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Fundamental aspects of solids‐gas flow: Part III. Accelerated motion of a particle in a fluid
Author(s) -
Torobin L. B.,
Gauvin W. H.
Publication year - 1959
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.5450370605
Subject(s) - drag , reynolds number , mechanics , drag coefficient , turbulence , acceleration , physics , flow (mathematics) , drag equation , wake , added mass , particle (ecology) , classical mechanics , geology , drag divergence mach number , oceanography , quantum mechanics , vibration
An analysis of the extensive literature on non‐steady drag forces supports the correlation of the data by means of a total drag coefficient, which appears to be a function of the Reynolds Number and of a reduced time parameter which is related to the number of particle diameters traversed since the initiation of the motion. The added mass concept is shown to be both completely inadequate and theoretically unsound. An increase in wake turbulence resulting from Reynolds Number increases or from the occurrence of surface roughness seems to diminish the acceleration effects. Fundamental studies of the flow fields around blunt bodies reveal the extreme complexity of the phenomena occurring during acceleration. Explanations offered for the characteristics of the non‐steady drag coefficient behavior re shown to be frequently at variances with these findings.