T-shape vortex shedder wherein the bluff body extends across the

Details T-shape vortex shedder wherein the bluff body extends across the T-shape vortex shedder wherein the bluff body extends across the

1993-08-31

1994-10-04

Chilcot, Jr., Richard E.

Measuring and testing

Volume or rate of flow

By measuring vibrations or acoustic energy

7386122, G01F 132

Patent

active

053515595

ABSTRACT:
A T-shape vortex shedder comprises a bluff body having a width W between upper and lower ends thereof and an extended plate having a length L in the fluid flow direction which is perpendicular to the bluff body. The bluff body and the extended plate form a T-shape vortex shedder with a T-shape cross section. When this T-shape vortex shedder is placed in a fluid motion within a circular pipe, the bluff body is located upstream of the fluid flow, and the extended plate is located downstream of the fluid flow, such that vortex shedding is produced at the upper and lower ends of the bluff body. The T-shape vortex shedder is characterized in that the L/W ratio is approximately 1.56.about.2.0, and the fluid flow produces steady vortex shedding when the Reynolds number of the fluid flow is approximately 2.4.times.10.sup.3 .about.3.2.times.10.sup.4. Furthermore, two hollow pressure passages are established at the upper and lower ends of the bluff body, such that the vortex shedding frequency can be measured by a pressure transducer located outside of the circular pipe. This vortex shedding frequency is linear in relation to the Reynolds number, such that the T-shape vortex shedder of the present invention provides a highly accurate flowmeter.

REFERENCES:
patent: 4448081 (1984-05-01), Kolitsch et al.
patent: 4464939 (1984-08-01), Corpron
patent: 4891990 (1990-01-01), Khalifa et al.
patent: 4984470 (1991-01-01), Hayward et al.
patent: 5170671 (1992-12-01), Miau et al.
Article entitled "A New General Purpose Liquid Flowmeter" by H. V. Mangin, Tappi 58 65 (1975).
Article entitled "Vortex Flowmetering Challenges the Accepted Techniques" by D. J. Lomas, Control & Instrumentation 7, 36 (1975).
Article entitled "Survey of Pipeline Flowmeters" by R. W. W. Scott, et al. J. Phys. E 15, 967 (1982).

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