Задача id10714

Reservoirs A and B with water are connected by a horizontal pipeline consisting of pipe sections with diameters d1 = 100 mm and d2 = 60 mm and having a tap with a local loss coefficient ev = 5 (Fig.). Other losses can be neglected. The difference in liquid levels in the tanks H = 3 m. Determine the liquid flow rate in the pipeline Q. What should be the local loss coefficient ev so that the liquid flow rate doubles?

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