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Vortex drag

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Read Also:

• Vortex ring

  noun 1. a stable perturbation in a fluid that takes the form of a torus in which the flow rotates in the section of the torus so that the pressure difference between the inside and outside of the torus balances body forces. The best-known vortex ring is a smoke ring

• Vortex shedding

  noun 1. the process by which vortices formed continuously by the aerodynamic conditions associated with a solid body in a gas or air stream are carried downstream by the flow in the form of a vortex street See also vortex street

• Vortex street

  noun 1. a regular stream of vortices or parallel streams of vortices carried downstream by the flow of a fluid over a body. These are sometimes made visible by vapour condensation as in the vortex trails from the wing tips of an aeroplane See also Kármán vortex street, vortex shedding

• Vortex vein

  vortex vein n. Any of the veins in the tunica vasculosa that are formed of branches from the posterior surface of the eye and the ciliary body and empty into the superior or the inferior ophthalmic vein. Also called vorticose vein.

• Vorticella

  noun, plural vorticellae [vawr-tuh-sel-ee] /ˌvɔr təˈsɛl i/ (Show IPA), vorticellas. 1. any ciliated protozoan of the genus Vorticella, having a transparent, bell-shaped body with a retractile stalk. noun (pl) -lae (-liː) 1. any protozoan of the genus Vorticella, consisting of a goblet-shaped ciliated cell attached to the substratum by a long contractile stalk

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