Incompressible steady flow in the inlet between parallel plates in Fig P3.17 is uniform, u = Uo = 8 cm/s, while downstream the flow develops into the parabolic laminar profile u = az (zo − z), where a is a constant. If zo = 4 cm and the fluid is SAE 30 oil at 20°C, what is the value of umax in cm/s?

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