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Fluid Mechanics

Drag on a Sphere

A very small ...

Question

A very small spherical particle of sand settles in a column of viscous liquid . If the Reynolds number corresponding to its terminal velocity is 0.25, the drag coefficient of the sand particle is :

A

256

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B

128

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C

96

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D

64

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Solution

The correct option is C 96
$C_{D} = \frac{24}{R e} = \frac{24}{0.25} = 96$

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