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Volume 13, No. 3, June 2013, Pages 1070-1077 PDF(266 KB)  
doi: 10.4209/aaqr.2012.09.0255   

Minimum Collection Efficiency Particle Diameter during Precipitation as a Function of Rain Intensity

Chang H. Jung1, Seoung Soo Lee2, Soo Ya Bae3, Yong P. Kim4

1 Department of Health Management, Kyungin Women’s College, Gyesan-gil, Kyeyang-gu, Incheon 407-740, Korea
2 Chemical Sciences Division, NOAA Earth System Research Laboratory (ESRL), 325 Broadway, Boulder, Colorado 80305, USA
3 Korea Institute of Atmospheric Prediction Systems, Boramae-ro 5 gil, Dongjak-gu, Seoul 156-849, Korea
4 Department of Environmental Science and Engineering, Ewha Womans University, 11-1 Daehyun-dong, Seodaemun-gu, Seoul 120-750, Korea




This study found that the minimum collection efficiency particle diameter during precipitation is a function of rain intensity. The raindrop size distribution was parameterized with a log normal size distribution as a function of rain intensity, and the minimum collection efficiency and minimum collection efficiency diameter were obtained analytically.
    The results show that, during precipitation, both the minimum scavenging coefficient diameter and the minimum scavenging coefficient increase along with rain intensity. A comparison of the minimum collection efficiency diameters for various falling velocities reveals that there is not much of a difference in the diameters.
    Both the numerical and analytical results of this study agree well, without much loss of accuracy.



Keywords: Minimum collection efficiency particle diameter; Rain intensity; Polydispersed raindrop size distribution; Analytic solution; Raindrop fall velocity.



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