A centrifugal filtration unit operating at a rotational speed of w has inner surface of the liquid (density ?L) located at a radial distance R from the axis of rotation. The thickness of the liquid film is ? and no cake is formed. The initial pressure drop during filtration is ___________________?
A. w2 . ??L (2R + ?)

B. w2 . ?2 . ?L

C. w2 . R . ?L(R + 2?)

D. w2 . R2 . ?L

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