vortices - translation to αραβικά
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vortices - translation to αραβικά

FLUID FLOW REVOLVING AROUND AN AXIS OF ROTATION
Vortical; Vortices; Vortexing; Forced vortex; Free vortex; Free-vortex; Forced-vortex; Vortexes; Irrotational vortex; Irrotational vortices
  • C-17]] uses high engine power at slow speed on a wet runway.
  • animation]].)
  • An irrotational vortex
  • Vortices formed by milk when poured into a cup of coffee
  • A rigid-body vortex
  • Saturn's]] north polar vortex
  • A plughole vortex
  • [[Kármán vortex street]]s formed off the island of [[Tristan da Cunha]]
  • A [[Kármán vortex street]] is demonstrated in this photo, as winds from the west blow onto clouds that have formed over the mountains in the desert. This phenomenon observed from ground level is extremely rare, as most cloud-related Kármán vortex street activity is viewed from space

VORTICES         

ألاسم

دُرْدُور ; دَوَّارَة ; دُوَّامَة

vortices         
‎ دُوَّارات‎
VORTEXES         

ألاسم

دُرْدُور ; دَوَّارَة ; دُوَّامَة

Βικιπαίδεια

Vortex

In fluid dynamics, a vortex (PL: vortices or vortexes) is a region in a fluid in which the flow revolves around an axis line, which may be straight or curved. Vortices form in stirred fluids, and may be observed in smoke rings, whirlpools in the wake of a boat, and the winds surrounding a tropical cyclone, tornado or dust devil.

Vortices are a major component of turbulent flow. The distribution of velocity, vorticity (the curl of the flow velocity), as well as the concept of circulation are used to characterise vortices. In most vortices, the fluid flow velocity is greatest next to its axis and decreases in inverse proportion to the distance from the axis.

In the absence of external forces, viscous friction within the fluid tends to organise the flow into a collection of irrotational vortices, possibly superimposed to larger-scale flows, including larger-scale vortices. Once formed, vortices can move, stretch, twist, and interact in complex ways. A moving vortex carries some angular and linear momentum, energy, and mass, with it.

Παραδείγματα από το σώμα κειμένου για vortices
1. "To get large areas of rotating air, you need smaller vortices to act as building blocks.
2. Those vortices happen to match the natural vibrating frequencies of the motor‘s combustion chamber, and the combination causes the shaking.
3. The spacecraft will also gather data on the whirlpool–like atmospheric vortices at Venus‘s poles, another phenomenon that has no explanation.
4. The scientists have already used VTD with DOW data to analyze a large and intense tornado that struck Mulhall, Okla., in 1'''. They discovered a central downdraft, similar to the eye of a hurricane, surrounded by a ring of updrafts blowing at near–hurricane force, with multiple small vortices rotating around this ring.
5. The shaking problem, which is common to solid rocket boosters, involves pulses of added acceleration caused by gas vortices in the rocket similar to the wake that develops behind a fast–moving boat, said Arenas, who has researched vibration and space–launch issues.