Funded by: Philip Morris Products S.A.
PhD: Lilya Ghazaryan
Supervisor: Bernard Geurts / Steffen Stolz
Collaboration: Philip Morris International Research & Development
Understanding the behavior of aerosol droplets in
porous media is of importance for many applications. For instance, in order to
quantify filtration efficiency of filters, it is essential to know the dynamics
of the droplets in such environments. By performing mathematical modeling and
numerical simulations we aim to have a detailed description of the processes
that droplets undergo during their traversal through the porous material (e.g.,
deposition on the surface of the solid and thermal processes, such as
evaporation and condensation).
The motion of a droplet is directly, or indirectly,
influenced by a number of factors. Properties of a droplet, such as its shape,
mass and chemical composition, are essential parameters, which influence its
dynamics. During the droplet's motion through the porous medium these
parameters can change due to the varying conditions encountered by the droplets
on their path through the flow field. These variations in local properties can
be caused by variations in the inner structure of the porous material.
Basically, it is a very complex system with three major components: fluid, the
droplets that are embedded in the fluid and the porous material through which
the fluid flows. There are a number of approaches for modeling each of these
In this research project we employ an Euler-Lagrange
approach for the fluid-particle two-phase flow. The fluid phase is solved using
the incompressible Navier-Stokes equations and the porous medium is
incorporated using the immersed boundary method. The motion of small spherical
particles in a fluid flow is approximated by including Stokes drag and a random
Brownian forcing. Dependency of filtration characteristics on several physical
parameters, such as porosity, gas flow rate, temperature of the gas, particle
size, etc., is quantified.
Papers in preparation:
1. Ghazaryan, L. and Geurts, B.J. and
Lopez Penha, D.J. and Stolz, S. and Kuczaj A., “No-slip consistent immersed boundary
particle tracking to simulate impaction filtration in porous media”
(to be submitted to International Journal
of Numerical Methods in Fluids).
1. •L. Ghazaryan , D.J. Lopez Penha, B.J. Geurts, S.
Stolz, A.Kuczaj ,
”Particle tracking in porous media to estimate aerosol filtration”,
WSC2011 Woudschoten conference, 5-7 October 2011, Zeist, Netherlands.
2. •L. Ghazaryan, D.J. Lopez-Penha, B.J. Geurts, S. Stolz,
“Simulation of impaction filtration of aerosol droplets in porous
media”, ECCOMAS; Portugal 2010