Question: Ethanol at 20C flows at 125 U.S. gal/min through a horizontal cast-iron pipe with L = 12 m and d = 5 cm. Neglecting entrance

Ethanol at 20°C flows at 125 U.S. gal/min through a horizontal cast-iron pipe with L = 12 m and d = 5 cm. Neglecting entrance effects, estimate (a) the pressure gradient, dp/dx;
(b) The wall shear stress, τw; and (c) the percent reduction in friction factor if the pipe walls are polished to a smooth surface.

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For ethanol Table A3 take 789 kgm3 and 00012 kgm s Convert 125 galmin ... View full answer

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