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|Author(s):||John D. Wright;|
|Title:||Performance of Critical Flow Venturis under Transient Conditions|
|Published:||April 13, 2010|
|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|
|Keywords:||blow-down test, critical flow venture, critical nozzle, fuel dispenser, transient flow|
|Research Areas:||Process Metrologies, Metrology, Flow|
|PDF version:||Click here to retrieve PDF version of paper (408KB)|