Chapter 9
Q. 9.1
Lycopodium spores with diameter 4.2 µm have a sedimentation velocity in air of 0.50 mm s^{-1}. Estimate their drag coefficient.
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Verified Solution
As Re_{p} is small ( Re_{p} = 0.5 \times 10^{-3} \times 4.2 \times 10^{-6} / 15\times 10^{-6} = 0.14 \times 10^{-3} ), use the relation c_{d} = 24 / Re_{p} = 171 .