Transient sulfur dioxide absorption inside a freely falling raindrop with terminal velocity

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

When a raindrop with fixed radius falls downward in association with terminal velocity, a recirculation bubble always accompanies the gas-phase flow field in the aft region of the drop. With regard to drop internal flow structure, it is sensitive to the drop's size. When the drop radius is small (e.g. rs=200μm), only a single vortex motion is seen inside the drop. Under such a situation, sulfur dioxide absorbed from the interface is mainly transported from the area in front of the aft stagnation point. In contrast, as the drop is relatively large, say, rs=500μm, it is of interest to find that a two-vortex motion, composed of a primary and a secondary vortexes, appears. As a result, the onset of SO2 transport process occurs at the drop's surface near where the two vortexes meet. Accordingly, it is recognized that transient SO2 transport processes inside a raindrop is essentially affected by drop size.

Original languageEnglish
Title of host publicationAir Pollution IX
EditorsJ.W.S. Longhurst, G. Latini, C.A. Brebbia
Pages629-638
Number of pages10
Publication statusPublished - 2001 Dec 1
EventNinth International Conference on Modelling, Monitoring and Management of Air Pollution, Air Pollution IX - Ancona, Italy
Duration: 2001 Sep 122001 Sep 14

Publication series

NameAdvances in Air Pollution
Volume10

Other

OtherNinth International Conference on Modelling, Monitoring and Management of Air Pollution, Air Pollution IX
CountryItaly
CityAncona
Period01-09-1201-09-14

All Science Journal Classification (ASJC) codes

  • Engineering(all)

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  • Cite this

    Chen, W-H. (2001). Transient sulfur dioxide absorption inside a freely falling raindrop with terminal velocity. In J. W. S. Longhurst, G. Latini, & C. A. Brebbia (Eds.), Air Pollution IX (pp. 629-638). (Advances in Air Pollution; Vol. 10).