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Title: The Swirlmeter For Natural Gas
Author: John G. Kopp
Source: 1970 American School of Gas Measurement Technology
Year Published: 1970
Abstract: It has been observed that a rotating body of fluid will precess when the flow is introduced into an enlargement. This has the general name of Vortex Precession (a hydrodynamic oscillatory motion). Initially, the vortex center, the axis of fluid rotation, is the center line of the meter, but a change in the axis of rotation occurs (precession) when the rotating body of fluid enters an enlargement. It has also been observer that the frequency of the precession is proportional to the volumetric flowrate. The Swirlmeter provides the means to generate the vortex, develop the precession, and defect the frequency of precession. Figure 2 is a cross-sectional view of the Swirlmeter and shows the various components necessary for the development and detection of vortex precession.

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