Wright, J.
(2010),
Performance of Critical Flow Venturis under Transient Conditions, Measurement Science & Technology, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=904378
(Accessed January 22, 2025)
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Performance of Critical Flow Venturis under Transient Conditions
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Abstract
Critical flow venturis (CFVs) can be used to measure flow under transient pressure and flow conditions with uncertainties of 0.13 % or less (95 % confidence level). Blow-down tests transferred 630 g of nitrogen during a 100 s interval from an unregulated cylinder (initially at 10 MPa) through a heat exchanger and a CFV into a known collection volume. Fast pressure and temperature sensors were used to calculate the CFV flow. The integrated CFV mass flows, , averaged 0.04 % smaller than the mass V of the collected gas. The heat exchanger was essential to the excellent agreement; without it, the percentage difference between and V was 0.38 %. We conclude that even under transient conditions, a properly instrumented CFV can be used as a reference flowmeter to evaluate other flowmeter types or to test gaseous fuel dispensers in the field.Citation
Measurement Science & Technology
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Journals
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Keywords
blow-down test, critical flow venture, critical nozzle, fuel dispenser, transient flow
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Created April 13, 2010, Updated February 19, 2017