Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Quiet Bernoulli Levitation (Aerodynamic Levitation)

  1. Sep 7, 2012 #1
    Bernoulli levitation, or aerodynamic levitation, is a great physics demonstration. You've probably seen it before. The classic demonstration is: take a hair dryer, point it straight up, and put a ping-pong ball in the stream of air. The ping-pong ball floats in mid-air.

    But, most hair dryers are loud. I want to find a way to do this demonstration quietly, so that I can talk to my students more easily while the ball is levitating. Or, maybe set it up as a display on my desk and just leave it running continuously.

    So, does anyone know of a good way to do this quietly? Should I build a soundproof shield around the hair dryer? Is there another device instead of a hair dryer that produces an air stream quietly?
     
  2. jcsd
  3. Sep 9, 2012 #2
    Yes and no. Many labs have access to compressed air at the wall. Because the pressure is generated somewhere else, it is much more quiet, but there is always some noise due to the air stream. Of cause you can always use bottled nitrogen if you have the right size pressure regulator.
     
  4. Sep 9, 2012 #3

    rcgldr

    User Avatar
    Homework Helper

    I'm not sure how this demonstrates Bernoulli principle, but it's interesting. You can also angle the stream to cause the ball to spin and place a tube over ball to cause it to shoot upwards. Example video (all done in one take):

    https://www.youtube.com/watch?v=PdT3ChUl-zk

    Perhaps a small fan similar in size to the ones used to vent a PC case could be used. A regular sized fan and a small beach ball could be used.
     
  5. Sep 9, 2012 #4

    boneh3ad

    User Avatar
    Science Advisor
    Insights Author
    Gold Member

    I would imagine that if you got a computer fan rated for high mass flow that you could probably get the kind of velocity you need if you hooked it up to a contraction.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?



Similar Discussions: Quiet Bernoulli Levitation (Aerodynamic Levitation)
  1. Card Levitation (Replies: 4)

  2. Diamagnetic Levitation (Replies: 3)

  3. Magnetic Levitation (Replies: 16)

Loading...