Method for low velocity measurement of fluid flow

Details Method for low velocity measurement of fluid flow Method for low velocity measurement of fluid flow

1996-10-15

1999-03-09

Chilcot, Richard

Measuring and testing

Volume or rate of flow

By measuring vibrations or acoustic energy

7386123, 7386124, G01F 132

Patent

active

058803777

ABSTRACT:
An apparatus is described which determines the velocity of a fluid flow stream by measuring the frequency of vortex shedding from an obstruction in the fluid flow stream. A constant known as the Strouhal number is used to relate the measured vortex shedding frequency to the fluid flow velocity. The Strouhal number is a function of the Reynolds number for the obstruction, which is also a function of fluid flow velocity. Hence, an iterative technique is provided, first using an estimated Strouhal number to estimate the fluid flow velocity, using the estimated fluid flow velocity to estimate the Reynolds number, then using the Reynolds number to get a better estimate of the Strouhal number. The apparatus repeats this cycle until the estimate of the fluid flow velocity converges.

REFERENCES:
patent: 3564915 (1971-02-01), Tomota et al.
patent: 3775673 (1973-11-01), Watanabe
patent: 3948097 (1976-04-01), Kurita et al.
patent: 4350047 (1982-09-01), Dewey, Jr. et al.
patent: 4448081 (1984-05-01), Kolitsch et al.
Roshko, A., "On the Development of Turbulent Wakes from Vortex Streets," NACA Report 1191, 1955, pp. 1-25.

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