For laminar flow of a fluid through a packed bed of spheres of diameter
d, the pressure drop per unit length of bed depends upon the sphere
diameter as
(A) d
(B) d
2
(C) d
4
(D) d
d, the pressure drop per unit length of bed depends upon the sphere
diameter as
(A) d
(B) d
2
(C) d
4
(D) d