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Title: Fluidic Oscillation Measurement
Author: Andrew Carver
Source: American Gas Association 2000
Year Published: 2000
Abstract: The scientific community has known about Fluidic Oscillation as a measurement technology for many years. Recent advances in this technology now make this a highly robust, costeffective solution to metering needs. This paper will discuss the advances and benefits. Based on Bernoullis Theory - A slow moving high pressure gas becomes fast moving low pressure gas at the nozzle exit forming a jet of gas. The jet, once formed can be controlled by the Coanda effect using an obstacle in the flow that is designed to optimize the performance of the meter. Controlling the jet path enables formation of feedback nodes of pressure on either side of the jet. This provides a predictable oscillation of the jet. The metrology of the meter is only related to the mechanical design of the oscillation chamber and flow tranquilizer. The jet oscillations are detected using a thermo-resistive sensing device, which provides the data to the electronic index. In addition to the commonly known benefits of static metering technology (no moving parts and the possibility of integrated volume conversion and AMR), fluidic oscillation provides high rangeability in a robust design that tolerates unclean gas.

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