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Title: Proposal Of Fluid Dynamical Standard Fds() For Gas Flow-Rate
Author: Masahiro Ishibashi
Source: 2002 International Symposium on Fluid Flow Measurement
Year Published: 2002
Abstract: There is no exception, when establishing a flow-rate standard, to employ a mass or volume measurement together with a time measurement to follow its definition exactly. Of course, the gas flow-rate standard is involuved in the same situation, but it has a uniqueness that the values established by the primary standards are transferred to the next levels via critical flow Venturi nozzles (CFVNs) in almost all cases. Therefore, CFVNs are practically controlling the qualities of almost all gas flow-rate measurements in the fields. Based on experiences at NRLM (now re-organized as AIST) on CFVNs for more than a decade, the author proposes here a new gas flow-rate standard system, which is flowing from CFVNs themselves. In this new system, the quantity flow-rate is calculated from one of the most important parameter of the flow itself, that is, flow velocity. Therefore, the quantity gas flow-rate will have escaped from being derived from basic units far from the nature of flow. The new standard will be named as Fluid Dynamical Standard (FDS), since the quantity is derived from the fluid dynamics.

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