Question 2: A pressure difference AP is suddenly imposed across a rectangular channel of length L width w and height h where h « w « L./6 (a) Estimate the

Reynolds number of the flow for a fluid of density p and viscosity µ. (b) Estimate the time scale ↑ over which the flow is unsteady. (c) Estimate the magnitude of the viscous traction on the walls of the channel.

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