Investigation of the discharge coefficient in the laminar boundary layer regime of critical flow Venturi nozzles calibrated with different gases including hydrogen

Bobovnik, Gregor (author), Mickan, Bodo (author), Sambol, Peter (author), Maury, Rémy (author), Kutin, Jože (author)

This study represents the first step towards the introduction of critical flow Venturi nozzles into the traceability scheme for gaseous hydrogen and addresses the characterisation of the hydrogen discharge coefficient in the laminar boundary layer regime and the identification of a potential alternative gas for nozzle calibration. The experimental study presented was performed for two nozzles with a throat diameter of 0.175 mm and 0.436 mm. The tests were performed with six different gases, including hydrogen, covering a Reynolds number range from 1.5⋅10$^3$ to 6⋅10$^4$. The experimental results show that the discharge coefficient depends not only on the Reynolds number but also on the isentropic exponent of the gas. Based on the experimental data, theoretical models taking into account the isentropic exponent and the Prandtl number of the gas were evaluated. The study indicates possibilities to use inert gases instead of hydrogen in calibration processes.

• Language: English
• Keywords: critical flow Venturi nozzle, discharge coefficient, experimental analysis, hydrogen flow
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: FS - Faculty of Mechanical Engineering
• Publication status: Published
• Publication version: Version of Record
• Year: 2023
• Number of pages: 7 str.
• Numbering: Vol. 217, art. 113134
• PID: 20.500.12556/RUL-146672
• UDC: 532:681.122
• ISSN on article: 1873-412X
• DOI: 10.1016/j.measurement.2023.113134
• COBISS.SI-ID: 154551299
• Publication date in RUL: 06.06.2023

BOBOVNIK, Gregor, MICKAN, Bodo, SAMBOL, Peter, MAURY, Rémy and KUTIN, Jože, 2023, Investigation of the discharge coefficient in the laminar boundary layer regime of critical flow Venturi nozzles calibrated with different gases including hydrogen. Measurement [online]. 2023. Vol. 217,  113134. [Accessed 26 April 2025]. DOI 10.1016/j.measurement.2023.113134. Retrieved from: https://repozitorij.uni-lj.si/IzpisGradiva.php?lang=eng&id=146672

Record is a part of a journal

• Title: Measurement
• Publisher: Elsevier, International Measurement Confederation
• ISSN: 1873-412X
• COBISS.SI-ID: 23272709

Licences

• License: CC BY 4.0, Creative Commons Attribution 4.0 International
• Link: http://creativecommons.org/licenses/by/4.0/
• Description: This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.

Secondary language

• Language: Slovenian
• Keywords: kritične Venturijeve merilne šobe, pretočni koeficient, eksperimentalne analize, pretok vodika

Projects

• Funder: Other - Other funder or multiple funders
• Funding programme: EMPIR
• Project number: 20IND11
• Name: Metrology infrastructure for high-pressure gas and liquified hydrogen flows
• Acronym: MetHyInfra

• Funder: EC - European Commission
• Funding programme: H2020
• Acronym: EMPIR