
	Where results make sense

Topic: Vortex ring

Related Topics

Vortex shedding

Vortex

	Electron Ring Vortex Model
		The purpose of this paper is to propose an ether-vortex model of the electron as a rotating toroidal ring vortex and a positron as a counter-rotating toroidal ring vortex that is based on a synthesis of various other proposed models of particle physics that may eventually be integrated into a unified theory.
		Of course this kinetic elasticity of form is perfect elasticity for vortex rings in a perfect liquid.
		Penrose's twistor is a vortex ring, as is a magnetic field.
	www.astrosciences.info /Ring.html (1445 words)

	Lord Kelvin \| On Vortex Atoms
		A very remarkable discovery made by Helmholtz regarding the simple vortex ring is that it always moves, relatively to the distant parts of the fluid, in a direction perpendicular to its plane, towards the side towards which the rotatory motion carries the inner parts of the ring.
		The determination of the velocity of this motion, even approximately, for rings of which the sectional radius is small in comparison with the radius of the circular axis, has presented mathematical difficulties which have not yet been over-come [2].
		Let now the ring be moved perpendicular to its own plane in the direction with the motion of the fluid through the middle of the ring, with a velocity very small in comparison with that of the fluid at the centre of the ring.
	zapatopi.net /kelvin/papers/on_vortex_atoms.html (2935 words)

	Russell J. Donnelly
		Vortex phenomena span an incredible range of scales: quantized vortices in helium II have a core size of an Angstrom, tornados and waterspouts of ordinary human scale, phenomena such as Jupiter’s red spot have planetary scales and vortex motions are evident in entire galaxies.
		The lifetime of the rings is determined by friction on the core, and by the growth of core instabilities.
		Knowledge of vortex ring dynamics can help other problems: For example, vortex loops or horseshoe vortices pinned to boundaries by roughness can play a role in nucleation of other vortices and are important in their own right.
	darkwing.uoregon.edu /~rjd/vortex_rings.htm (328 words)

	Dynamics of Vortex Rings
		In the laboratory vortex rings are created by pushing a finite amount of dyed fluid through a sharp-edged circular orifice cut in a thin plate.
		The vortex generator is placed on the bottom of a large rectangular tank, oriented such that all vortex rings move upward.
		This secondary vortex is then advected by the local flow field of the primary vortex, and it increases in strength due to stretching around the core of the primary (second image).
	www.fluid.tue.nl /WDY/vort/vortrings/vortrings.html (774 words)

	eFluids (Site not responding. Last check: 2007-10-11)
		A vortex ring generation geometry that has been cited as a standard consists of the tube exit mounted flush with a wall with the piston stroke ending at the tube exit.
		We employ this geometry to investigate the effect of the vortex that forms in front of the advancing piston (piston vortex) on the primary vortex ring that is formed at the tube exit.
		The ingestion of the piston vortex results in an increased ring impulse and an altered trajectory, when compared to the case when the piston motion is finished inside the tube.
	www.efluids.com /efluids/gallery_jim/vortex_pages/ring_vortex_page.htm (171 words)

	Vortex rings (Site not responding. Last check: 2007-10-11)
		The ingestion of the piston vortex results in an increased ring impulse and an altered trajectory, when compared to the case when the piston motion is finished piston speed and piston diameter, is the order of three thousand, transition to turbulence is observed during the self-induced translation phase of the ring motion.
		The structure of the instability appears to be similar to the streamwise vortex filaments that form in the braid regions of shear layers This instability was subsequently ingested into the primary ring during the translation phase and may act to accelerate the growth of the Tsai-Widnall instability.
		Reference:Interaction of a vortex ring with a piston vortex J.
	www.princeton.edu /~gasdyn/Vortex/vortex.html (481 words)

	Vortex Ring Gun
		The method of operation of this weapon is by discharging a blank cartridge into a diverging nozzle, the pressure accelerates a gas cylinder at high mach number and atmospheric pressure into a stationary gas.
		An incapacitating agent is injected into the supersonic jet stream and spin within the vortex mixes and activates the agent in flight.
		Candidate platform for the Vortex Ring Gun is GL-6 repeating revolver 40-mm grenade launcher.
	www.defense-update.com /products/v/vortex-ring.htm (214 words)

