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Title: I Nfluence Of Non - Developed Flow Condition On Uncertainty Of Flowrate Measurement Using Ultrasonic Doppler Velocity Profile Method
Author: Sanehiro Wada Noriyuki Furuichi
Source: 2015 International Symposium on Fluid Flow Measurement
Year Published: 2015
Abstract: To obtain an uncertainty of flowrate measurement using ultrasonic Doppler velocity profile method (UVP) , experiments are carried out in a disturbed flow. Flowrate measurement is based on a multi - path measurement using three ultrasonic transducers. To gener ate the disturbed flow, obstacle plates are installed upstream of the test section. The maximum difference from the reference flowrate given by the national standard calibration facility of water flowrate is over 2% when the measurement is performed at 8 D downstream of the obstacle plate. At 25 D downstream of the obstacle plate, the deviation is within the fundamental uncertainty level. The relative expanded uncertainties ( k 2) are estimated to be 1.2% for 25 D , 2.4% for 16 D and 2.9% for 8 D , respectively




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