At the same mean velocity, what is the ratio of head loss per unit length for a sewer pipe flowing full to that for the same pipe flowing half full ?
A. 2.0 B. 1.7 C. 1.0 D. 0.6
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head loss due to friction/unit length of pipe is proportional to mean velocity square V² and inversely proportional to diameter D of the pipe.
V = volumetric flow rate.. remains same
So head loss due to friction : ratio when flowing full / when flowing half full = 1
V = volumetric flow rate.. remains same
So head loss due to friction : ratio when flowing full / when flowing half full = 1
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