The Slow Mo Guys are back at it again, and this time, they’ve decided to spin an apple until it explodes. To make this happen, Gavin Free used a 150psi air compressor to demonstrate the Coandă effect on an apple, or in other words. This effect occurs when moving fluid that comes in contact with a convex surface follows its curve, rather than continuing on its initial path. In other words, the apple levitated above the jet of air, rapidly spinning and increasing in speed until it exploded. Read more for the video and additional information.
The apple spun so quickly that the high-speed Phantom camera wasn’t even able to capture the action at 1,000 FPS. So, he had to borrow an even better camera from Smarter Every Day’s Destin Sandlin to film the explosion at 28,500 FPS. On a related note, Coandă effect was named after Romanian aerodynamics pioneer Henri Coandă, who was the first to recognize the practical application of the phenomenon in aircraft development.
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As the jet of air bounces off one side of the apple, it creates an area of low pressure between the air and the curved surface. This area of low pressure effectively pulls in the airflow, allowing it to follow the curve of the apple. At this point, as the curved surface of the apple is putting a force on the air, the air exerts an equal and opposite force upward on the apple,” said Free.