Abstract Book

Activated Carbon Fiber (ACF) is capable of removing NOX from the atmosphere.
Therefore, it is very effective for reduction of the ambient NO2 concentration in urban
areas to set up a permeable fence filled with ACF near arterial roads; hereafter, this fence
is called the ACF fence. In this work, to develop the NOX purification method using the
ACF fence, we conducted a wind tunnel experiment simulating a roadside gas diffusion
process around the ACF fence and investigated the NOX removal performance of the
ACF fence under homogeneous wind condition. Concentrations of NO2 and NO were
measured just before and after the ACF fence. To quantitatively evaluate the NOX
removal performance of the ACF fence, the NOX removal rate were estimated on the
basis of concentration statistics. Experiments were conducted for two types of ACF
fence, that is, a panel-shaped fence and a slit-shaped fence. In case where the panelshaped
fence was installed on the leeward side of the road, the local removal rate of NO2
was up to 100 % and the local removal rate of NO was up to 35 %. In case where the slitshaped
fence was installed on the leeward side of the road, the overall removal rates were
higher than observation values on the verification test site. The overall removal rates of
NO increased for lower wind velocity case. This suggests that increasing contact
efficiency between polluted air and ACF surface layer is effective for NO removal.
Particle Manner In SEP (176)
M. Telenta; Faculty of Mechanical Engineering, Skopje, Macedonia, The Former
Yugoslav Republic of
The objective of this paper is to calculate the effect of Coulomb forces on particle
coagulation rate, collision frequencies for particles in laminar shear flow, collision
frequency for particles in Brownian motion, and collection of particles on a cylindrical
obstacle representing the screen wire. It will give an overview of the mechanisms that are
prevailing in particle collection, and therefore, which mechanism will be more effective
in particle removal for certain particle size.
Charging has an effect on the bigger particles where particles acquire larger amount of
charges. Expected particle interaction is higher in the vicinity of the obstacle rather than
away from it. Collision frequency is large for combination of very small and very large
particles. Collision frequency for Brownian motion increases with the particle size. Also,
one can observe that collision frequency is higher in case of smaller particle interacting
with the other particles. Further more, collision frequency decreases when an observed
particle is bigger than the one it interacts with.
One can see that inertial impaction occurs for particles larger than 5 μm since Stokes
number for these particles is larger than Stokes critical number. Also, one can conclude
that inertial interception increases with the increase of the particle size, which is
expected.
Keywords: aerosol, particle collection, Coulomb force, coagulation, SEP
Experimental Measurements And Mass Transfer/reaction Modeling For An
Industrial NOx Absorption Process (90)
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