Lecture%2021_Flow%20Measurement

Lecture%2021_Flow%20Measurement - ME309 Fall 2009 Lecture...

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Unformatted text preview: ME309 Fall 2009 Lecture 21: Flow Measurement Andrew Lee Maurice J. Zucrow Laboratories Purdue University West Lafayette, Indiana Flow Measurements Ways to measure flow rate and velocity of a flow: Direct method Restriction flow meter Linear flow meter Traversing method (local velocity) 10/28/2009 Andrew Lee 2 Direct Methods Measure the amount of fluid that accumulates in a container over a fixed time period Stopwatch-and-bucket Positive displacement flow meters 10/28/2009 Andrew Lee 3 Restriction Flow Meters Based on acceleration of a fluid stream through some form of nozzle The measured output is the pressure drop (or differential pressure) Orifice meter Flow nozzle Venturi meter 10/28/2009 Andrew Lee 4 Restriction Flow Meters 10/28/2009 Andrew Lee 5 Linear Flow Meter Measured output is directly proportional to the flow rate Requires calibration Float meter (rotameter) Turbine flow meter Vortex flow meter Electromagnetic flow meter Ultrasonic flow meter 10/28/2009 Andrew Lee 6 Traversing Method When the cross-section of the flow or the flow rate is too large, it is impractical to use the aforementioned methods In such case, local velocities are measured to estimate the flow rate Pitot and pitot-static probe Laser Doppler anemometry (LDA) 10/28/2009 Andrew Lee 7 ...
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Lecture%2021_Flow%20Measurement - ME309 Fall 2009 Lecture...

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