Coanda Effect Patents **[rexresearch](http://www.rexresearch.com/) [rexresearch1](http://www.rexresearch1.com/)** --- **Henri COANDA** **Coanda Effect** --- ![](1coanda.gif) **Henri Coanda** --- ***Coanda Effect*** **Noor A Ahmed** --- **[US2052869](US2052869A.pdf) --** **Device for Deflecting a Stream of Elastic Fluid Projected into an Elastic Fluid Henri Coanda** **(Sept. 1, 1936)** 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. In particular, if a sheet of gas at high velocity issues into an atmosphere of another gas of any kind, this will produce, at the point of discharge of the said sheet of gas, a suction effect, thus drawing forward the adjacent gas. If, at the outlet of the fluid stream or sheet, there is set up an unbalancing effect on the flow of the surrounding fluid induced by said stream, the latter will move towards the side on which the flow of the surrounding fluid has been made more difficult. It is thus evident that it will be possible, by a suitable checking of the surrounding fluid in one side of the orifice from which the fluid stream or sheet is discharged at high velocity, to act indirectly upon the direction of the issuing stream or sheet. In consequence, by the successive checking of the several layers of the fluid sheets on the proper side, if it is considered that the latter may be theoretically divided into layers to facilitate the demonstration, they may be made to follow any desired path. Such is the object attained by the present invention, whose essential characteristic consists in the production of a determined unbalancing effect in the flow of the surrounding fluid induced by a sheet or stream of fluid which is discharged thereinto at high velocity. For this purpose, the discharge orifices for the fluid each include, on the side toward which said sheet or stream is to be deflected, guiding means, for instance a flap which is suitably inclined according to the rate of flow and the velocity of the fluid, and said 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. On the other hand, 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, according to its rate of flow and velocity. The invention further relates to the application of the said process for the deflection of fluid streams which penetrate with a high velocity into another fluid. In particular, it relates to its application to the change of direction of the direct reactions due to the abrupt discharges of one fluid into another, which reactions are even greatly increases by the fact that on the side which is not checked, the effect of suction is very greatly increased. The accompanying diagrammatic drawing shows the direction of the streams of fluid which are discharged at high speed into another fluid through a nozzle, in the case of an equilibrium or lack of equilibrium of the facilities of withdrawal of the surrounding fluid at the sides of the stream. Figure 1 shows the free discharge of a fluid stream 1, issuing from a nozzle, for instance, whose cross section has the form of a slot 2, also showing the induced flow of the surrounding fluid according to the arrows 3. ![](2052a.gif) Figure 3 shows the checking of the surrounding fluid on one side of the stream by means of a flap 4 which prevents the flow of the surrounding air from space 5, and also the deflection, according to the arrows 3,of the issuing stream discharged from said nozzle. ![](2052b.gif) Figure 3 represents the flap 4 which is extended according to a given outline, thus producing a strong suction, at 6, of a stream which is entirely turned about, according to the arrows 7. 