	Simple method for the controlled production of vortex ring bubbles of a gas in a liquid - Patent 6824125
		As the ring advances upwards under the influence of buoyancy force, it pinches off from the gas in the nozzle that remains captive at the nozzle exit under the influence of capillary, or surface tension forces.
		For the vortex ring bubble, there is also an upward buoyancy force present but that is balanced by a downward cross-flow force arising from the lateral spread of the spinning core of the ring, analogous to the lateral force on a spinning ball.
		As before, the pressure at which the vortex forms is a consequence of the resilience of the valves, and the duration of the pulse is also determined by this pressure and the volume of the tubing feeding the valve.
	www.freepatentsonline.com /6824125.html (7648 words)

	Session DE - Vortex Rings.
		A Lagrangian vortex method is used to simulate the three-dimensional motion of unstable vortex rings in free space, and the collision between two couter-rotating vortex rings.
		The sensitivity of a vortex ring to initial perturbations of varying azimuthal wave numbers is well documented; however, in the present set of experiments, the effect of boundary conditions on the self induced convection velocity field and subsequent formation and azimuthal distribution of longitudinal vortex filaments is explored.
		Vortex ring convection was studied in three sets of closed side walls forming a triangular, square and round section with a constant hydraulic diameter.
	flux.aps.org /meetings/BAPSDFD96/abs/S460.html (1327 words)

	BubbleRings.com :: FAQ
		A vortex ring is the phenomenon where a quantity of fluid or gas in a toroid (donut) shape, travels through a medium of fluid or gas, while spinning like a thick circular bracelet that is being rolled off of a person's arm.
		Vortex rings have been shown to appear in some people's heart chamber, (rings made of blood travelling through the blood in the chamber), as a form of pathology.
		Dolphins sometimes create bubble rings that travel sideways through the water, instead of up towards the surface, and these bubble rings are sometimes more like arches, with most of the air appearing at the top part of the ring, and the bottom part of the ring partially or completely missing.
	www.bubblerings.com /bubblerings/faq.cfm (2332 words)

	Helicopter Aviation
		During the vortex ring state, roughness and loss of control is experienced because of the turbulent rotational flow on the blades and the unsteady shifting of the flow along the blade span.
		For steeper approaches, vortex ring state can be avoided by using a speed either faster or slower than the area of severe turbulence and thrust variation.
		At steep angles, the vortex ring wake is below the helicopter at slow rates of descent and above the helicopter at high rates of descent.
	www.copters.com /aero/settling.html (683 words)

	Vortex ring (Nick Lappos)
		Vortex ring is the fancy term for the rotor eating its own downwash.
		The Theory would say that the power required at the Vortex Ring state is nearly infinate, but in practice, if you have enough power, you can increase pitch and reestablish normal flow.
		In a nutshell, I think it unlikely that vortex ring state is to blame, but that power limitations or stall or both (as rotors are drooped at power limits, stall can quickly develop) can possibly explain the problem.
	yarchive.net /air/vortex_ring.html (1262 words)

	Krafft2.html
		Physicists usually try to summarily dismiss the new vortex atom theory with the comment that it is merely a revival of the 19th century theory of Lord Kelvin which proved to be a failure.
		Since the new vortex theory deals primarily with the vortex structures of the subatomic particles (protons, electrons and neutrons) it obviously cannot be the same as Kelvin's theory because these subatomic particles were not known during the time of Kelvin.
		This would probably be true of the Kelvin vortex rings, but could not be true of vortex rings of the new 20th century ether or in any fluid which has even a slight degree of viscidity.
	www.navi.net /~rsc/krafft02.htm (1086 words)

