Abstract
The existing MI 1538-86 recommendation regarding the measurement of mass flow rate using critical nozzles is analyzed. It is shown that there are contradictions between the MI 1538-86 recommendations and the conditions for the conservation of mass, energy and momentum, due to the simplified assumptions made, which introduces a systematic error into measurements of mass flow rate.
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REFERENCES
MI 1538-86 MU, GSI, Critical flow meters. Procedure for measuring the mass flow rate of a gas.
ISSN 0341-7964. PTB Testing Instructions. Vol. 25.
State Standard GOST 30319-96, Natural gas. Methods of calculating physical properties. Interstate Committee on Standardization, Metrology and Certification.
State Standard GOST 8.563-97, GSI, Measurement of flow rate and quantity of liquids and gases by the variable pressure drop method. Diaphragms, ISA 1932 nozzles and Venturi tubes placed in filled pipelines of circular cross section. Technical conditions. Interstate Committee on Standardization, Metrology and Certification.
V. A. Kirpikov and N. B. Kondukov, Principles of Flow Thermodynamics. A Student Textbook [in Russian], MIKhM, Moscow (1961).
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Belyaev, B.M., Vagin, V.V. & Patrikeev, V.G. An Analysis of Existing Methods of Measuring Mass Flow Rate Using Critical Nozzles. Measurement Techniques 45, 519–523 (2002). https://doi.org/10.1023/A:1020020123286
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DOI: https://doi.org/10.1023/A:1020020123286