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Title: Flow Measurement By Vortex Shedding Meters
Author: Bill Gotthardt
Source: 1998 International School of Hydrocarbon Measurement
Year Published: 1998
Abstract: The vortex shedding phenomenon is nothing new. It occurs in nature. The first recorded observation was by Leonardo Di Vinci more than 400 years ago when he noted the formation of vortex swirls downstream of a rock in a stream of water. At that time, while interesting to observe, the phenomenon was of no practical value. It required modern electronics to make some use of the information. When a flowing medium strikes a non-streamlined object or obstruction, it separates and moves around the object and passes on downstream. At the point of the contact with the object, known as a bluff body or shedder bar, vortex swirls or eddy currents separate from the object on alternating sides. When this occurs - the separation or shedding causes an increase in pressure and a decrease in velocity on one side of the object, and a decrease in pressure with corresponding increase in velocity on the other side of the object. After shedding from one side, the process is reversed and a swirl or vortex is shed on the other side of the object.

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