Measuring and testing – Volume or rate of flow – By measuring thrust or drag forces
Patent
1982-10-27
1985-05-21
Goldstein, Herbert
Measuring and testing
Volume or rate of flow
By measuring thrust or drag forces
7386152, 7386161, G01F 140, G01F 128
Patent
active
045178470
ABSTRACT:
A target flowmeter includes a target body with an aperture through its impact surface, to equalize the forces generated on the target under both laminar and turbulent fluid flow conditions, as well as in the transition region therebetween. In a particular embodiment, the target body has an annular shape and is centered about the pipe center line, the size of the aperture being such that the target is acted upon by only those portions of the laminar and turbulent flow profiles having substantially similar shapes. Since the annular body is unaffected by the high velocity peak of the parabolic laminar profile, the force versus velocity relationship in the laminar flow range is approximately the same as in the turbulent flow range. This results in a more consistently accurate flow velocity measurement across the two flow regimes. Specific dimensional relationships between the size of the aperture and that of the pipe serve to optimize these results.
REFERENCES:
patent: 2487083 (1949-11-01), Warshaw
patent: 3759098 (1973-09-01), Logsdon et al.
patent: 4186599 (1980-02-01), Frick
patent: 4290315 (1981-09-01), Groberg
Goldstein Herbert
Martin Terrence
The Foxboro Company
Wu Jack H.
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