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Remove a cone from the tube

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What type of experiment is this?

Experimental procedure and explanation:

  • Remove the polystyrene foam cone from the tube with the wind from a hair dryer. The tube diameter (inner diameter) is 11.4 cm, and the depth is 30 cm.
  • The cone can be removed by blowing the wind along the wall of the tube. The principle is the same as "Removing a Ball from a Cylinder". There is a large pressure where the air flow turns back, and at the underside of the cone, it is approximately the same pressure. The pressure acting on the underside increased the force that pushed up the cone, causing the cone to rise.
  • In this experiment, air was blown along the wall, but there is also a way to blow air out by aiming at the center of the cone (Remove a ball or egg from the tube).
[Keywords] Momentum theory, pressure
[Related items] Removing a Ball from a Cylinder, Remove a ball or egg from the tube

“Illustrated Fluid Dynamics Trivia,” by Ryozo Ishiwata, Natsume Publishing, P200-201

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Last Update:3.3.2017