THE EFFICIENCY WITH WHICH DRIZZLE AND PRECIPITATION SIZED DROPS COLLIDE WITH AEROSOL-PARTICLES

被引:27
作者
MCGANN, BT
JENNINGS, SG
机构
[1] Department of Experimental Physics, University College, Galway
来源
ATMOSPHERIC ENVIRONMENT PART A-GENERAL TOPICS | 1991年 / 25卷 / 3-4期
关键词
COLLISION EFFICIENCY; BELOW-CLOUD SCAVENGING; SCAVENGING RATE; AEROSOL PARTICLE; DRIZZLE DROP; PRECIPITATION DROP;
D O I
10.1016/0960-1686(91)90077-K
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Values of collision efficiency and scavenging rates for drops interacting with aerosol particles are presented using more accurate flow fields than previous work and for a much greater number of drops than hitherto obtained. All calculations are performed at an ambient temperature of 10-degrees-C and atmospheric pressure of 900 mb. Computations of collision efficiency are performed for a drop radius range from 50 to 500 micrometre (mu-m), for particle radius from 0.005 to 10-mu-m, for relative humidity values of 50, 75, 95 and 100%, and for particle density of 1, 1.5, 2.0 and 2.5 x 10(3) kg m-3. In addition the collision efficiency was also calculated for electric charges on the drop and particle, and for an electric field, representative of typical thundercloud values. Combined use is made of a rigorous trajectory model together with a flux model and comparison is made between them in the overlap size region. Precipitation scavenging rates and the percentage of aerosol particles scavenged by precipitation drops described by Marshall-Palmer size distributions is also calculated.
引用
收藏
页码:791 / 799
页数:9
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