lab2_lecture - ,velocityprofile...

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Measurement of flow rate, velocity profile  and friction factor in Pipe Flow S. Ghosh, M. Muste, M. Marquardt, F. Stern
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Overview  Purpose  Experimental design  Experimental Process Test Set-up Data acquisition Data reduction Uncertainty analysis Data analysis
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Purpose  Provide hands-on experience with pipe stand facility and  modern measurement systems including pressure transducers,  pitot probes and computer data acquisition and data reduction. Comparison between automated and manual data acquisition  systems.  Measure flow rate, velocity profiles and friction factor in    smooth and rough pipes.  Determine experimental uncertainties.  Compare results with benchmark data
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Experimental Design The facility consists of: Closed pipe network Fan Reservoir  Instrumentation: 3 Venturi meters  Simple water Manometer Differential Water manometer Pitot Probe Digital Micrometer  (Accurate radial positioning) Pressure transducer   Computer based Automated Data Acquisition System (DA)  Contraction Diameters (mm): 12.7 25.4 52.93 Flow Coefficient, K 0.915 0.937 0.935
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Experimental process Data Analysis Compare results with benchmark data, CFD, and /or AFD Use Fig 8 as reference value for velocity profile Plot experimental velocity profile and friction factor on reference data Use Fig 9 as reference value for friction factor Evaluate fluid physics, EFD process and UA Answer questions in section 4 Report difference between experimental and reference data Prepare report Data Reduction Statistical analysis Data reduction equations Remove outliers Evaluate Eq. 3 Evaluate Eq. 4 Uncertainty Analysis Estimate bias limits Table 1 Estimate precision limits Evaluate Eq. 9 Evaluate Eq. 13 Estimate total uncertainty Evaluate Eq. 7 Evaluate Eq. 11 Test Set-up Facility & conditions Prepare measurement systems Venturimeter Pressure transducer Valve manifold Pitot tube Micrometer Install model N/A Calibration N/A Data Acquisition Prepare experimental procedures Run tests & acquire data Store data Write results to output file Measure room and pipe temperature Initialize data acquisition software Open Labview program Set blower speed Set valves in proper positions Airflow pipe system Enter hardware settings Measure total discharge Measure velocity profile Measure pressure drop in pipe Repeat discharge measurement Evaluate Eq. 5 Evaluate Eq. 6
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Test set-up
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Test Set-up: Venturi meter and Pitot-tube  housing Venturimeter Pitot-tube housing
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Test set-up Instrumentation The equipment used in the experiment includes : Digital thermometer with a range of – 40 to 450 ° F and a smallest reading of 0.1 ° F for measurement of the environment temperature.
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This note was uploaded on 12/08/2011 for the course MECHANICS 57:020 taught by Professor Fredrickstern during the Fall '10 term at University of Iowa.

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lab2_lecture - ,velocityprofile...

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