Appel à candidatures, Recrutement | Recherche, Emploi

PhD position on Settling of aerosol in turbulent flows, IMSIA, Paris (France)

Du 31 décembre 2020 au 30 septembre 2024

Début de la thèse Octobre 2020 
Date limite de soumission : 15 juin 2020

Site actualite

Location IMSIA (ENSTA, EDF, CEA, CNRS), Institut Polytechnique de Paris, France 
Contact Romain Monchaux (monchaux@ensta.fr)
Website: https://perso.ensta-paristech.fr/~monchaux/inert_part.html

The present project aims at producing a large set of experimental data enabling to disentangle the role of the different control parameters affecting the settling of aerosols in turbulent flows.

Experimental PhD - Training position Settling of aerosol in turbulent flows

Location IMSIA (ENSTA, EDF, CEA, CNRS), Institut Polytechnique de Paris, France Contact Romain Monchaux (monchaux@ensta.fr)
Website: https://perso.ensta-paristech.fr/~monchaux/inert_part.html

Context

Settling of inertial particles is strongly affected by turbulent flows that usually increase the settling rate of particles even if in extreme cases a reduction can be observed. Along with clustering and preferential concentration, this is one of the challenging issues in our understanding of particle laden turbulent flows. Recent numerical simulations (Monchaux 2017) and experiments (Huck 2018) have strengthened the conviction based on pioneering experimental data (Aliseda 2002) that collective effects linked to fluid-particle interactions are responsible for the settling enhancement. Actual models limited to point particle approximations nevertheless fail to capture the exact dynamics that is controlled by at least four dimensionless parameters linked to particle diameter, fluid to particle density ratio and gravity and turbulence intensity.

Project

The present project aims at producing a large set of experimental data enabling to disentangle the role of the different control parameters. We have chosen to work with a closed flow where turbulence is produced by two vibrated facing grids. The innovating aspect of this project is our simultaneous measurements of both fluid and particles velocities achieved by interfacing Particle Image Velocimetry and Particle Tracking Velocimetry systems. This project involves collaborations with Anne Dejoan in Madrid, Aymeric Vié at Centrale-Supelec and Marc Massot at Ecole Polytechnique who are running numerical simulations.