TY - JOUR
TI - Evolution of particle size distribution in air in the rainfall process via the moment method
AU - Gan Fu-Jun
AU - Lin Jian-Zhong
JN - Thermal Science
PY - 2012
VL - 16
IS - 5
SP - 1372
EP - 1376
PT - Article
AB - Population balance equation is converted to three moment equations to  describe the dynamical behavior of particle size distribution in air in the  rainfall. The scavenging coefficient is expressed as a polynomial function of  the particle diameter, the raindrop diameter and the raindrop velocity. The  evolutions of particle size distribution are simulated numerically and the  effects of the raindrop size distribution on particle size distribution are  studied. The results show that the raindrops with smaller geometric mean  diameter and geometric standard deviation of size remove particles much more  efficiently. The particles which fall in the “greenfield gap” are the most  difficult to be scavenged from the air.