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Title: The Humidity Effect On The Calibration Of Discharge Coefficient Of Sonic Nozzle By Means Of Pvtt Facility
Author: Chunhui Li,Bodo Mickan
Source: 2012 International Symposium on Fluid Flow Measurement
Year Published: 2012
Abstract: When the pVTt facility was used to calibrate the discharge coefficient of sonic nozzle, the initial pressure was usually as low as possible to reduce the uncertainty. The atmospheric air with humidity was working fluid in NIM, which was used to calibrate the discharge coefficient of sonic nozzle. In a series of experiments, it became obviously that the calibration result of sonic nozzles determined by means of pVTt facility was depending on the initial pressure in the collection vessel if humid air was in use. The experimental facts and discusses two possibilities of physical reason for this effect was presented in this paper.

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