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
EditorsG. Latini, C.A. Brebbia, 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

NameAir Pollution IX

Other

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

Fingerprint

Sulfur dioxide
Vortex flow
Flow structure
Flow fields
Gases

All Science Journal Classification (ASJC) codes

  • Engineering(all)

Cite this

Chen, W-H. (2001). Transient sulfur dioxide absorption inside a freely falling raindrop with terminal velocity. In G. Latini, C. A. Brebbia, G. Latini, & C. A. Brebbia (Eds.), Air Pollution IX (pp. 629-638). (Air Pollution IX).
Chen, Wei-Hsin. / Transient sulfur dioxide absorption inside a freely falling raindrop with terminal velocity. Air Pollution IX. editor / G. Latini ; C.A. Brebbia ; G. Latini ; C.A. Brebbia. 2001. pp. 629-638 (Air Pollution IX).
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Chen, W-H 2001, Transient sulfur dioxide absorption inside a freely falling raindrop with terminal velocity. in G Latini, CA Brebbia, G Latini & CA Brebbia (eds), Air Pollution IX. Air Pollution IX, pp. 629-638, Ninth International Conference on Modelling, Monitoring and Management of Air Pollution: Air Pollution IX, Ancona, Italy, 01-09-12.

Transient sulfur dioxide absorption inside a freely falling raindrop with terminal velocity. / Chen, Wei-Hsin.

Air Pollution IX. ed. / G. Latini; C.A. Brebbia; G. Latini; C.A. Brebbia. 2001. p. 629-638 (Air Pollution IX).

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

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AB - 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.

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Chen W-H. Transient sulfur dioxide absorption inside a freely falling raindrop with terminal velocity. In Latini G, Brebbia CA, Latini G, Brebbia CA, editors, Air Pollution IX. 2001. p. 629-638. (Air Pollution IX).