Determine the flow rate of water in a pipe with a diame

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Determine the flow rate of water in a pipe with a diameter of 250 mm, which has a smooth narrowing to a diameter of 125 mm, if the readings of the piezometers of a Venturi flowmeter: before narrowing 50 cm; after narrowing 30cm. neglect the pressure loss. How to change the flow rate of a fluid in a pipe if the pipe diameter is reduced tenfold so that the Reynolds criterion remains unchanged?
Given: D = 250mm = 0.25m; d = 125mm = 0.125m; h1 = 50cm = 0.5m; h2 = 30cm = 0.3m
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