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Code Number: 5H30.50
Demo Title: Magnetohydrodynamic Motor - Ion Motor
Condition: Excellent
Principle: Magnetic Forces in Fluids
Area of Study: Electricity & Magnetism
Equipment:
0 to 150 Volt DC Power Supply, Saturated Copper Sulfate Solution, Dish and Electrodes Apparatus, and Lycopodium Powder.
Procedure:
The MHD motor is designed to run on the overhead projector. Hook the power supply to the electrodes as shown. Remember that there is a magnet that the center electrode fits over. Fill the dish with sat'd copper sulfate sol'n until it is even with the top of the outer electrode. Turn on the power and watch the liquid rotate about the center electrode. Reverse the power supply leads and the liquid will rotate in the opposite direction. Sprinkle some Lycopodium powder on the top of the copper sulfate to make the rotation highly visible.
References:
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- J. P. Rayner, "Experiments in Magnetohydrodynamics", AJP, Vol. 38, #6, June 1970, p. 736.
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- James E. Martin and Kyle J. Solis, "Mesmerizing Magnetic Fields", Physics Today, Vol. 68, #8, Aug. 2015, p. 66.
- Hantao Ji and Steven Balbus, "Angular Momentum Transport in Astrophysics and the Lab", Physics Today, Vol. 66, #8, Aug. 2013, p. 27.
- Richard E. Berg, "A Magnetohydrodynamic Generator", PIRA Newsletter, Vol. 3, #17, Jan. 1990, p. 6.
- G. D. Freier and F. J. Anderson, "Ei-13", A Demonstration Handbook for Physics.
- "MHD II: Make a Magnetohydrodynamic Propulsion Boat", https://www.evilmadscientist.com/2006/mhd-ii-make-a-magnetohydrodynamic-..., Aug. 31, 2010.
- "MHD I: Demonstrate Magnetohydrodynamic Propulsion in a Minute", https://www.evilmadscientist.com/2006/mhd-i-demonstrate-magnetohydrodyna..., Aug. 31, 2010.