In the gap between the two plates, the lubricant flows in one direction (x) by the pressure gradient. Lubricants are incompressible Newtonian fluids, flows are laminates, and terminal effects are ignored. Find the maximum flow rate [m/s] when the pressure difference (△P/L) per unit length is 25000 Pa/m. Data: clearance between plates (B) = 6 mm, lubricant viscosity (μ) = 25 cP (1cP = 10-3 Pa·s), lubricant density (=) = 0.88 g/cm3

Elements Of Electromagnetics
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Publisher:Sadiku, Matthew N. O.
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In the gap between the two plates, the lubricant flows in one direction (x) by the pressure gradient. Lubricants are incompressible Newtonian fluids, flows are laminates, and terminal effects are ignored. Find the maximum flow rate [m/s] when the pressure difference (△P/L) per unit length is 25000 Pa/m.
Data: clearance between plates (B) = 6 mm, lubricant viscosity (μ) = 25 cP (1cP = 10-3 Pa·s), lubricant density (=) = 0.88 g/cm3

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Why Umax=12μ?

i could'nt understand 'Umax=12μ∆PLB24=1225×10-3250000.00624Umax=4.5 m/s'

this sentence 

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