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Topic: Coanda effect

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Henri Coanda

	Jef Raskin - Coanda Effect: Understanding Why Wings Work
		Because the surface of the ball is rough, the effect of viscous forces is to create a thin layer of air which rotates with the surface.
		A word often used to describe the Coanda effect is to say that the airstream is "entrained" by the surface.
		The experiments with the miniature wind tunnel described earlier are readily understood in terms of the Coanda effect: the downward-curved wing entrained the airflow to move downward, and a force upward is developed in reaction.
	jef.raskincenter.org /published/coanda_effect.html (4907 words)

	Aeronautics - Henri Coanda
		Coanda was born in Bucharest on June 7, 1886.
		Coanda himself considered that this could be the most important application of his effect for the aviation of the future; in 1967, at a Symposionum organized by the Romanian Academy he said:
		Coanda's 'air-reactive engine' was housed under a cowl and was comprised of a four-cylinder, water-cooled, gasoline-powered engine rotating at 1000 rpm.
	www.allstar.fiu.edu /aero/coanda.htm (1404 words)

	Henri Coanda
		Henri Coanda was one of the pioneers of the Romanian aviation, and could be considered as being the parent of the modern jet aircraft.
		Coanda realized for the first time what would become known as the Coanda Effect while he was testing his jet airplane, Coanda-1910.
		Coanda considered that this could be the most important application of his effect for the aviation of the future.
	www.deltawing.go.ro /history/coanda.htm (0 words)

	Using The Coanda Effect In A Pulsejet
		One such effect is that observed and documented by a Romamanian by the name of Henri-Marie Coanda in the 1930s.
		Coanda noted that a stream of fluid or gas will tend to hug a convex contour when directed at a tangent to that surface.
		This rather unintuitive behavior is the Coanda effect in action.
	www.aardvark.co.nz /pjet/coanda.shtml (871 words)

	Coanda Effect
		The Coanda Effect is the tendency of a stream of fluid to stay attached to a convex surface, rather than follow a straight line in its original direction.
		John Frost of Avro Canada also spent considerable time researching the effect, leading to a series of "inside out" hovercraft-like aircraft where the air exited in a ring around the outside of the aircraft and was directed by being "attached" to a flap-like ring.
		Contrary to popular misconception, it is the Coanda effect that provides the majority of an airfoil[?]'s lift, not Bernoulli's principle.
	www.ebroadcast.com.au /lookup/encyclopedia/co/Coanda_Effect.html (276 words)

	Henri Coanda was one of the pioneers of the Romanian aviation
		Henri Coanda was one of the pioneers of the Romanian aviation
		Coanda considered that this could be the most important application of his effect for the aviation of the future.
		Coanda's "air-reactive engine" was housed under a cowl and was comprised of a 50 hp Clerget four-cylinder in-line, water-cooled, gasoline-powered engine rotating at 1000 rpm.
	romania-on-line.net /halloffame/CoandaHenri.htm (1012 words)

	Coanda effect
		The Coanda effect is important in the understanding of an airfoil's lift.
		This demonstration is the combination of the Venturi effect and the Coanda effect.
		The Venturi effect would cause a drop in pressure between the spoon and the stream of water which would then be drawn towards the spoon.
	www.casimiro.com /wiki/en/wikipedia/c/co/coanda_effect.html (389 words)

	CFD Review \| Navy Successfully Simulates Effect that May Improve Low-Speed Maneuverability
		Coanda jets are created by blowing a moderate to high pressure gas or liquid through a narrow slot over a surface.
		Coanda jets are being investigated for both aerospace and naval applications because they can significantly increase the amount of lift generated by an airfoil.
		NSWC researchers modeled the Coanda jet using three different turbulence models: the standard k-epsilon model, the realizable k-epsilon model (favored for predicting the behavior of round jets), and the Reynolds stress model.
	www.cfdreview.com /application/03/03/27/1716250.shtml (1905 words)

	Coanda Effect in Human Phonation (Site not responding. Last check: )
		Henri Coanda, a Romanian engineer, is credited with discovering that fluid issuing forth from a slot has a tendency to adhere to a surface placed adjacent, and at some acute angle, to the slot.
		In contrast to existing hypotheses, the occurrence of the Coanda effect in unsteady flow was found to be a function of the flow acceleration rather than the frequency of the flow oscillations.
		The presence of the Coanda effect is expected to influence the dipole sound source contribution to speech.
	meweb.ecn.purdue.edu /~tfpl/project_coandaeffct.htm (1786 words)

	Kitchens .com - Gaggeanau
		Coanda was born in Bucharest on June 7, 1886, and is considered one of the pioneers of Romanian aviation and the parent of the modern jet aircraft.
		The effect says that a stream of air or fluid emerging from a nozzel tends to follow a nearby curved surface rather than continue in a straight line.
		On October 8, 1934, Henri Coanda was granted a patent for this effect called "procedure and device for the derivation of a fluid inside another fluid".
	www.kitchens.com /Remodeling-And-Design/Products-and-materials/new-product-news/appliances-Gaggeanau.asp (695 words)

