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Experimental determination of collection efficiencies for small water droplets in air
Author(s) -
Woods J. D.,
Mason B. J.
Publication year - 1964
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.49709038602
Subject(s) - radius , collision , mechanics , effective radius , physics , gravitation , meteorology , environmental science , classical mechanics , astrophysics , computer science , computer security , galaxy
This paper describes measurements of collection efficiencies for gravitational collisions between water drops of radius R = 30 to 55 μ and saline droplets of radius r = 1 to 12 μ. the results agree quite well with those obtained earlier by Picknett for drops of R = 30, 40 μ and also with the collision efficiencies computed by Hocking, Mason and Shafrir and Neiburger except that, for values of r / R < 0·1, the experimental values are consistently higher than the calculated values and fail to show the sharp cut‐off predicted by theory. the experiments support Hocking's prediction that drops of R ⩽ 18 μ will fail to collect droplets of smaller size.