SAE 50 oil at 20◦C is introduced uniformly at a volume flow rate of q per unit width at the top of a plane wall as shown in Figure 5.64. The oil ultimately attains a steady velocity profile and a...

SAE 50 oil at 20◦C is introduced uniformly at a volume flow rate of q per unit width at the top of a plane wall as shown in Figure 5.64. The oil ultimately attains a steady velocity profile and a uniform thickness, h. If the thickness of the oil layer is 8 mm, at what rate is oil being added at the top of the wall?