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Title: Errors in Rate-of-Rise Gas Flow Measurements from Flow Work
Author: John D. Wright Aaron N. Johnson Michael R. Moldover Gina M. Kline
Source: 2018 International Symposium on Fluid Flow Measurement
Year Published: 2018
Abstract: The rate-of-rise (RoR) method determines flow by measuring the time rate of change of the amount of gas in a collection tank of known volume as it is filled via a flow meter under test. The mass of gas is calculated from time-stamped pressure and temperature data and accurate RoR measurements require reliable gas pressure and temperature values while the collection tank is filling with gas. We present a thermodynamic model and experimental measurements of gas temperature errors that are a function of a dimensionless ratio related to: the heat transfer from the gas to its surroundings / the heat generated by flow work. The uncertainty of RoR flow measurements made using the NIST 34 L collection tank is 0.12 % for flows between 1 sccm? and 200 sccm. At lower and higher flows, the RoR uncertainty rises to approximately 1 % due to leaks and temperature errors induced by flow work.

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