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The effect of revised collision efficiencies on the growth of cloud droplets by coalescence
Author(s) -
Bartlett J. T.
Publication year - 1970
Publication title -
quarterly journal of the royal meteorological society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.744
H-Index - 143
eISSN - 1477-870X
pISSN - 0035-9009
DOI - 10.1002/qj.49709641014
Subject(s) - coalescence (physics) , falling (accident) , production rate , collision , mechanics , growth rate , physics , meteorology , materials science , chemistry , geometry , mathematics , medicine , industrial engineering , computer security , environmental health , astrobiology , computer science , engineering
The collection efficiencies of water drops falling in still air have been recalculated by Hocking and Jonas (1970). In this paper these revised values have been used to estimate the rate of production of large droplets ( r > 30 μm) by coalescence. It is found that there is an increase in the rate of production of droplets with radii of about 20 to 25 μm compared with the rate calculated using Hocking's earlier (1959) values, but generally a decrease in the rate of production of droplets with radii 20 to 25 μm. It is also shown that neglecting the small, but finite, collection efficiencies predicted for droplets with radii less than about 15 μm has negligible effect on the rate of production of larger droplets.