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Water to a residential area is transported at a rate of 1.5 m3/s via 70-cm-internal-diameter concrete...

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Physics

Water to a residential area is transported at a rate of 1.5m3/s via 70-cm-internal-diameter concrete pipes with asurface roughness of 3 mm and a total length of 1520 m. In order toreduce pumping power requirements, it is proposed to line theinterior surfaces of the concrete pipe with 2-cm thickpetroleum-based lining that has a surface roughness thickness of0.04 mm. There is a concern that the reduction of pipe diameter to66 cm and the increase in average velocity may offset any gains.Taking ρ = 1000 kg/m3 and v = 1 ×10–6 m2/s for water, determine the percentincrease or decrease in the pumping power requirements due to pipefrictional losses as a result of lining the concrete pipes. (Roundthe final answer to one decimal place.)

Answer & Explanation Solved by verified expert
4.0 Ratings (849 Votes)
Area of pipe before lining A pi 4 d2 pi 4072 A 03848 m2 Average velocity of flow V Q A V 150 03848 3898 ms Reyynolds number Re Vd v Re 3898070 1106 2728106 Re 4000 so    See Answer
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