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If the packing density (α) is defined as the volume of the fiber unit volume of filter bed, the velocity within the filter void space is equal to (where V is velocity in fluid void space and V0 is undisturbed fluid velocity)

V = V0/(1-α)
V-V0 = 1 - α
V = V0(1 - α)
V = V0/(1 + α)

Correct Answer: V = V0/(1-α)

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