US3835703A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flow visualization using color reversible dyes
Assignee: United States Department of the Army
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Filing: 1973-05-21
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Granted: 1974-09-17
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Expires: 1993-05-21
Abstract
Abstract A system for surface flow visualization using color reversible dyes comprising an aerodynamic test model positioned in an air tunnel. The model has means for conducting an activating and erasing fluids to the nose of system. The surface of the model has been covered with a paint which has been impregnated with the color reversible dye. In operation, the tunnel''s airstream entrains droplets of an activating fluid which is conducted from a source to the surface of the model. The droplets of entrained fluid impinges on the model thereby affecting a color change which indicates local direction of surface flow. The flow pattern is dried and photographed. Said flow pattern may be subsequently removed by an erasing fluid and a new one formed.
Inventors
- 👤 C Bush
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:15
CPC Classifications
G; G01; G01M; G01M9/00; G01M9/02; G01M9/04; G01P; G01P13/00; G01P13/0093
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
98 words
A coated aerodynamic model for surface flow visualization comprising a housing having a cone-shaped front section, fluid emission holes extending from the front of the interior of said front section to the exterior surface thereof, fluid conducting means extending axially through the model and connecting with the fluid emission holes, the final coating of the surface of the model comprising a paint having a color indicator encapsulated therein; whereupon the contacting of the surface of the model with an activating solution in a wind tunnel under operation conditions, a color change takes place illustrating the surface air flow.
Claim 2
Dependent Claim
98 words
A coated aerodynamic model for surface flow visualization comprising a housing having a cone-shaped front section, fluid emission holes extending from the front of the interior of said front section to the exterior surface thereof, fluid conducting means extending axially through the model and connecting with the fluid emission holes, the final coating of the surface of the model comprising a paint having a color indicator encapsulated therein; whereupon the contacting of the surface of the model with an activating solution in a wind tunnel under operation conditions, a color change takes place illustrating the surface air flow.
Claim 3
Independent Claim
139 words
A system for surface flow visualization comprising a coaTed aerodynamic model positioned in a wind tunnel, said model comprising a housing having a cone-shaped front section, fluid emission holes extending from the front of the interior of said front section to the exterior surface thereof, fluid conducting means extending axially through the model and connecting with the fluid emission holes, the final coating of the surface of the model comprising a paint having a color indicator encapsulated therein, means for conducting an activating solution to the exterior of the front section, means for conducting an erasing liquid to the exterior of the front section; wherein the operation of the system a flow of activator fluid out of the emission holes produces the desired surface flow patterns which can be subsequently removed by the contacting thereof with an erasing fluid.
Claim 4
Independent Claim
139 words
A system for surface flow visualization comprising a coaTed aerodynamic model positioned in a wind tunnel, said model comprising a housing having a cone-shaped front section, fluid emission holes extending from the front of the interior of said front section to the exterior surface thereof, fluid conducting means extending axially through the model and connecting with the fluid emission holes, the final coating of the surface of the model comprising a paint having a color indicator encapsulated therein, means for conducting an activating solution to the exterior of the front section, means for conducting an erasing liquid to the exterior of the front section; wherein the operation of the system a flow of activator fluid out of the emission holes produces the desired surface flow patterns which can be subsequently removed by the contacting thereof with an erasing fluid.
Claim 5
Dependent Claim
16 words
A system in accordance with claim 1 wherein the activating solution is a sodium hydroxide solution.
Claim 6
Dependent Claim
15 words
A system in accordance with claim 2 wherein the erasing liquid is glacial acetic acid.
Claim 7
Dependent Claim
16 words
A system in accordance with claim 2 wherein the activating solution is a sodium hydroxide solution.
Claim 8
Dependent Claim
25 words
A system in accordance with claim 2 wherein the activating solution is a sodium hydroxide solution, and wherein the erasing liquid is glacial acetic acid.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-09-16 | 1978-03-18 | 1978-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-16 | 1982-03-18 | 1982-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-16 | 1986-03-18 | 1986-09-17 | $7700.00 | Window Closed / Lapsed |