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

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

Abstract

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.

Keywords

kritične Venturijeve merilne šobe;pretočni koeficient;eksperimentalne analize;pretok vodika;critical flow Venturi nozzle;discharge coefficient;experimental analysis;hydrogen flow;

Data

Language:	English
Year of publishing:	2023
Typology:	1.01 - Original Scientific Article
Organization:	UL FS - Faculty of Mechanical Engineering
UDC:	532:681.122
COBISS:	154551299
ISSN:	1873-412X
Views:	253
Downloads:	58
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	Slovenian
Secondary keywords:	kritične Venturijeve merilne šobe;pretočni koeficient;eksperimentalne analize;pretok vodika;
Type (COBISS):	Article
Pages:	str. 1-7
Issue:	ǂVol. ǂ217
Chronology:	Aug. 2023
DOI:	10.1016/j.measurement.2023.113134
ID:	19173263