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

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

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.

• Jezik: Angleški jezik
• Ključne besede: critical flow Venturi nozzle, discharge coefficient, experimental analysis, hydrogen flow
• Vrsta gradiva: Članek v reviji
• Tipologija: 1.01 - Izvirni znanstveni članek
• Organizacija: FS - Fakulteta za strojništvo
• Status publikacije: Objavljeno
• Različica publikacije: Objavljena publikacija
• Leto izida: 2023
• Št. strani: 7 str.
• Številčenje: Vol. 217, art. 113134
• PID: 20.500.12556/RUL-146672
• UDK: 532:681.122
• ISSN pri članku: 1873-412X
• DOI: 10.1016/j.measurement.2023.113134
• COBISS.SI-ID: 154551299
• Datum objave v RUL: 06.06.2023

Gradivo je del revije

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

Licence

• Licenca: CC BY 4.0, Creative Commons Priznanje avtorstva 4.0 Mednarodna
• Povezava: http://creativecommons.org/licenses/by/4.0/deed.sl
• Opis: To je standardna licenca Creative Commons, ki daje uporabnikom največ možnosti za nadaljnjo uporabo dela, pri čemer morajo navesti avtorja.

Sekundarni jezik

• Jezik: Slovenski jezik
• Ključne besede: kritične Venturijeve merilne šobe, pretočni koeficient, eksperimentalne analize, pretok vodika

Projekti

• Financer: Drugi - Drug financer ali več financerjev
• Program financ.: EMPIR
• Številka projekta: 20IND11
• Naslov: Metrology infrastructure for high-pressure gas and liquified hydrogen flows
• Akronim: MetHyInfra

• Financer: EC - European Commission
• Program financ.: H2020
• Akronim: EMPIR