Vortex flow sensor with a drag body

Details Vortex flow sensor with a drag body Vortex flow sensor with a drag body

1994-12-22

1996-10-29

Chilcot, Richard

Measuring and testing

Volume or rate of flow

By measuring vibrations or acoustic energy

G01F 132

Patent

active

055698590

ABSTRACT:
To create vortex flow sensors with an extended range of constant Strouhal number toward small Reynolds numbers, with a small variation of the vortex separation frequency, and with precise calculability of the Strouhal number in the range of a constant volumetric-flow-rate/vortex-separation-frequency ratio, a drag body is provided which is permanently connected with the internal wall of a fluid-conducting measuring tube of inside diameter D, or fixed in a frame set in the measuring tube, at diametrically opposed points, and which consists of an upstream-side flat trapezoidal part of length l.sub.1, of base width b.sub.1 on the upstream side, and of base width b.sub.2 on the downstream side, and a wake part adjoining the trapezoidal part without a gap and having a cross section in the form of a triangle of length l.sub.2 and base width b.sub.3. The following dimensioning equations hold:

REFERENCES:
patent: 3572117 (1971-03-01), Rodely
patent: 3948097 (1976-04-01), Kurita
patent: 3972232 (1976-08-01), Miller et al.
patent: 4220046 (1980-09-01), Sqourakes
patent: 4285247 (1981-08-01), Klobe
patent: 4441372 (1984-04-01), Barnard
patent: 4485679 (1984-12-01), Pitt et al.
patent: 4592240 (1986-06-01), McHale et al.
patent: 4782710 (1988-11-01), Naguma et al.
patent: 4862750 (1989-09-01), Nice

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