High Efficiency Particulate Air (HEPA) filtration is a key point for the safety of workers and environment especially for activities dealing with hazardous materials such as nuclear matter. For industrial risks likely to lead to an important release of particles, consequences of such an event need to be quantified. For the specific case of fire event, particles emitted during combustion are mainly formed by aggregates of spherical carbonaceous nanoparticles. For such situation, recent works lead to a phenomenological model of clogging in which one of the most sensitive parameters is the cake porosity. Up to now, existing models use the porosity as an input data, generally experimentally determined or deduced according to empirical relation. Nevertheless it is essential to describe in a rigorous way this parameter since porosity strongly depends on filtration conditions and particles properties and may evolve during the process. The prediction of this porosity is fundamentals to make filter efficiency and clogging models fully predictive. Many authors have experimentally (Choi et al. 2004, Kim et al. 2009, Elmoe et al. 2011, Liu et al. 2013, Thomas et al. 2014…) or numerically (Mädler et al. 2006, Lindquist et al. 2014) investigated the evolution of a deposit of spherical and fractal nanoparticles according to the transport of the aerosol characterized by the Peclet numbers (Pe). The present work aims to describe experimentally and theoretically, the evolution of deposit porosity, according to analytical experiments with controlled particle production and covering a wider range of Peclet numbers...
Session: G6 - Surface Filtration II
Day: 23 October 2019
Time: 10:45 - 12:00 h