	Coanda effect. The Columbia Encyclopedia, Sixth Edition. 2001-05
		or wall-attachment effect, the tendency of a moving fluid, either liquid or gas, to attach itself to a surface and flow along it.
		Thus, a fluid emerging from a nozzle tends to follow a nearby curved surface—even to the point of bending around corners—if the curvature of the surface or the angle the surface makes with the stream is not too sharp.
		Discovered in 1930 by Henri Coanda, a Romanian aircraft engineer, the phenomenon has many practical applications in fluidics and aerodynamics.
	www.bartleby.com /65/co/Coandaeff.html (185 words)

	Discovery Channel - Flight
		Henri Coanda was one of the pioneers of Romanian aviation and the godfather of the modern jet aircraft.
		The most known, studied and applied discovery of Henri Coanda is the 'Coanda Effect', as demonstrated by his groundbreaking 1910 aircraft.
		In its simplest form, the Coanda Effect recognises how steam emerging from a nozzle tends to follow a nearby curved surface, as long as the curvature of the surface or angle the surface makes is not too sharp.
	www.discoverychannel.com.au /flight/pioneers_of_flight/henri_coanda/index.shtml (316 words)

	Coanda Effect Patents
		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.
		Coanda effect, the tendency of a fluid jet to remain attached to a solid flow...
		Henri Coanda was one of the pioneers of the Romanian aviation
	www.rexresearch.com /coanda/1coanda.htm (1707 words)

	The Coanda Effect by JL Naudin
		The Coanda Effect has been discovered in1930 by the Romanian aerodynamicist Henri-Marie Coanda (1885-1972).
		He has observed that a steam of air (or a other fluid) emerging from a nozzle tends to follow a nearby curved surface, if the curvature of the surface or angle the surface makes with the stream is not too sharp.
		The Coanda Effect works with any of our usual fluids, such as air at usual temperature, pressures and speeds.
	jnaudin.free.fr /html/coanda.htm (309 words)

	The Coanda Flying Saucer, "The Repulsin" type A
		He has observed that a steam of air (or an other fluid) emerging from a nozzle tends to follow a nearby curved surface, if the curvature of the surface (or angle the surface makes with the stream) is not too sharp.
		When the main electric engine is started, the Coanda effect begins to create a differential aerodynamic pressure between the outer and the inner surface of the primary hull.
		The "special outlet adaptator" used for generating the coanda effect is a simple plastic tube (inner diam : 9mm, lenght: 90mm) with a simple plastic disc (50mm diam, with a 9mm hole in the middle) glued to this tube.
	jnaudin.free.fr /html/repcotst.htm (588 words)

	Stalls and Spins [Ch. 18 of See How It Flies]
		The name Coanda effect is properly applied to any situation where a thin, high-speed jet of fluid meets a solid surface and follows the surface around a curve.
		Once again, the Coanda effect cannot explain how the wing works; you have to understand how the wing works before you consider the added complexity of the blower.
		Even when there is a real Coanda effect, as in figure 18.3, it is just a small part of what is happening in the vicinity of the wing.
	www.av8n.com /how/htm/spins.html (7110 words)

	Meridian International Research - Coanda Effect
		The Coanda Effect has come to mean attachment of a flow to a surface beyond where we "expect" it to remain attached - but this is a scientifically meaningless view.
		A small step is inset into the surface of the body which causes the ejected air jet to attach to the surface and flow around it towards the upper surface.
		According to Englar, a pressure differential of 13.8 psi at Sea Level ISA is sufficient to produce a Coanda Jet velocity equal to the speed of sound.
	www.meridian-int-res.com /Aeronautics/Coanda.htm (1584 words)

	Re: coanda effect Joseph Coanda aeronautics
		Greetings: I believe that you are asking about the Coanda effect whish is used extensivly in aeronautics design and which is named after the Romanian scientist Henri Marie Coanda.
		One concept involved using the Coanda effect to turn a sheet of injected secondary air along a curved sidewall flap and, through entrainment, draw the primary jet in the same direction to produce yaw thrust vectoring.
		Utilizing the Coanda effect to produce yaw thrust vectoring was largely unsuccessful.
	www.madsci.org /posts/archives/jan99/915944971.Eg.r.html (0 words)

	Coanda Effect
		Coanda effect is the phenomena in which a jet flow attaches itself to a nearby surface and remains attached even when the surface curves away from the initial jet direction.
		One notable application of the Coanda effect is the NOTAR™ helicopter.
		Coanda effect forms the basis of much of S and C Thermofluids' innovative in-house research programme.
	www.thermofluids.co.uk /effect.php (252 words)

