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The collection efficiencies of hailstones
Author(s) -
Macklin W. C.,
Bailey I. H.
Publication year - 1968
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.49709440114
Subject(s) - radius , spheres , materials science , meteorology , geometry , environmental science , physics , mathematics , engineering , aerospace engineering , computer science , computer security
The collection efficiencies of smooth spheres and artificial hailstones have been determined experimentally. There is no significant difference between the values for the artificial hailstones and those for smooth spheres of the same cross‐sectional area. However, the results are generally lower than those predicted by the theory of Langmuir and Blodgett, particularly at low airspeeds. Using these data the critical liquid water concentrations for large natural hailstones have been calculated. These are not markedly dependent on hailstone radius and, for a cloud droplet radius of 15 μ, are approximately 3 to 5 g m −3 and 4 to 7 gm −3 at the −20 and −30°C levels respectively.