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Title: Compressible Flow Effects In Subsonic Venturis
Author: Thomas Kegel
Source: 1999 International Symposium on Fluid Flow Measurement
Year Published: 1999
Abstract: When a subsonic venturi is used to measure the flow of a compressible fluid there will be a density difference between the two pressure taps. This effect needs to be accounted for by a term called the gas expansion factor. A theoretical gas expansion factor is traditionally applied to measurements made with a venturi element. The degree to which the theoretical value is applicable to a particular venturi depends on the design as well as the flow conditions. In some cases a meter specific gas expansion factor must be determined. This paper describes the process for determining gas expansion factor based on calibration data. A test plan has been developed and applied to two different devices. The effects of Mach number, Reynolds number and gas species are described. Calibration data from both devices are presented and discussed.

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