	In 1910
		Following this episode, the unforgiving public dismissed Coanda's creation as a folly. They had not realised that the engine and aerodynamic refinements were years ahead of their time. The prospects for aircraft design could have been forwarded twenty years had Coanda been able to get backing.
		During the machine's short flight, Coanda was able to observe that the burning gasses from the engine seemed to hug the sides of the aircraft very closely and this is what seemed to cause the fire.
		He spent many years researching this effect, which is now known as the Coanda Effect a term coined by Albert Metral after Romanian inventor Henri Coanda.
	www.paperwarbirds.com /html/pages/Coanda.htm (768 words)

	International Water Power and Dam Construction
		The high capacity is a result of the shearing effect produced by the tilted wires, combined with the Coanda effect (fluid following a surface), which pulls water around the bars and through the screen.
		The first constraint with Coanda screens is the head loss between the weir crest and the foot of the screen; typically 500-1300mm.
		The Coanda screens were not used as a replacement for the bar screen due to the threat of damage from excessive bed load during flood conditions.
	www.waterpowermagazine.com /story.asp?sc=2023649 (2734 words)

	Coanda effect (Site not responding. Last check: )
		The Coanda Effect is the tendency of a stream of fluid to stay attachedto a convex surface, rather than follow a straight line in its original direction.
		The principle was named by Albert Metral after Romanian inventor Henri Coanda who became interested in the phenomenon after it destroyed aprototype aircraft he had developed (the Coanda-1910).
		John Frost of Avro Canada also spent considerable time researching theeffect, leading to a series of "inside out" hovercraft -like aircraft where theair exited in a ring around the outside of the aircraft and was directed by being "attached" to a flap-like ring.
	www.therfcc.org /coanda-effect-9377.html (276 words)

	positive displacement, magnetic, turbine, ultrasonic, vortex fluidic, coriolis, thermal, differential pressure, target, ...
		Coanda Effect flowmeters channel the flow stream in the flowmeter so as to utilize the phenomenon that causes a fluid to attach itself to a surface.
		The Doppler effect is a phenomenon related to how sound is perceived from objects in motion, such as the horn of a moving car having a higher pitch moving towards a listener than it does when moving away.
		A flow nozzle is a constriction consisting of a contoured plate that forms a hole for the flow stream that is sandwiched in the pipe between two flanges.
	www.flowmeters.com /ufm/index.cfm?task=glossary (934 words)

	Coanda effect - forums.jetcareers (Site not responding. Last check: )
		I really think the Coanda effect is described in "Flightwise" when the author talks about the development of the trailing edge and aft taper of the airfoil.
		The Coanda effect doesn't require an airfoil shape; one of the most used demonstrations is the way water hugs the back of the spoon.
		The circulator effects of the aft section of the airfoil (made possible by the viscosity of the airflow) is providing a force normal to the direction of rotation.
	www.jetcareers.com /forums/showthread.php?p=470802 (3661 words)

	Transcending the Control System: Coanda Soliton Effect
		The Coanda effect was unknown to me until seven years ago, when in an issue of UFO Universe Magazine, it was mentioned in relevance to Nazi saucer research of the late 30’s and early 40’s.
		In the article, an illustration of the effect was given as follows: one holds a pie plate at a slight angle beneath running water and observes it flowing over the edge, curling around and adhering to the surface beneath for a few millimeters before dropping down into the sink.
		It combined the Coanda effect and soliton phenomena to produce produce propulsion in water radically efficient relative to simple boat and propeller.
	montalk.net /science/71/coanda-soliton-effect (1819 words)

	Re: coanda effect
		An interesting real application of the Coanda effect was its use by the Russian Antonov aircraft bureau in designing the AN-32(turboprop) and AN-72(jet) transports.
		Re: coanda effect - Jonas Larsson, Fri, 4 Sep 1998, 1:49 p.m.
		Re: coanda effect - R Sukumar, Fri, 4 Sep 1998, 2:49 p.m.
	www.cfd-online.com /Forum/main_archive_1998.cgi/read/670 (174 words)

	How Things Work - Airplanes
		The Coanda effect is a common behavior in fluids--viscosity and friction keep them flowing along surfaces as long as they don't have to turn too quickly.
		This action/reaction effect is an example of Newton's third law of motion, which observes that forces always come in equal but oppositely directed pairs: if one object pushes on another, then the second object must push back on the first object with a force of equal strength pointing in the opposite direction.
		A suction effect appears, in which the rear or "trailing" portion of the wing's top surface sucks downward on the air and the air sucks upward on it in response.
	howthingswork.virginia.edu /airplanes.html (7345 words)

	Transcending the Control System: Coanda Soliton Effect (Site not responding. Last check: )
		The Coanda effect was unknown to me until seven years ago, when in an issue of UFO Universe Magazine, it was mentioned in relevance to Nazi saucer research of the late 30’s and early 40’s.
		In the article, an illustration of the effect was given as follows: one holds a pie plate at a slight angle beneath running water and observes it flowing over the edge, curling around and adhering to the surface beneath for a few millimeters before dropping down into the sink.
		It combined the Coanda effect and soliton phenomena to produce produce propulsion in water radically efficient relative to simple boat and propeller.
	www.montalk.net /science/71/coanda-soliton-effect (1819 words)

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