Much attention has been paid to air quality in urban areas in the last thirty years, with emphasis on reducing the outdoor pollution. Only recently has the international scientific community worried about reducing the contamination of the air of closed

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POLLUTANT TRANSPORT IN INDOOR AIR Department of
Mechanical Aeronautical Engineering
Kambiz Nazridoust and Goodarz Ahmadi
Clarkson University, Potsdam, NY
13699-5727 http//www.clarkson.edu/fluidflow/kam/r
esearch/
ABSTRACT
Much attention has been paid to air quality in
urban areas in the last thirty years, with
emphasis on reducing the outdoor pollution.
Only recently has the international scientific
community worried about reducing the
contamination of the air of closed environments.
Changes in building designs to improve energy
efficiency have caused modern homes and offices
to be more airtight than older structures. There
are many sources of indoor air pollution. Tobacco
smoke, cooking and heating appliances, and vapors
from building materials, paints, furniture, etc.
cause pollution inside buildings. In this study,
a three dimensional numerical model of a house
with multiple rooms was developed using FLUENT
code. Multi-species flow model is used and the
concentration of gaseous pollutants inside the
house was evaluated. Particulate transport and
deposition on walls and furniture were studied.
Different configurations of ventilation systems
were also examined. Particulate emissions due to
walking of the inhabitant were also studied and
the depositions patters were evaluated.
FLOWFIELD SOLUTION
GASEOUS EMISSIONS
Velocity Magnitude and CO2 Concentration
COMPUTATIONAL DOMAIN
Iso-surfaces of CO2 Concentration when emission
source is located on the roof of the small room
Velocity Magnitude and CO2 Concentration
PARTICULATE EMISSIONS
CO2 concentration Contours when emission source
is located on the roof of the small room
CONCLUSIONS

1. Depending on different ventilation designs flow
   pattern and particle deposition will largely
   change.
2. Depending on flow conditions, particles on the
   floor may distribute inside the house and even
   reach the outlets (vents).
3. Large circulations will occur inside the house
   stream-wise and space-wise Walls and furniture
   can affect this circulations.
4. Particle transport and deposition on the surfaces
   depend on the inlet flow velocity and size of the
   particles.
5. Particle deposition is controlled by Brownian
   motion for low velocities and Gravity for large
   particles.

GOVERNING EQUATIONS
Continuity
Momentum
Large Eddy
Particle trajectories from different sources for
1µm particles