Experimental measurements have been conducted to establish a correlation for the settling velocities of cylindrical particles whose length to diameter ratios varied from 10 to 1/10 and Reynolds numbers between 200 and 60,000. It was found that separate correlations exist for cylinders of L/D > 1.0 and for L/D < 1.0. These relationships are expressed analytically and were found to be independent of the Reynolds number. In addition, a qualitative description of the motion generated by the particle during settling has been discussed for cylinder of L/D less than, equal to, and greater than one.
On a fait des mesures experimentales pour etablir une correlation dans le cas des velocites de sedimentation de particules cylindriques, dont les rapports entre la longueur et le diametre variaient de 10 a 0.10 et dont les nombres de Reynolds etaient echelonnes entre 200 et 60,000. On a trouve qu'il existe des correlations distinctes dans le cas des particules cylindriques dans lesquelles le rapport entre la longueur et le diametre est plus grand ou plus petit que l'unite. On a exprime ces relations analytiquement et trouve qu'elles etatient independantes du nombre de Reynolds. On a egalement fait une description qualitative du mouvement produit par les particules durant leur sedimentation, dans le cas de particules cylindriques dont le rapport entre la longueur et le diametre est inferieur, egal ou superieur a l'unite.
[1]
Norman E. Hawk,et al.
Steady and Unsteady Motions and Wakes of Freely Falling Disks
,
1964
.
[2]
H. Taube.
BRIDGING AND NON-BRIDGING LIGAND EFFECTS IN REDOX REACTIONS OF METAL IONS
,
1959
.
[3]
H. Wadell,et al.
The coefficient of resistance as a function of Reynolds number for solids of various shapes
,
1934
.
[4]
W. Kunkel.
Magnitude and Character of Errors Produced by Shape Factors in Stokes' Law Estimates of Particle Radius
,
1948
.
[5]
W. Gauvin,et al.
Fundamental aspects of solids‐gas flow: Part I: Introductory concepts and idealised sphere motion in viscous regime
,
1959
.
[6]
J. S. Mcnown,et al.
Effects of particle shape on settling velocity at low Reynolds numbers
,
1950
.
[7]
A. Clamen,et al.
Drag and oscillatory motion of freely falling cylindrical particles
,
1964
.
[8]
C. M. White.
The drag of cylinders in fluids at slow speeds
,
1946,
Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences.