The clogging of fibrous air filters by solid aerosol particles
in the inertial interception capture range was experimentally
and theoretically investigated. Flat filters were loaded to
particle filter cake formation at 0.10 m/s filter face
velocity with monodisperse aerosols.
An evaporator-condenser aerosol generator capable of producing
a stable 0.6 kg/hr product of monodisperse, solid aerosols in
the range 1 to 5 micrometers aerodynamic diameter was
designed, fabricated, and optimized. The output aerosol was
introduced into a vertical challenge duct, where the mass
concentrations upstream and downstream of the filter sample,
and thus the filter penetration, were measured using
continuous flow sampling through two light scattering
photometers. Simultaneous measurements were made of the
filter flow resistance during the particle loading process.
A discussion of the possible definitions of clogging is given
from descriptions of the plots of the experimental filtration
responses with mass challenge. The relationship between the
clogging point and effective filter pore diameter for
different aerosol challenges is given for medium efficiency
fibreglass papers and for filters made with 15.5 micrometer
diameter monodisperse fibres.
A Doctoral Thesis. Submitted in partial fulfillment of the requirements for the award of Doctor of Philosophy of Loughborough University.