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Title: Bilateral Comparison between NIM and NMIA for Air Flowrates from 2 m/h to 128 m/h
Author: Dr Chunhui Li, Dr Khaled Chahine, Mr Zhe Wang
Source: 2018 International Symposium on Fluid Flow Measurement
Year Published: 2018
Abstract: A bilateral comparison was conducted between NIM and NMIA using three critical flow Venturi nozzles (or sonic nozzles) with nominal diameters of 1.919 mm, 7.453 mm and 15.071 mm. The comparison was conducted using stagnation pressures ranging from 70 kPa to 600 kPa equating to a flow range from 2 m/h to 128 m/h at atmospheric pressures. All nozzles were measured firstly using the pVTt facility at NIM and then compared to the measurements by NMIA obtained by their standards consisting of a bell prover and arrays of sonic nozzles. Using the En ratio to evaluate the results, it was found that 21 out of 22 sets of measurements were in agreement with En ratio values less than unity. Further investigations are continuing to evaluate the measurement set with En ratio greater than unity.

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