How does a vortex ring work?

A toroidal, or doughnut-shaped, vortex is formed when fluid flows back on itself, making a spinning ring around an invisible core. These water-based vortices are invisible to the eye, but cetaceans blow air into the vortex, which gets caught up in the core of spinning water as bubbles and forms a visible ring.

Why is the vortex ring diameter increasing?

It is noted from figure 7 that the ring diameter increases with increase in stroke length at all the Reynolds numbers. It is due to the fact that the ejected fluid has higher volume for larger stroke lengths, and thus gets included in the circulation of the vortex ring thereby increasing the vortex ring diameter.

What is Vertex ring?

This singular style is a cocktail ring with few equals, instantly elevating any outfit with its dramatic lines and bold sparkle. This style has been discontinued.

What creates a vortex?

A vortex is a physics phenomenon that occurs when a gas or a liquid moves in circles. At the center is a vortex line that the matter swirls around. They are formed when there is a difference in the velocity of what surrounds the line. Hurricanes, tornadoes and air moving over a plane wing are examples of vortices.

What is a bubble ring in the ocean?

A bubble ring, or toroidal bubble, is an underwater vortex ring 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 poloidally as it travels through the water, much like a flexible bracelet might spin when it is rolled on to a person’s arm.

What is vortex strength?

The ‘strength’ of a vortex tube (also called vortex flux) is the integral of the vorticity across a cross-section of the tube, and is the same everywhere along the tube (because vorticity has zero divergence).

What is a underwater vortex?

Vortices are essentially a swirling mass of water or air (like a whirlpool or whirlwind) A breaking wave forms when the amplitude (highest point) of a surface wave becomes so high that the tip of the wave overturns and plunges forward.

Why are smoke rings stable?

Thus, a vortex ring can carry mass much further and with less dispersion than a jet of fluid. That explains, for instance, why a smoke ring keeps traveling long after any extra smoke blown out with it has stopped and dispersed.

Where does water move the fastest in a vortex?

The tornado you see is actually a vortex. In a vortex, the fluid on the outside has to move faster than the fluid on the inside to keep up. This is why strong winds can be felt far away from the tornado and the eye of a hurricane is calm.

What is the vortex effect?

In The Year of Magical Thinking, Joan Didion’s memoir about the death of her husband and her daughter’s sudden sickness, Didion describes being paralyzed by memories of her family triggered during mundane circumstances. She calls this experience “the vortex effect.”

Which is the dominant flow in a vortex ring?

A vortex ring, also called a toroidal vortex, is a torus -shaped vortex in a fluid or gas; that is, a region where the fluid mostly spins around an imaginary axis line that forms a closed loop. The dominant flow in a vortex ring is said to be toroidal, more precisely poloidal.

Who was the first scientist to study vortex rings?

Vortex rings were first mathematically analyzed by the German physicist Hermann von Helmholtz, in his 1858 paper On Integrals of the Hydrodynamical Equations which Express Vortex-motion. The formation, motion and interaction of vortex rings have been extensively studied.

Where does the commutative ring theory come from?

Commutative ring theory originated in algebraic number theory, algebraic geometry, and invariant theory. Central to the development of these subjects were the rings of integers in algebraic number fields and algebraic function fields, and the rings of polynomials in two or more variables.

Where does the vortex ring form in the heart?

A vortex ring is formed in the left ventricle of the human heart during cardiac relaxation ( diastole ), as a jet of blood enters through the mitral valve. This phenomenon was initially observed in vitro and subsequently strengthened by analyses based on color Doppler mapping and magnetic resonance imaging.