Particle and Aerosol Research Vol. 5, No. 4, December 2009 |
ISSN : 1738-8716 (Print) ISSN : 2287-8130 (Online) |
Numerical study on heterogeneous behavior of fine particle growth
FAN Fengxian*, YANG Linjun, Yuan Zhulin, Yan Jinpei and Jo Young Min
Abstracts
PM2.5 is one of critical air pollutants due to its high absorbability of heavy metallic fumes, PAH and bacillary micro
organisms. Such a fine particulate matter is often formed through various nucleation processes including condensation.
This study attempts to find the nucleation behaviors of PM2.5 arisen from coal power stations using a classical
heterogeneous Fletcher¡¯s theory. The numerical simulation by C-language could approximate the nucleation process
of PM2.5 from water vapor, of which approach revealed the required energy for embryo formation and embryo size
and nucleation rate. As a result of the calculation, it was found that wetting agents could affect the particle nucleation
in vapor condensation. In particular, critical contact angle relates closely with the vapor saturation. Particle condensation
could be reduced by lowering the angles. The wetting agents aid to decrease the contact angle and surface tensions,
thereby may contribute to save the formation energy.
Key words : Particle nucleation, Fletcher¡¯s theory, Particle wettability, Numerical simulation
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