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Title: Uncertainty In Primary Gas Flow Standards Due To Flow Work Phenomena
Author: John D. Wright, Aaron N. Johnson
Source: Flomeko 2000
Year Published: 2000
Abstract: Static gravimetric and static volumetric gas flow standards are both affected by uncertainty components related to the measurement of the change of mass of gas within the inventory volume. In the process of diverting gas into the collection vessel, rapid pressure and temperature changes occur in the inventory volume. A low uncertainty gas flow standard requires thorough understanding of these transients so that appropriate instrumentation, system design, and operating procedures may be developed. A thermodynamic model for the flow work phenomena is presented and compared to experimental measurements and strategies for minimizing their effects on flow uncertainty are discussed.

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