Question: Friction factor for laminar flow in a slit, use the results of Problem 2B.3 to show that for the laminar flow in a thin slit

Friction factor for laminar flow in a slit, use the results of Problem 2B.3 to show that for the laminar flow in a thin slit of thickness 2B the friction factor is f = 12/Re, if the Reynolds number is defined as Re = 2B(v_z)p/µ. Compare this result for f with what one would get from the mean hydraulic radius empiricism.

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