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. ![](2052c.gif) --- **[US2108652](US2108652A.pdf) -- Propelling Device** ![](2108652.gif) --- **[US2131472](US2131472A.pdf) -- Motor** ![](2131472.gif) --- **[US2157281](US2157281A.pdf) -- Propelling Device** ![](2157281.gif) --- **[US2173549](US2173549A.pdf) -- Silencer for Engines** ![](2173549.gif) --- **[US2173550](US2173550A.pdf) -- Exhaust of Gases from Engines** ![](2173550.gif) --- **[US2187342](US2187342A.pdf) -- Exhaust of Gases from Engines** ![](2187342.gif) --- **[US2198655](US2198655A.pdf) -- Device for Facilitating the Discharge of a Gas Under Pressure** ![](2198655.gif) --- **[US2699644](US2699644A.pdf) -- Hydropropeller** ![](2699644.gif) --- **US2770501 -- Means for the Atomization of Liquids** ![](2770501.gif) --- **[US2796147](US2796147A.pdf) -- Cyclone Separator** ![](2796147.gif) --- **[US2803591](US2803591A.pdf) -- Apparatus for Purification of Undrinkable Water** ![](2803591.gif) --- **[US2907557](US2907557A.pdf) -- Apparatus for Imparting Rapid Speed to a Mass of Fluid** ![](2907557.gif) --- **[US2920448](US2920448A.pdf) -- Apparatus for Imparting Rapid Speed to a Mass of Fluid** ![](2907557.gif) --- **[US2939654](US2939654A.pdf) -- Device for Simultaneous Control of Lifting & Directional Elements** ![](2939654.gif) --- **[US2964306](US2964306A.pdf) -- Thermo-Blower** ![](2964306.gif) --- **[US2988139](US2988139A.pdf) -- Spraying Device** ![](2988139.gif) --- **[US2988303](US2988303A.pdf) -- Jet-Sustained Aircraft** ![](2988303.gif) --- **[US2990103](US2990103A.pdf) -- Jet Exhauster** ![](2990103.gif) --- **[US3047208](US3047208A.pdf) -- Device for Imparting Movement to Gases** ![](3047208.gif) --- **[US3261162](US3261162A.pdf) -- Lifting Apparatus** ![](3261162.gif) --- **[US3284318](US3284318A.pdf) -- Apparatus for Recovering Heat Released by Condensation of a Vaporized Liquid** ![](3284318.gif) --- **[US3321891](US3321891A.pdf) -- Apparatus for Transporting Atomizable Material** ![](3321891.gif) --- **[US3337121](US3337121A.pdf) -- Fluid Propulsion System** ![](3337121.gif) --- **[US3410758](US3410758A.pdf) -- Water-Purifying Apparatus** ![](3410758.gif) --- **[US3685614](US3685614A.pdf) -- Method & Apparatus for Attenuating Noise...** ![](3658614.gif) --- ***Scientific American* (1980** **"Applications of the Coanda Effect"** **Imants Rebs** ![](1acoanda.jpg)![](2acoanda.jpg) ![](3acoanda.jpg) ![](4acoanda.jpg) ![](5acoanda.jpg) ![](6acoanda.jpg) ![](7acoanda.jpg) --- --- **Patents** **[AU2020281012](AU2020281012B1.pdf) -- Apparatuses Based on Jet-Effect and Thermoelectric Effect****[CA3082768](CA3082768A1.pdf) -- WATER INTAKE STRUCTURE****[CN111520762](CN111520762A.pdf) -- Novel combustion chamber based on principle of vortex control diffuser** **[CN115635504](CN115635504A.pdf) -- NEGATIVE PRESSURE GENERATING DEVICE AND SUCTION GRIPPER** **[CN218133802](CN218133802U.pdf) -- Air knife and air blowing device** **[CN115465445](CN115465445A.pdf) -- Control-surface-free airfoil lift device based on feedback-free oscillation