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Title: The Vortex Shedding Insertion Flowmeter Its Uses In The Gas Industry
Author: Kenneth L. Guenther
Source: 1975 Appalachian Gas Measurement Short Course
Year Published: 1975
Abstract: The cost of large full line size meters is initially high and rises significantly in relation to increasing size. In cases where flow control or other operations where repeatability is the prime factor desired in a measurement, an insertion type flowmeter can present a viable alternative. The insertion device further described in this paper measures velocity based on vortex shedding. Vortex shedding is the name given to the natural effect that can occur when a gas or a liquid flows around a blunt or non-streamlined object. A fixed bluff object of a particular shape is placed inside a circular shroud and that assembly is inserted into the duct where velocity is to be measured. If the inserted assembly has the correct relative dimensions, vortex shedding from the fixed, bluff object (flow element) will occur in a steady, regular fashion, at a frequency proportional to the fluid velocity. It is important to note that vortex shedding occurs by virtue of the flow itself - no moving mechanical parts are involved. The resulting flow pattern, which is shown in schematic form in Figure 1, results in an oscillatory motion of the flowing fluid, at the frequency of vortex shedding.

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