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Unformatted text preview: Fluid Mechanics (CLD 10603) Experiment 2: Method of Flow Measurement Experiment 2 Method of Flow Measurement Objective Direct comparison of flow measurement using venturi, orifice and bench. Overview In engineering and industrial practice, fluid measurement of many of the variables and properties, such as density, viscosity, pressure, velocity, flow rate and etc is one of the problems most frequently encountered by engineers. It is therefore essential for engineers to be well equipped with knowledge of the fundamentals and existing methods of measuring various fluid properties and phenomena. This apparatus is specially designed to obtain the flow rate measurement by utilizing three basic types of flow measuring techniques, which are float‐type flow meter, venturi meter and the orifice meter. Experimental Procedure 1. 2. 3. 4. 5. 6. Connect measurement lines. Open all valves at pipe section and the six tubes manometer. Switch on the pump and let the water flow for one minute or until all air has been expelled from the pipe work, then switch off the pump. Close both the inlet and flow control valves. Let the vent and drain valves of the six tubes manometer opened. Now immediately close vent and drain valves. Adjust the height of the manometer tubes by slightly opening and closing vent and drain valves until the height of the manometer become 150 mm. 1 Fluid Mechanics (CLD 10603) Experiment 2: Method of Flow Measurement 7. 8. Switch on the pump and open inlet valve slowly. Adjust the height of the water in the manometer tubes with the help of flow control valve until you get the difference in levels between each manometer. 9. 10.
Record the flow rate shown by the rotameter. Without adjusting any valves, convey the water outlet hose into a container whose capacity is known and record the time taken for the water to fill it up. Record manometer readings in the sample reading table. 11. 12. Repeat step 8 to 11 for other flow rate. Figure 1: Flowmeter Apparatus 2 Fluid Mechanics (CLD 10603) Experiment 2: Method of Flow Measurement Results Manometer Reading (mm) Rotameter Rotameter (L/hr) (L/min) 1 Given: V = αεAd Where: Δp = Δhρg Constant: k = 240 litre h mbar for Venturi meter Manometer Reading (mm) 2 3 4 5 6 Vol. (L) Flowrate Q Time (L/min) (s) Flowrate calculated using Bernoulli’s Eq. (L/min) Venturi Orifice 2Δp ρ = k Δp with Δh = h1‐h2 k = 293 litre h mbar for Orifice ρwater = 1000 kg/m3 3 Fluid Mechanics (CLD 10603) Experiment 2: Method of Flow Measurement Discussion 4 Fluid Mechanics (CLD 10603) Experiment 2: Method of Flow Measurement Tutorial 1. 2. What size standard orifice is required to discharge 0.016 m3/s of water under a head of 8.69 m? Assume Cd = 1.00 Qactual = c d Aorifice What are the limitations of Bernoulli’s Theorem? 2 gh 5 Fluid Mechanics (CLD 10603) Experiment 2: Method of Flow Measurement 3. When the flow of water through a horizontal 300 mm by 150 mm Venturi meter (Cd = 0.95) is 0.111 m3/s, find the deflection of the mercury in the differential gauge attached to the meter. Qactual = C d A1 A2 ⎛ρ ⎞ 2 gh⎜ man − 1⎟ ⎜ρ ⎟ ⎝ ⎠ 2 2 A1 − A2 6 Fluid Mechanics (CLD 10603) Experiment 2: Method of Flow Measurement Conclusion References 1. John F. Douglas (2001). Fluid Mechanics. 4th Edition , Prentice Hall 2. Joseph B. Franzini (2002). Fluid Mechanics. 10th Ed. McGrawHill 3. Noel de Nevers (1991). Fluid Mechanics for Chemical Engineers. 2nd Ed. McGraw Hill 4. John A. Roberson (2001). Engineering Fluid Mechanics. Wiley 7 ...
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This note was uploaded on 05/08/2011 for the course ACCOUNTING 121210 taught by Professor Sdasdas during the Spring '10 term at Albany College of Pharmacy and Health Sciences.
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