jet flow****[CN111810427](CN111810427A.pdf) -- Super-long-range fan structure based on Coanda effect****[CN210906938](CN210906938U.pdf) -- Ultrasonic jet pipe** **[CN111204455](CN111204455A.pdf) -- Disc wing aircraft** **[CN110871878](CN110871878A.pdf) -- Novel water-spraying propelling device** **[CN209840755](CN209840755U.pdf) -- Fluid air cooler capable of being fully cooled based on Coanda effect principle** **[CN120350518](CN120350518A.pdf) -- Spray head and washing equipment** **[CN120332799](CN120332799A.pdf) -- Annular fluid oscillator nozzle combustion chamber** **[CN120304632](CN120304632A.pdf) -- Air blower capable of increasing air flow based on negative pressure flow increasing structure** **[CN120274472](CN120274472A.pdf) -- Ice making device and ice maker** **[CN120140272](CN120140272A.pdf) -- Industrial fan** **[CN222889959](CN222889959U.pdf) -- Liquid film type cyclone separator based on coanda effect inlet** **[CN119885311](CN119885311A.pdf) -- Design optimization method for deep sea mineral resource ore collection head based on coanda effect** **[CN222688116](CN222688116U.pdf) -- Heat dissipation device based on air multiplication and stage lamp with same** **[CN222688285](CN222688285U.pdf) -- Energy gathering ring and stove** **[CN222228796](CN222228796U.pdf) -- Double-cavity series piezoelectric pump based on coanda effect jet element** **[CN119058597](CN119058597A.pdf) -- Defrosting method and device and vehicle** **[CN222067178](CN222067178U.pdf) -- Fan for changing air outlet direction by using coanda effect and air purification equipment** **[CN118992094](CN118992094A.pdf) -- Efficient power lift augmentation type ground effect aircraft** **[CN118236879](CN118236879A.pdf) -- Optimized fluid guiding device based on Archimedes spiral and Coanda effect** **[CN118238964](CN118238964A.pdf) -- Grabbing and sucking integrated underwater mechanical gripper based on coanda effect** **[CN221169770](CN221169770U.pdf) -- Thrust vectoring nozzle based on coanda effect** **[CN118004415](CN118004415A.pdf) -- Rotor aircraft** **[CN220769455](CN220769455U.pdf) -- Seabed mining device** **[CN117682117](CN117682117A.pdf) -- Tilting transformation vertical take-off and landing aircraft based on coanda effect** **[CN117682116](CN117682116A.pdf) -- Full-flexible body unmanned aerial vehicle based on coanda effect** **[CN220505449](CN220505449U.pdf) --Novel undisturbed dredging jet pump** **[CN117262180](CN117262180A.pdf) -- Underwater propelling and steering integrated propeller** **[CN212962030](CN212962030U.pdf) -- Self-enhancement exhaust device** **[CN112572773](CN112572773A.pdf) -- Wing high-lift device and wing high-lift method** **[CN212732863](CN212732863U.pdf) -- Novel air knife suitable for rapid solidification of liquid film** **[CN112282857](CN112282857A.pdf) -- Air film cooling hole pattern structure** **[CN112343600](CN112343600A.pdf) -- Novel seabed ore collecting equipment based on Coanda effect and ore collecting method thereof** **[CN112324517](CN112324517A.pdf) -- Design method of air film cooling hole with Coanda bulge** **[CN116816310](CN116816310A.pdf) -- Underground flow channel type flow selection controller based on Tesla valve** **[CN116639239](CN116639239A.pdf) -- Fluid propeller based on coanda effect** **[CN219291090](CN219291090U.pdf) -- Optimized