CE3502FluidsLab2 - Pressure and Velocity Measurement Lab...

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Pressure and Velocity Measurement Lab Section 2 Jessica Tello Theresa Gant-Gaines TA: Anwar Chengala September 19, 2011 We attest that this is our own work. October 3, 2011 Purpose The purpose of this experiment is to obtain velocity measurements of flow through a pipe with three different apparatuses. In the first experiment a pipe fitted with a rake of stagnation tubes is used to calculate the local velocities along radial distances. The second experiment analyses flow rate within the tube and a point in the tube where the diameter is decreased using a
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manometer connected to a Venturi meter. The last apparatus used is a Hastings meter which gives a direct reading of the flow rate. The experimental flow rates are then analyzed and compared. Apparatus and Procedure In the first experiment stagnation tubes are used to measure the velocity profile of an air stream flowing through a pipe by initially setting the voltage of the Rheostat to 60V and allowing the fluid in the manometer tubes to reach a steady state. Stagnation and static pressures are recorded, the profile shape observed, and the pressure difference between each stagnation pressure and the static pressure calculated with the equation. The local velocities are calculated using the derivation of Bernoulli’s equation. These local velocities are used to plot the velocity distribution versus radial location of the tube, u(r) vs. r2, and the shape of the profile is discussed as a consequence of viscous wall shear stress. Additionally, the local velocities are plotted versus the radial location squared, u(r) vs. r2. The area under the curve u(r) vs. r2 is integrated using to find the volumetric flow rate. The mean velocity of flow for a cross section is calculated using . The next two experiments are performed with the same voltage and then all three experiments repeated in the same manner with 80V and 100V. The stagnation tubes which most closely match the mean velocities were 0.95 in (0.02413 m), -0.85 in (-0.02159 m), and -0.85 (-0.02159 m) for voltages of 60V, 80V, and 100V respectively.
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This note was uploaded on 11/10/2011 for the course CE 3502 taught by Professor Hill during the Spring '08 term at Minnesota.

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CE3502FluidsLab2 - Pressure and Velocity Measurement Lab...

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