	Pulsed Jet Micropropulsion
		Vortex ring formation at low Reynolds number: Each pulse of a pulsed jet engenders the formation of a vortex ring (or “smoke ring”), so studying vortex rings provides useful information about pulsed jets.
		The vortex ring formation process is being studied using a piston-cylinder mechanism (see picture on the left below).
		A vortex ring is generated by translating a piston of diameter D through a length L in the cylinder, thereby ejecting a slug of fluid.
	engr.smu.edu /~pkrueger/micropropulsion.htm (710 words)

	vortex ring formation (Site not responding. Last check: 2007-10-11)
		The piston stops moving at t=1.6 and thereafter a counter-rotating ring forms at the tube opening.
		In the simulation results shown below, the shear layer is represented by a free vortex sheet and the circular tube by a bound vortex sheet.
		Nitsche, M. & Krasny, R. A numerical study of vortex ring formation at the edge of a circular tube, J.
	www.math.lsa.umich.edu /~krasny/vortex_ring.html (163 words)

	Research: Velocity of an axisymmetric vortex ring (Site not responding. Last check: 2007-10-11)
		A stable laminar vortex ring is formed when an axisymmetric impulse is imparted on a fluid.
		The laminar vortex ring is one of the most fundamental of the canonical flow fields used in the study of vorticity dynamics, and the simple structure of the ring lends itself sell to both experimental and theoretical investigation.
		In the same sense the ring provides a simple flow field, simultaneously accesible to experimental, numerical and theoretical study, in which understanding of the molecular mixing process in fluid flows can be meaningfully examined and extended.
	cens.ioc.ee /~berez/my/ring.html (135 words)

	Vortex ring - Wikipedia, the free encyclopedia
		A vortex ring, also called a toroidal vortex or Hill's vortex, is a region of rotating fluid moving through the same or different fluid where the flow pattern takes on a doughnut shape.
		One way a vortex ring may be formed is by pushing a spherical mass of fast moving fluid (A) into a mass of stationary fluid (B).
		A vortex ring state (VRS), though, involves a toroid-shaped path of airflow circumscribing the blade disc, as the airflow moves down through the disc, then outward, and then down through the top again.
	en.wikipedia.org /wiki/Vortex_ring (661 words)

	LEAP - Home (Site not responding. Last check: 2007-10-11)
		Any box with a hole in the side of it can be made to produce the smoke rings that you see, formally known as vortex rings.
		Vortex rings are a fluid phenomenon that result from the presence of viscosity in air, the conservation of momentum, and the continuity equation.
		In this competition, the kids designed and built vortex ring guns to test different ideas about what shapes and sizes etc. make a vortex ring go farther, and to see what different shapes could be made.
	www.seas.wustl.edu /gk12/vortex.htm (104 words)

	Vortex Ring / Wall Interactions
		Smoke rings are probably the most commonly seen form of vortex ring, although if you allow a drop of cream to fall into a glass of water while watching it from the side or top, you'll see a vortex ring form there, too.
		In our experiments when a stable vortex ring interacts with a wall that is 3 diameters or less away from the tip of the vortex ring tube, the secondary and tertiary vortex rings rebound so strongly that they actually travel up and out, toward the top of our tank (e).
		he ideal velocity field associated with a vortex ring is quite simple along the center line of the experiment: The radial velocity component, labelled ``v'' in the adjacent plot, should remain zero all of the time, while the downward velocity component, labelled ``u'' in the figure, should smoothly rise to a maximum and then fall.
	www.egr.msu.edu /tmual/CHuck/ring.html (930 words)

	The Magnus Effect on a Vortex (Site not responding. Last check: 2007-10-11)
		The Magnus effect on a vortex can be demonstrated by injecting a vortex ring into a cross-flow.
		As shown in the schematic below, as the vortex ring propagates into the cross-flow, there is a Magnus force directed upwards on the leading edge of the ring and a force directed downwards on the downstream section.
		The Magnus effect produces an upwards force on the upstream section of the ring and a downwards force on the downstream section.
	www.rap.ucar.edu /staff/crook/magnus.html (254 words)

