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Title: Evaluation Of Theoretical Cfv Flow Models In The Laminar, Turbulent, And Transition Flow Regimes
Author: Aaron Johnson, John Wright
Source: 2006 International Symposium on Fluid Flow Measurement
Year Published: 2006
Abstract: State of the art dimensional metrology was used to measure the throat diameter and throat curvature of nine critical flow venturis (CFVs) with nominal throat diameters ranging from 5 mm to 25 mm. The throat curvature was used calculate the theoretical discharge coefficients while the throat diameter was used to compute the experimental discharge coefficients. The nine CFVs were calibrated in dry air using two NIST primary flow standards with expanded uncertainties of 0.05 % and 0.09 %, respectively. The calibration data spans a Reynolds number range from 7.2 104 to 2.5 106, including laminar, turbulent, and transition flow regimes. By correcting for both the throat diameter and curvature, the agreement between predicted and measured discharge coefficients was less than 0.17 % in the turbulent regime and less than 0.07 % in the laminar regime.

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