| 1. | Vortex tubes were used by South Africa in their Helikon vortex separation process.
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| 2. | Therefore, the vortex tube is a rotorless turboexpander.
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| 3. | Phenomenological studies of the vortex tube in the past have been useful in presenting empirical data.
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| 4. | Instability is caused when the vortex tube, the line of concentrated vorticity, is displaced.
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| 5. | A vortex tube whose vortex lines are all closed will be a closed torus-like surface.
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| 6. | This equation has been published in 2012; it explains the fundamental operating principle of vortex tubes.
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| 7. | The search for this explanation began in 1933 when the vortex tube was discovered and continued for more than 80 years.
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| 8. | The main physical phenomenon of the vortex tube is the temperature separation between the cold vortex core and the warm vortex periphery.
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| 9. | The method is simple because vortex tubes have no moving parts, but energy intensive, about 50 times greater than gas centrifuges.
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| 10. | In 1931, he filed for a patent on his vortex tube, and in 1933, he presented a paper on it.
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