Patent US4312236A successfully refreshed from Google Patents.
US4312236A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vortex generating device
Assignee: J Tec Assoc Inc
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Filing: 1979-12-28
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Granted: 1982-01-26
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Expires: 1999-12-28
Abstract
Abstract A narrow generator plate (10) is immersed parallel to the direction of flow of a fluid stream (14) for generating Karman vortices. In its various embodiments the generator plate (10) is provided with surface disruption (52) for generating boundary-layer turbulence in the fluid stream in order to eliminate the occurrence of a boundary-layer transition region which would otherwise occur for a range of fluid flow velocities of interest.
Inventors
- 👤 Richard J. Mahany
- 👤 Archie G. Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:17
CPC Classifications
G; G01; G01F; G01F1/00; G01F1/05; G01F1/20; G01F1/32
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
124 words
A device for generating Karman vortices in a fluid stream, said device comprising: a narrow elongate plate member having an axis of elongation parallel to the direction of flow of said fluid stream, said elongate plate member having side surfaces essentially parallel to said direction flow, said elongate plate member also having at least one aperture, wherein said aperture intersects at least one said side surface to form at said side surface a leading aperture edge with respect to said direction of flow such that said leading aperture edge forms a shedding corner for the generation of vortices; and wherein said side surfaces of said elongate plate member are provided with at least one surface disruption for generating boundary-layer turbulence in the fluid stream.
Claim 2
Independent Claim
124 words
A device for generating Karman vortices in a fluid stream, said device comprising: a narrow elongate plate member having an axis of elongation parallel to the direction of flow of said fluid stream, said elongate plate member having side surfaces essentially parallel to said direction flow, said elongate plate member also having at least one aperture, wherein said aperture intersects at least one said side surface to form at said side surface a leading aperture edge with respect to said direction of flow such that said leading aperture edge forms a shedding corner for the generation of vortices; and wherein said side surfaces of said elongate plate member are provided with at least one surface disruption for generating boundary-layer turbulence in the fluid stream.
Claim 3
Independent Claim
181 words
A device for generating Karman vortices in a fluid stream, said device comprising: a narrow elongate plate member having an axis of elongation parallel to the direction of flow of said fluid stream, said elongate plate member having side surfaces essentially parallel to said direction of flow, wherein said side surface of said plate member have leading portions thereof with respect to said direction of flow, wherein said leading portions of said side surfaces intersect so as to form a leading edge of said plate member, wherein said leading portions of said plate member intersect so as to form an essentially sharp leading edge of said plate, wherein said leading portions of said side surfaces gradually taper inwardly to said leading edge, and wherein said surfaces of said elongate plate member are provided with at least one surface disruption for generating boundary-layer turbulence in the fluid stream; and, a generator member connected to at least one point of said leading edge of said plate member and oriented upstream with respect to said direction of flow for the generation of Kareman vortices.
Claim 4
Independent Claim
181 words
A device for generating Karman vortices in a fluid stream, said device comprising: a narrow elongate plate member having an axis of elongation parallel to the direction of flow of said fluid stream, said elongate plate member having side surfaces essentially parallel to said direction of flow, wherein said side surface of said plate member have leading portions thereof with respect to said direction of flow, wherein said leading portions of said side surfaces intersect so as to form a leading edge of said plate member, wherein said leading portions of said plate member intersect so as to form an essentially sharp leading edge of said plate, wherein said leading portions of said side surfaces gradually taper inwardly to said leading edge, and wherein said surfaces of said elongate plate member are provided with at least one surface disruption for generating boundary-layer turbulence in the fluid stream; and, a generator member connected to at least one point of said leading edge of said plate member and oriented upstream with respect to said direction of flow for the generation of Kareman vortices.
Claim 5
Independent Claim
15 words
The device of claims 1 or 2, wherein said side surface disruption is a hole.
Claim 6
Independent Claim
16 words
The device of claims 1 or 2, wherein said side surface disruption is a radiused slot.
Claim 7
Independent Claim
14 words
The device of claims 1 or 2, wherein said surface disruption is a protuberance.
References Cited (Backward Citations)
GB823684A
Cited
US3759096A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-01-25 | 1985-07-27 | 1986-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-01-25 | 1989-07-27 | 1990-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-01-25 | 1993-07-27 | 1994-01-26 | $7700.00 | Window Closed / Lapsed |