fluid guiding device based on Archimedes spiral and Coanda effect** **[CN115788953](CN115788953A.pdf) -- Coanda jet blade, impeller and axial flow compressor****[CN116006351](CN116006351A.pdf) -- Bladeless hollow aero-engine and rocket** **[CN112937851](CN112937851A.pdf) -- Vertical take-off and landing fixed-wing aircraft using coanda effect for lift augmentation** **[CN216994813](CN216994813U.pdf) -- Jet propeller** **[CN114524072](CN114524072A.pdf) -- Full-revolving propeller based on Coanda effect** **[CN113894024](CN113894024A.pdf) -- Novel air knife suitable for rapid solidification of liquid film** **[CN113859517](CN113859517A.pdf) -- Blowing and high-lift device for upper surface of wing of ducted fan of electric aircraft** **[ES1311576](ES1311576U.pdf) -- POWER GENERATING DEVICE** **[GB2597442](GB2597442A.pdf) -- Vortex generators for jet fans** **[JP2025038374](JP2025038374A.pdf) -- COANDA...** **[JP2023087318](JP2023087318A.pdf) -- VEHICULAR AIR CONDITIONER** **A BLADE TYPE WINDMILL** **[JP2022178344](JP2022178344A.pdf) -- WIND POWER GENERATION BOAT** **[JP2022117796](JP2022117796A.pdf) -- PROPULSION UNIT AND HYDROFOIL CRAFT WITH THE SAME** **[KR102627406](KR102627406B1.pdf) -- Wind power generator with venturi tube and coanda nozzle for ship** **[KR20240083377](KR20240083377A.pdf) -- Combustors using the Coanda Effect** **[KR20240094345](KR20240094345A.pdf) -- Fluid Supply Apparatus** **[KR20230057164](KR20230057164A.pdf) -- A VORTEX RING THRUSTER USING THE COANDA EFFECT****[KR20230094685](KR20230094685A.pdf) -- PRE-SWIRL STATOR HAVING COANDA EFFECT** **[KR20230015766](KR20230015766A.pdf) -- AIR MOBILITY** **[KR20220149046](KR20220149046A.pdf) -- WIND-FREE AIR VENT FOR VEHICLES** **[KR20220103396](KR20220103396A.pdf) -- Ship propulsion system equipped with flow control module** **[KR20220067052](KR20220067052A.pdf) -- Propellar system for vessel** **[KR20220067666](KR20220067666A.pdf) -- Ship propulsion system** **[KR20210060276](KR20210060276A.pdf) -- AIR VENTILATION APPARATUS FOR VEHICLE USING COANDA EFFECT** **[RO137290](RO137290A0.pdf) -- AERIAL VEHICLE WHICH MOVES BY USING THE AIR JET FLOWING ALONG AN AERODYNAMIC PROFILE** **[RO137102](RO137102A2.pdf) -- AIR VEHICLE USING GAS DYNAMIC EFFECT OF AIR JET FLOWING ALONG A PROFILED WALL FOR INCREASING LIFTING FORCE** **[RO138303](RO138303A2.pdf) -- HYBRID REACTIVE PROPELLER WITH COANDĂ EFFECT AND FLYING-TAXI AIRCRAFT USING IT** **[RO133846](RO133846A2.pdf) -- PROPULSION UNIT AND VERTICAL TAKE-OFF AND LANDING AIRCRAFTS** **[RU2731801](RU2731801C1.pdf) -- DISCHARGE DEVICE WITH STABILIZING DEVICE CREATING A COANDA EFFECT** **[WO2024112314](WO2024112314A1.pdf) -- METHOD FOR DEFLECTING A FLOW USING THE REVERSE COANDA EFFECT** **[WO2024060633](WO2024060633A1.pdf) -- AIRCRAFT WING HAVING INTEGRATED DISTRIBUTED DUCTED FAN, AND ELECTRIC AIRCRAFT** **[WO2021208959](WO2021208959A1.pdf) -- AIR AMPLIFIER VENTILATION (AAV) SYSTEM** **[WO2020107093](WO2020107093A1.pdf) -- AERODYNE WITH A PROPULSIVE SAUCER FOR COANDA EFFECT PROPULSION** **[WO2025068808](WO2025068808A1.pdf) -- AN APPARATUS FOR CREATING FORCED VORTEX** ****[US4446695](US4446695A.pdf) -- Aircraft Propulsion Assembly**** ****[US4478378](US4478378A.pdf) -- Aircraft with Jet Propulsion********[US4537371](US4537371A.pdf) -- Coanda Effect Bullet********[US4568042](US4568042A.pdf) -- Internal Wing Aircraft********[US4579300](US4579300A.pdf) -- Internal Wing Aircraft********[US4442986](US4442986A.pdf) -- Leading Edge Augmentor...