ISSN:
1573-0662
Keywords:
Dichloromethane
;
precipitation scavenging
;
washout
;
wet deposition
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
,
Geosciences
Notes:
Abstract An experimental study of the scavenging of dichloromethane vapor by water drops falling at terminal velocity, has been carried out in the UCLA precipitation shaft, in order to test the predictions of theoretical washout models. Whereas good agreement between theory and experiment was found for drops of radius 0.332 mm, computed gas uptake rates for 1.253 and 2.21 mm radius drops were much slower than those measured, just as reported previously for the washout of both sulfur dioxide and acetaldehyde. An analysis shows that theory can be reconciled with all of the experimental data by replacing the compound specific aqueous phase Fickian molecular diffusion coefficient used in the theory, by an ‘effective diffusivity’, having a constant value, (3×10-4 cm2 s-1), independent of the physical and chemical nature of the absorbed species, for all drops of equivalent radii greater than 0.9 mm.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00053722
