EVOLUTION OF PARTICLE SIZE DISTRIBUTION IN AIR IN THE RAINFALL PROCESS VIA THE MOMENT METHOD

被引：0
|
作者：
Gan, Fu-Jun [1 ]
Lin, Jian-Zhong [1 ,2 ]
机构：
[1] Zhejiang Univ, Dept Mech, Hangzhou 310003, Zhejiang, Peoples R China
[2] China Jiliang Univ, Hangzhou, Zhejiang, Peoples R China
来源：
THERMAL SCIENCE | 2012年 / 16卷 / 05期
基金：
中国国家自然科学基金;
关键词：
particles in air in the rainfall process; scavenging coefficient; distribution of particle; numerical simulation; AEROSOL; REMOVAL;
D O I：
10.2298/TSCI1205372G
中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
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.
引用
收藏
页码：1372 / 1376
页数：5
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