Question: Water at (20{ }^{circ} mathrm{C}) flows down a vertical pipe with no pressure drop. Find the range of pipe diameters (D) (if any) for which

Water at $20{ }^{\circ} \mathrm{C}$ flows down a vertical pipe with no pressure drop. Find the range of pipe diameters $D$ (if any) for which the flow is definitely laminar.

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