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Title: Influence Of Thermodynamic Calculations On The Flow Rate Of Sonic Nozzles
Author: F. Vulovic, E. Vincendeau, , J.P. Vallet, C. Windenberger, O. Villanger, J. Bosio
Source: 1999 International Symposium on Fluid Flow Measurement
Year Published: 1999
Abstract: This paper describes the results of two intercomparisons using a sonic nozzle as the transfer standard. They were initially conducted in line with the activities of EUROMET, a grouping of European flow metering laboratories which were subsequently joined by NOVA, CEESI and SwRI. Two types of comparisons were made, between European and North American gas flow metering installations and between the methods used by those laboratories to calculate the critical flow function C*. The transfer standard used was a critical flow Venturi nozzle. The calculation methods considered were the ISO 9300 standardized equations for dry air and natural gas, the different versions of the AGA8 method, as well as several other methods developed by the laboratories, some of them based on the free energy equation. A comparison of these calculation methods shows that deviations exist in the results found in natural gas and that the deviations are smaller in dry air.

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