2C20.30 - Coanda Effect - Ball in Air Stream

See paragraph two in the procedure section
Code Number:
2C20.30
Demo Title:
Coanda Effect - Ball in Air Stream
Condition:
Good
Principle:
Bernoulli's Principle
Area of Study:
Heat & Fluids

Disclaimer

Equipment:
Long metal tube with air jet holes, Air hose for long metal tube, Ping Pong Balls, vacuum blower, and 9" beach ball.
Procedure:

The air pressure is the critical factor here and will have to be regulated.  

Turn the vacuum blower onto low pressure and hold the nozzle so that it is upright.  Float the beach ball in the air stream and when the beach ball quits oscillating you should be able to turn the nozzle slowly to a 45 degree angle without the beach ball falling out of the stream.

References:
  • Evan Jones, "How an Air Stream Can Support a Cupcake", TPT, Vol. 53, # 5, May 2015, p. 264.
  • Ignacio Birriel, Jennifer Birriel, "Bubble Gum Bernoulli: A Classic Demo Updated", TPT, Vol. 52, # 5, May 2014, p. 260.
  • Paul Gluck, "A Delicate Balance: Hovering Balloons in an Air Stream", TPT, Vol. 44, # 9, Dec. 2006, p. 574. 
  • Keith Bellof, "Bernoulli M&M's: A Melt-in-Your-Mouth Demonstration", TPT, Vol. 43, # 6, p. 392, Sept. 2005. 
  • Marcelo Magalhaes Fares Saba, "Bernoulli's Ghost", TPT, Vol.  35, # 5, p. 294, May 1997.
  • Bruce D. Bedford, "The Flying Controversy", TPT, Vol. 33, # 6, Sept. 1995, p. 324.
  • Robert P. Bauman, "The Author Replies", TPT, Vol. 33, # 6, Sept. 1995, p. 325.
  • Robert P. Bauman and Rolf Schwaneberg, "Interpretation of Bernoulli's Equation", TPT, Vol. 32, # 8, Oct. 1994, p. 478.
  • Joe Pizzo,  "Deck the Halls: Bernoulli Station", TPT, Vol. 27, # 4, p.  308, April 1989.
  • Robert Goodman, "Bernoulli Ball - It's s Blast", TPT, Vol. 23, # 4, Apr. 1985, p. 219.
  • Glenn F. Powers, "Bernoulli's Principle on a Grand Scale", TPT, Vol. 7, # 2, Feb. 1969, p. 116.
  • Paul K. Newton, Y. Ma, "On Levitation by Blowing", AJP, Vol. 89, #2, Feb. 2021, p. 134.
  • Rod Cross, "Aerodynamics in the Classroom and At the Ball Park", AJP, Vol. 80, # 4, April 2012, p. 289.
  • Kirk T. McDonald, "Levitating Beachballs", AJP, Vol. 68, # 4, p. 388, April 2000.
  • Fj- 9:  Freier and Anderson,  A Demonstration Handbook for Physics.
  • F- 225:  "Ball in Air or Water Jet",  DICK and RAE Physics Demo Notebook.
  • F- 230:  "Float L'eggs and File Handles",  DICK and RAE Physics Demo Notebook.
  • F- 232: "Leaf Blower Levitation", DICK and RAE  Physics Demo Notebook
  • M- 292:  Richard Manliffe Sutton, Demonstration Experiments in Physics.
  • Tik Liem, "The Floating Ball", Investigation to Science Inquiry, p. 57.
  • John Eaden, "Ping-Pong Demo Generates A Spin-Off", Physics Education, Vol. 39, # 4, p. 331.
  • Martin C. Sagendorf, "Bernoulli's Equation & Balanced Forces on a Ping Pong Ball", Physics Demonstration Apparatus, 2009, p. 33.
  • George M. Hopkins, "Gases", Experimental Science, p. 99.
  • Jodi and Roy McCullough, "Bernoulli's Principle with a Blow Pipe", The Role of Toys in Teaching Physics, p. 4.122.
  • David Kutliroff, "74, Air Streams Do Strange Things", 101 Classroom Demonstrations and Experiment For Teaching Physics, p. 162.
  • Martin Gardner, "45, Balls That Change Places", Smart Science Tricks, p. 70.
  • Martin Gardner, "The Floating Ball", Entertaining Science Experiments with Everyday Objects, p. 105.
  • Vicki Cobb and Kathy Darling, "Look, Ma - No Hands", Bet You Can!, p. 74.
  • Borislaw Bilash II, David Maiullo, "Float Your Ball", A Demo a Day: A Year of Physics Demonstrations, p. 198.
  • Jearl Walker, "2.144, Ball in an Airstream", The Flying Circus of Physics Ed. 2, p. 143.
  • Jearl Walker, "2.50, Coanda Effect", The Flying Circus of Physics Ed. 2, p. 101.
  • Julien Clinton Sprott, Physics Demonstrations,  "2.2, Bernoulli Effect",  p.68, ISBN 0-299-21580-6.
  • 4.20:  Jearl Walker, "Beachball in an Air Stream", The Flying Circus of Physics with Answers.
  • "Balancing Ball", Exploratorium Science Snackbook, p. 3.1 - 3.2.
  • Robert Ehrlich,  "Ping-Pong Ball Near a Water Stream",  Turning the World Inside Out, p. 105.
  • Ron Hipschman, "Bernoulli Blower", Exploratorium Cookbook II, 83.1 - 83.2.
  • Neil. A. Downie, "Juggling Airstreams", Ink Sandwiches, Electric Worms and 37 Other experiments for Saturday Science, p. 34.
  • Brian Jones and Matt Fackelman, "Bernoulli Ball", Don't Forget the Duct Tape, p. 9 - 12.
  • Borislaw Bilash II, “Bernoulli Opposes Newton“, A Demo A Day – A Year of Physical Science Demonstrations, p. 218.
"Chapter 6: Aerodynamics: The Bernoulli Ball"

Disclaimer: These demonstrations are provided only for illustrative use by persons affiliated with The University of Iowa and only under the direction of a trained instructor or physicist.  The University of Iowa is not responsible for demonstrations performed by those using their own equipment or who choose to use this reference material for their own purpose.  The demonstrations included here are within the public domain and can be found in materials contained in libraries, bookstores, and through electronic sources.  Performing all or any portion of any of these demonstrations, with or without revisions not depicted here entails inherent risks.  These risks include, without limitation, bodily injury (and possibly death), including risks to health that may be temporary or permanent and that may exacerbate a pre-existing medical condition; and property loss or damage.  Anyone performing any part of these demonstrations, even with revisions, knowingly and voluntarily assumes all risks associated with them.