**** ****[US5067509](US5067509A.pdf) -- Gas Jet Actuator Using Coanda Effect********[US5085039](US5085039A.pdf) -- Coanda Phenomena Combustor********[US5097660](US5097660A.pdf) -- Coanda Effect Turbine Nozzle Vane Cooling********[US5293946](US5293946A.pdf) -- Divergent Fluid Nozzle for Drilling Tool********[US5545063](US5545063A.pdf) -- Chambered Anti-Coanda Jet Marine Propulsion Device...********[US5601047](US5601047A-1.pdf) -- Dual-Cavitating Hydrofoil Structures********[US5658141](US5658141A.pdf) -- Device for Spreading A Flame by the Coanda Effect******[US4069977](US4069977A.pdf) -- Jet engine tail pipe flow deflector** **[US4078498](US4078498A.pdf) -- Single power unit air propelled system** **[US4146197](US4146197A.pdf) -- Boundary layer scoop for the enhancement of Coanda effect...** **[US4266142](US4266142A.pdf) -- Fluid system and method****[US4261516](US4261516A.pdf) -- Air Nozzle****[US4341643](US4341643A.pdf) -- Settling tanks for waste disposal** **[US4348168](US4348168A.pdf) -- Process and apparatus for atomizing and burning liquid fuels** **[US4392621](US4392621A.pdf) -- Directional control of engine exhaust thrust vector in a STOL-type aircraft** **[US4405296](US4405296A.pdf) -- Metallic particle generation device** **[US5601047](US5601047A-1.pdf) -- Dual-Cavitating Hydrofoil Structures** **[US5658141](US5658141A.pdf) -- Device for Spreading A Flame by the Coanda Effect** ******PDF ]****[US5732478](US5732478A.pdf) -- Forced air vacuum drying** **[US5749161](US5749161A.pdf) -- Motor vehicle dryer with Coanda effect drying** **[US5884360](US5884360A.pdf) -- Nozzle arrangement and use thereof** **[US5732478](US5732478A.pdf) -- Forced Air Vacuum Drying****[US5749161](US5749161A.pdf) -- Motor Vehicle Dryer with Coanda Effect** **[US5884360](US5884360A.pdf) -- Nozzle Arrangement** **[US5974802](US5974802A.pdf) -- Exhaust Gas Recirculation System...** **[US6000635](US6000635A.pdf) -- Exhaust Nozzle for a Turbojet Engine** **[US6039269](US6039269A.pdf) -- Coanda Effect Nozzle** **[US6234169](US6234169B1.pdf) -- Inhaler** **[US6240911](US6240911B1.pdf) -- Air Amplifier** ****[US11786908](US11786908B1.pdf) -- Autogenous impact mill that reduces size of friable material**** **[US2025215903](US2025215903A1.pdf) -- ELECTROHYDRODYNAMIC GAS FLOWRATE AMPLIFIER FOR GENERATING A GAS FLOW** **[US2023330714](US2023330714A1.pdf) -- COANDA EFFECT INDUCED LAMELLAE CLEANING SYSTEM FOR WASTEWATER...** **[US2021268532](US2021268532A1.pdf) -- NOZZLE DEVICE** **[US2022173299](US2022173299A1.pdf) -- Apparatuses Based on Jet-Effect and Thermoelectric Effect** **[US2022081111](US2022081111A1.pdf) -- Vertical Take-Off and Landing Unmanned Aerial Vehicle...****[US2022074384](US2022074384A1.pdf) -- FLUID FLOW ENERGY EXTRACTION SYSTEM AND METHOD RELATED THERETO** **[US2023093100](US2023093100A1.pdf) -- FLUID SUPPLY APPARATUS FOR INDUCING CAVITATION AND COANDA EFFECTS** **[US2023033764](US2023033764A1.pdf) -- AEROSOL GENERATING DEVICE** **[US2022386441](US2022386441A1.pdf) -- DEVICE FOR CONTAINING AND ACCELERATING PLASMA ... THE COANDA EFFECT****[US2025020321](US2025020321A1.pdf) -- GAS-AIR MIXING STRUCTURE AND BURNER** --- ---