Demonstrations

Coanda Effect - Ball in Air Stream

Code Number :	2C20.30
Disclaimer:	Reprinted by permission of Dick Berg, University of Maryland, for use on this website. The demonstrations contained and referenced herein are listed for the purposes of cataloging and describing physics demonstrations which should be conducted only under the direction of a trained instructional support professional or physicist. These demonstrations are not presented for the purpose of being conducted by persons unconnected to this Facility and/or persons not consulting with or being supervised by the recognized instructional support professional or physicist and his/her staff. The University is responsible only for those demonstrations carried out using its own equipment using established safety and scheduling policies, and bears no responsibility for those choosing to use this source material for their own purposes. All demonstrations described and contained herein are public domain, and can also be found in reference materials in libraries, bookstores, and electronic sources. Further information regarding legal liability in use of demonstrations and labs will be found on the web site Injuries in School/College Laboratories in USA. The University of Iowa Disclaimers: University of Iowa Disclaimer All Rights Reserved..
Condition :	Good
Principle :	Bernoulli's Principle
Area of Study :	Heat & Fluids
Equipment :	Long metal tube with air jet holes, Air hose for long metal tube, Ping Pong Balls, vacuum blower, and 9" beach ball, Small Single Brass Tube and Ping Pong 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. The ping pong ball in the water stream is a very impressive demonstration. HOWEVER: This can be very messy if extraordinary measures are not employed to confine the water. In our case this would mean the use of the very large water tank.

Web Sites

"Chapter 6: Aerodynamics: The Bernoulli Ball." www.scitoys.com

References

Martin Kamela, "Kamela's Response", TPT, Vol. 46, # 3, March 2008, p. 134.

Peter Eastwell, "Thinking Some More About Bernoulli", TPT, Vol. 46, # 3, March 2008, p. 134.

Martin Kamela, "Thinking About Bernoulli", TPT, Vol. 45, # 6, Sept. 2007, p. 379.

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.

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

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.

Mail Questions and Comments to: Dale Stille