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Title: Improved Meter-Factor Corrections For Turbine And Vortex Shedding Flow Meters
Author: G. E. Mattingly
Source: American Gas Association 2009
Year Published: 2009
Abstract: Increasingly, in todays world, flow meters are being used over extremely wide ranges of conditions, not only temperature and pressure, but also fluids, viscosities, and densities. Such ranges make it impossible to calibrate a meter for all of these conditions. Therefore, after any calibration, meters should be characterized using dimensionless parameters. Dimensionless characterizations of flow meter performance, when done appropriately, are superior to dimensional characterizations since they more completely encapsulate the salient physical phenomena that affect meter performance. However, such dimensionless parameters that are based on specific, selected characteristic quantities, i.e., length scales, velocities, fluid properties, and meter outputs, are not unique and therefore beg the question: Which parameters are best? Furthermore, while conventional dimensionless characterizations have generally produced satisfactory performance predictions when the conditions are not very different from those of the calibration, these characterizations can break down when usage conditions are very different and especially where the internal meter components have different materials with different thermal expansion coefficients. In such cases, there are three options: 1) try different selections of the dimensionless parameters, using the same characteristic quantities 2) look for different, more appropriate choices for the characteristic quantities, using the same dimensionless parameters 3) attempt a characterization using one or more additional dimensionless parameters.

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