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Category > Engineering Posted 23 May 2017 My Price 6.00

he flow through a closed, circular-sectioned pipe may be metered by measuring

The flow through a closed, circular-sectioned pipe may be metered by measuring the speed of rotation of a propeller having its axis along the pipe centre-line. Derive a relation between the volume flow rate and the rotational speed of the propeller, in terms of the diameters of the pipe and the propeller and of the density and viscosity of the fluid. A propeller of 75 mm diameter, installed in a 150 mm pipe carrying water at 42.5 L ·s−1, was found to rotate at 130 rad ·s−1 (20.7 rev/s). If a geometrically similar propeller of 375 mm diameter rotates at 64.5 rad ·s−1 (10.9 rev/s) in air flow through a pipe of 750 mm diameter, estimate the volume flow rate of the air. The density of the air is 1.28 kg · m−3 and its dynamic viscosity 1.93 × 10−5 Pa ·s. The dynamic viscosity of water is 1.145 × 10−3 Pa ·s.

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Alpha Geek
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Status NEW Posted 23 May 2017 10:05 AM My Price 6.00

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file 1495535407-Answer.docx preview (193 words )
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