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Drag Force
Non-spherical particles/ellipsoids
For non-spherical (chains or fibers) particles, Stokes’ drag law must be modified. i.e.,
 |
(15) |
where de is the diameter of a sphere having the
same volume as the chain or fiber. That is,
 |
(16) |
and K is a correction factor.
For a cluster of n spheres, . For tightly
packed clusters, k < 1.25. Some other values of K are listed in Table 5.
Table 5: Correction Coefficient
| Cluster Shape | Correction | Cluster Shape | Correction | Cluster Shape | Correction |
|---|
| oo | K = 1.12 | oooo | K = 1.32 | oo
oo | K = 1.17 |
| ooo | K = 1.27 | ooooo | K = 1.45 | o o
o
o o | K = 1.19 |
o
o o | K = 1.16 | oooooo | K = 1.57 | oo
oo
oo | K = 1.17 |
oooooo
o
o | K = 1.64 | ooooooo | K = 1.73 |
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