Question: A number of straight 25-cm-long microtubes, of diameter d, are bundled together into a honeycomb whose total cross-sectional area is 0.0006 m2. The pressure drop

A number of straight 25-cm-long microtubes, of diameter d, are bundled together into a “honeycomb” whose total cross-sectional area is 0.0006 m2. The pressure drop from entrance to exit is 1.5 kPa. It is desired that the total volume flow rate be 1 m3/h of water at 20°C.
(a) What is the appropriate microtube diameter?
(b) How many microtubes are in the bundle?
(c) What is the Reynolds number of each microtube?

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