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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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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 .