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Drag and oscillatory motion of freely falling cylindrical particles
Author(s) -
Marchildon E. K.,
Clamen A.,
Gauvin W. H.
Publication year - 1964
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.5450420410
Subject(s) - drag coefficient , drag , oscillation (cell signaling) , mechanics , reynolds number , particle (ecology) , physics , falling (accident) , magnetosphere particle motion , range (aeronautics) , parasitic drag , terminal velocity , classical mechanics , optics , materials science , geology , chemistry , biochemistry , oceanography , quantum mechanics , magnetic field , composite material , medicine , environmental health , turbulence
The behavior of circular cylinders moving singly through water under the influence of gravity was studied with a motion picture camera over a range of particle. Reynolds number extending from 70 to 2400. The terminal velocity was determined for each particle and its drag coefficient was evaluated. At Re ‐greater than 300, and in some cases as low as 80, the particle acquired a secondary motion, consisting of an angular oscillation about its mean orientation and a periodic lateral deviation from its mean path of fall. A resultant dependence of the drag coefficient on particle density was found to occur. A theoretical method of predicting the period of particle oscillation was developed from consideration of variations in the location of the front‐surface centre of pressure.