension and numerical results obtained are shown to compare well with some available experiments. In the third part of this work, the particle deposition model is extended to simulate the accumulation of particles on a surface through the introduction of particle-particle interactions in the particle-surface interaction. Numerical results are in qualitative agreement with available experimental data, and highlight the ability of the model to reproduce a complete blockage.This study underlines the necessity to account for the coupling between particle-fluid, particle-surface and particle-particle interactions to simulate particulate fouling.