Fluid Mechanics FE Review Fluid Mechanics FE ... - Inside Mines

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PPI Fluid Mechanics Fluid Measurements Venturi Meters – measures the flow rate in a pipe system • The changes in pressure and elevation determine the flow rate. In this diagram, z 1 = z 2, so there is no change in height. Fluid Mechanics Fluid Measurements Orifices Professional Publications, Inc. Professional Publications, Inc. 9-10c FERC 9-10e FERC 22
PPI Orifice Flow 16. Water flows out of a tank at 12.5 m/s from an orifice located 9m below the surface. The crosssectional area of the orifice is 0.002 m 2 , and the coefficient of discharge is 0.85. What is the diameter D, at the vena contracta? Similitude (A) 4.2 cm (B) 4.5 cm (C) 4.7 cm (D) 4.8 cm Professional Publications, Inc. In other words… Dimensionless parameters must be equal between the model and prototype (Each dimensionless parameter is a ratio of different types of forces being exerted on the fluid) For example: For completely submerged models/prototypes and pipe flow, the Reynolds numbers must be equal For Weirs, dams, ships, and open channels, the Froude numbers must be equal FERC FERC 23
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