{
    "title": "Coanda Effect Patents",
    "inventor_name": "Henri Coanda",
    "publication_year": 1936,
    "device_name": "Device for Deflecting a Stream of Elastic Fluid",
    "goal": "To control and deflect high-velocity fluid streams by creating an unbalanced pressure field (Coanda effect) using guiding flaps, enabling propulsion, noise reduction, and fluid handling applications.",
    "problem_addressed": "Difficulty in directing high-speed fluid jets without excessive impact or loss of efficiency; need for simple, passive means to steer fluid streams for propulsion, exhaust management, and fluid processing.",
    "concept_summary": "A high-velocity fluid sheet issued from a nozzle entrains surrounding fluid, creating suction. By placing a guiding flap on one side of the jet, the surrounding fluid flow is restricted, producing an unbalanced pressure that deflects the jet along a desired path. The flap geometry and inclination are chosen based on flow rate and velocity to achieve the required curvature.",
    "detailed_description": null,
    "category": "Aerodynamics & Flight",
    "principles": [
        "Coanda effect",
        "Boundary-layer attachment",
        "Pressure differential induced deflection"
    ],
    "scientific_domains": [
        "Fluid Mechanics",
        "Aerodynamics",
        "Mechanical Engineering"
    ],
    "mechanisms_of_action": [
        "Induced suction from entrained surrounding fluid",
        "Guiding flap creates pressure imbalance",
        "Jet follows the contour of the flap"
    ],
    "materials": [
        "Metal (nozzle, flap)",
        "Steel",
        "Aluminium"
    ],
    "energy_sources": [
        "Compressed gas or fluid pressure"
    ],
    "inputs": [
        "High-velocity fluid stream (gas or liquid)",
        "Surrounding ambient fluid"
    ],
    "outputs": [
        "Deflected fluid jet",
        "Suction zone",
        "Reduced impact on surrounding fluid"
    ],
    "claimed_performance": "The flap can produce strong suction and turn the issuing stream completely around its axis, eliminating forward impact.",
    "experimental_evidence": null,
    "replication_status": null,
    "keywords": [
        "Coanda effect",
        "fluid deflection",
        "jet propulsion",
        "suction",
        "flap guide",
        "hydropropeller",
        "noise silencer",
        "water purification"
    ],
    "related_technologies": [
        "Jet engines",
        "Fluidic thrust vectoring",
        "Coanda thrusters",
        "Cyclone separators",
        "Exhaust silencers"
    ],
    "controversy_level": "low",
    "confidence_score": 0.92,
    "practicability_score": 0.78,
    "fringe_score": 0.15,
    "evidence_strength": 0.22,
    "risk_score": 0.08,
    "trl_estimate": 6,
    "source_urls": [
        "http://www.rexresearch.com/",
        "http://www.rexresearch1.com/",
        "US2052869A.pdf",
        "US2108652A.pdf",
        "US2131472A.pdf",
        "US2157281A.pdf",
        "US2173549A.pdf",
        "US2173550A.pdf",
        "US2187342A.pdf",
        "US2198655A.pdf",
        "US2699644A.pdf",
        "US2770501.pdf",
        "US2796147A.pdf",
        "US2803591A.pdf",
        "US2907557A.pdf",
        "US2920448A.pdf",
        "US2939654A.pdf",
        "US2964306A.pdf",
        "US2988139A.pdf",
        "US2988303A.pdf",
        "US2990103A.pdf",
        "US3047208A.pdf",
        "US3261162A.pdf",
        "US3284318A.pdf",
        "US3321891A.pdf",
        "US3337121A.pdf",
        "US3410758A.pdf",
        "US3685614A.pdf"
    ],
    "organizations": [
        "Henri Coanda"
    ],
    "applications": [
        "Propulsion devices",
        "Jet-vectoring for aircraft",
        "Exhaust noise reduction",
        "Water purification systems",
        "Cyclone separators"
    ],
    "limitations": [
        "Requires sufficiently high jet velocity",
        "Performance depends on precise flap geometry and positioning",
        "Limited to fluids that can be entrained (gases or liquids)"
    ],
    "open_questions": [
        "What is the quantitative efficiency gain versus conventional nozzles?",
        "How does flap wear affect long-term performance?",
        "Can the effect be scaled to large-scale propulsion systems?"
    ],
    "red_flags": [],
    "evidence_quotes": [
        "It is an observed fact that when a stream or sheet of fluid issues through a suitable orifice, into another fluid, it will carry along with it a portion of the surrounding fluid, if its velocity is sufficient.",
        "By a proper knowledge of the physical constants of the surrounding fluid and of the fluid discharged into the same, it is possible to determine the optimum curve to be given to the means for guiding the stream.",
        "The flap may be more or less extended and may be more or less inclined, according to the path which said stream is to be made to follow.",
        "This will eliminate the impact upon the surrounding fluid, which occurs in front of a sheet of fluid discharged at high velocity into another fluid."
    ]
}