- Vortex ring toys
vortex ringis a rolling donut of fluid which is moving through another fluid. A smoke ringis a common example of a vortex ring. Because of the way they rotate, a vortex ring can hold itself together and travel for quite a distance.
Vortex ring toys
The most common vortex toy works by expelling a quantity of air from the toy in such a way as to create a vortex ring. The energy from this vortex is transferred between air particles, in effect moving the vortex downrange, but without forcing the air that was initially displaced through the atmosphere ("citation needed")(this condition would greatly reduce the toy's effectiveness.)
(This disagrees with classical fluid dynamics [Classical Fluid Dynamics] --and common sense. If it were true, the smoke in a ring would be traveling, leaving the air behind, additionally, since a vortex can be generated using a different fluid than the surrounding, and that chemically different fluid will hit the target, it must be assumed that the vortex ring carries at least a major portion of the ejected fluid. According to classical fluid dynamics, the rotation of the air within the vortex--from the inside to the front to the outside to the inside, creates a dynamic flow on the outside of the ring which will greatly reduce the friction of passage through the medium.)
Upon striking an object, the ring proceeds to pummel the target with a short, brief burst of swirling wind as the vortex dissipates. An interesting demonstration of the airflow pattern of a vortex ring toy can be made by having a smoker blow a smoke cloud into the toy prior to it being fired. The smoke will travel in the vortex, making a very large smoke ring. Some toys, such as the Zero Blaster, are built with a smoke generator in the toy, with the purpose being to blow smoke rings.You may use dry ice or steam as appropriate.
Vortex ring generators you can make
* Hit the bottom of an empty plastic milk/juice jug
You can make a vortex ring generator by:
* cutting a round hole in the base of a bucket
* placing film over the top of the bucket (like a drum).
You can then make a vortex ring by holding the bucket and hitting the drum. You can use this vortex ring generator to blow out a candle up to 6 or 7 metres away.
1 [http://maxwell.ucdavis.edu/~cole/phy9b/notes/fluids_ch3.pdf classical fluid dynamics lecture covering vortices]
* [http://www.amasci.com/wing/smring.html good animation of a vortex ring]
* [http://cas.umkc.edu/physics/sps/projects/vortex/vortex.html Giant vortex ring generator ]
* [http://serve.me.nus.edu.sg/limtt/ professor T.T. Lim's site at the University of Singapore. His video gallery includes, among others, rings colliding head on and at an angle and a number still images.]
Wikimedia Foundation. 2010.
Look at other dictionaries:
Vortex ring — A vortex ring, also called a toroidal vortex, is a region of rotating fluid moving through the same or different fluid where the flow pattern takes on a doughnut shape. The movement of the fluid is about the poloidal or circular axis of the… … Wikipedia
Smoke ring — A smoke ring is a visible vortex ring formed by expelling smoke through an opening. It can be created by blowing smoke from the mouth, while smoking. In general, a smoke ring occurs when a mass of fluid (from the mouth, lungs, or another… … Wikipedia
Bubble ring — A bubble ring is an underwater ring vortex where an air bubble occupies the core of the vortex, forming a ring shape. The ring of air as well as the nearby water spins toroidally as it travels through the water, much like a flexible bracelet… … Wikipedia
Air bazooka — An air bazooka or airzooka, which has been described in media for over 16 years, was finally invented by Brian Walker. It is a tube with a flexible plastic cover on one end, named for its resemblance to the bazooka. By pulling back the cover, the … Wikipedia
Helicopter — For other uses, see Helicopter (disambiguation). Helicopter An LAPD Bell 206 … Wikipedia
Mandarin (comics) — The Mandarin The Mandarin. Art by Robert De La Torre. Publication information Publisher Marvel Comics … Wikipedia
List of Teenage Mutant Ninja Turtles (1987) episodes — The following is an episode list for the animated television series Teenage Mutant Ninja Turtles which premiered in 1987. In total 193 episodes aired between 1987 and 1996. The first three seasons were aired in syndication. CBS aired the rest of… … Wikipedia
List of Teenage Mutant Ninja Turtles supporting characters — Table of appearances=A table of characters showing their appearances in the nine major incarnations of the TMNT franchise. Ace Duck Ace Duck is a fictional character from the original franchise.Toy LineHis action figure was released in 1989, part … Wikipedia
Plastic — is the general common term for a wide range of synthetic or semisynthetic organic solid materials suitable for the manufacture of industrial products. Plastics are typically polymers of high molecular weight, and may contain other substances to… … Wikipedia
List of Masters of the Universe characters — The following is a list of the numerous characters within the Masters of the Universe animated series, film, toy lines, and spin offs. Contents 1 Heroic Warriors 1.1 Original characters 1.1.1 He Man/Prince Adam 1 … Wikipedia