	Airfoils, Bernoulli and Newton (Site not responding. Last check: 2007-10-11)
		The lift on a spinning cylinder has been clearly demonstrated, and its discussion includes a vortex in the circulating air.
		Many discussions of airfoil lift invoke such a vortex in the effective circulation of air around the moving airfoil.
		Conservation of angular momentum in the fluid requires an opposite circulation in the air shed from the trailing edge of the wing, and such vortex motion has been observed.
	hyperphysics.phy-astr.gsu.edu /hbase/fluids/airfoil.html (925 words)

	Ring Vortex Method for Delivering Gasses
		The fluid dynamics of ring vortices are largely unaffected by crosswinds or the downwash of a helicopter.
		The ring vortex method of gas delivery is based on the aerodynamic process of delivering compressed gasses in combination with a propellant in rapid fire succession.
		The induction flow and momentum associated with the ring vortex enables much of the original gas to be retained while navigating around corners and down passages inaccessible by a direct flow.
	www.zyn.com /flcfw/fwtproj/Ringvort.html (550 words)

	Data Acquisition and the Space Shuttle
		Data collected from VORTEX should lead to better methods for fluid atomization (important in the design and operation of internal combustion engines), inert gas atomization (vital in powder metallurgy) and encapsulating drops of complex structures (key to pharmaceutical developments).
		VORTEX should provide new data on the formation of such satellite drops and the significance of density change across the interface in the process.
		The vortex ring generator, which is located at the bottom of the test cell, consists of a piston moving inside a cylindrical cavity.
	www.iotech.com /iipnasa.html (1021 words)

	SPS project: Vortex Generator (Site not responding. Last check: 2007-10-11)
		Vortex rings can also be found when charged particles travel through superfluid helium.
		The "Scientific American article by F. Reif, "Quantized Vortex Rings in Superfluid Helium", December 1964 is an excellent introduction to this.
		To make your own vortex ring generator out of a coffee can, see the December 1965 issue of Scientific American pages 109-113.
	cas.umkc.edu /physics/sps/projects/vortex/vortex.html (278 words)

	Vortex Basics
		The so-called ether is a scalar field surrounding each atomic or astronomical body which extends from a point of zero (still magnetic light) via spiraling, negative electrical vortices (gravity radiation) to the six planes of zero curvature at the boundaries of the cubic wave-field surrounding them.
		Photons are vortex systems of enfolded electricity (light) which rotate and balance their direction and combinations by polarity of spin with other similar systems to produce matter.
		These electrical radii extend in all directions (scalar field) and highly randomized manner and a so-called magnetic effect is not manifested, because their radial extensions pass through each other in all directions and are not aligned as a group as in the case of a bar magnet.
	www.vortexpluswater.com /vortex_basics.htm (4663 words)

	Vortex Ring State
		The rotor then transitions through the vortex ring state where there is a large recirculation of flow in the plane of the rotor, into autorotational flight and into the windmill brake state where the wake flow returns to a well-behaved periodic solution.
		Under these descending flight conditions, the helical pitch of the vortex filaments is smaller (filaments are closer together) and the wake is very much more prone to the onset of flow instabilities that may be caused by small disturbances at the rotor or elsewhere in the wake.
		Bundles of concentrated vorticity in the form of "rings" are continuously formed, and convect up and remain in the planes of the rotors, alternatively on the left rotor and then on the right rotor, and at a fairly low frequency.
	www.glue.umd.edu /~leishman/Aero/vring.html (6915 words)

	Hierarchical Colloidal Vortex Rings in a Constant Electric Field
		Each cluster consists of a rapidly circulating toroidal vortex in which spheres travel downward along the inner surface and return upward along the outside, completing one cycle in a few seconds.
		Most often, the dense ring of spheres is surrounded by a diffuse circulating corona that extends outward for tens of micrometers.
		These observations demonstrate that colloidal vortex rings emerge as a cooperative phenomenon among spheres driven both by electrokinetic forces and by gravity.
	www.physics.nyu.edu /grierlab/nringsb (747 words)

Try your search on: Qwika (all wikis)