![]() The lateral pressure which urges the flame of a candle towards the stream of air from a blowpipe is probably exactly similar to that pressure which eases the inflection of a current of air near an obstacle. ![]() It was first documented explicitly in two patents issued in 1936.Īn early description of this phenomenon was provided by Thomas Young in a lecture given to The Royal Society in 1800: ![]() It is named after Romanian inventor Henri Coandă, who was the first to recognize the practical application of the phenomenon in aircraft design around 1910. Merriam-Webster describes it as "the tendency of a jet of fluid emerging from an orifice to follow an adjacent flat or curved surface and to entrain fluid from the surroundings so that a region of lower pressure develops." The Coandă effect ( / ˈ k w ɑː n d ə/ or / ˈ k w æ-/) is the tendency of a fluid jet to stay attached to a convex surface. ![]() The jet as a whole keeps the ball some distance from the jet exhaust, and gravity prevents it from being blown away. The ball "sticks" to the lower side of the air stream, which stops the ball from falling down. A spinning ping pong ball is held in a diagonal stream of air by the Coandă effect.
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