Effect Of Surface Roughness On Neutral And
Dense Gas Dispersion In The BLWT
Author(s)
P. Michálek & D. Zacho
Abstract
Measurements of neutral and dense gas dispersion in a boundary layer wind
tunnel with different surface roughness were performed. Neutral or dense gas
was emitted from a small \“quasi-point” source located in the wind tunnel floor.
This \“quasi-point” source represents leakages of gases from small industrial
plants in the urban area. The tunnel surface was either covered with uniform
roughness or with a smooth surface in order to create a significant difference in
the boundary layer mean velocity profile and turbulence intensity. Also influence
of plume momentum on vertical and horizontal distribution of tracer gas
concentration above the source was studied. Both neutral and dense gases were
marked with tracer gas (ethane) and concentrations were measured with a comb
probe connected to four flame ionization detectors (FID). Results have shown
that plume momentum significantly affects plume shape. Boundary layer
turbulence intensity also affected plume behavior, but to a lesser degree than
plume momentum.
Keywords: gas dispersion, quasi-point emission source, surface roughness,
BLWT.
1 Introduction
Air pollution has become a serious problem in the last few decades. Due to a
large amount of industrial chemical plants, which use many dangerous chemical
substances, there may occur and sometimes really occurs a leakage of different
gases. The modelling of non-buoyant or dense gas dispersion in the air in case of
accidents or terrorist attacks is therefore important from the point of view of
population protection, because non-buoyant and dense gases disperse near the
land surface, thus these gases may threaten human life and health. The process of
Test Establishment, Prague, Czech Republic
Keywords
gas dispersion, quasi-point emission source, surface roughness,
BLWT.
Related Book
Other papers in this volume
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