Turbulence behind a vessel.

Related Terms

ANTI-TRIP CHINE

A flared out aft section of the side/bottom of the boat. The purpose is to prevent the hard chine of the boat catching a wake or small wave on a sharp turn.

ORIFICE MIXER

Arrangement in which two or more liquids are pumped through an orifice constriction to cause turbulence and consequent mixing action.

ANTI-OXIDANT

Additive that prolongs the induction period of a base oil in the presence of oxidizing conditions and catalyst metals at elevated temperatures. The additive is consumed and degradation products increase not only with increasing and sustained temperature, but also with increases in mechanical agitation or turbulence and contamination: air, water, metallic particles, and dust.

TURBULENT FLOW SAMPLER

A sampler that contains a flow path in which turbulence is induced in the main stream by abruptly changing the direction of the fluid.

IONOSPHERIC STORM

An ionospheric disturbance characterized by wide variations from normal in the state of the ionosphere, such as turbulence in the F-region, absorption increase, height increase, and ionization density decreases. The effects are most marked in high magnetic latitudes and are associated with abnormal solar activity.

TURBULENT FLOW

Characteristically random flow patterns that form eddies from large to small scales. For internal flows, it occurs at Reynolds numbers greater than 4000. Turbulence is integral to the mixing process between the fuel and air for combustion.

TRANSITIONAL FLOW

Transitional flow is a mixture of laminar and turbulent flow, with turbulence in the center of the pipe, and laminar flow near the edges. Each of these flows behave in different manners in terms of their frictional energy loss while flowing and have different equations that predict their behavior. 2300 < Re < 4000 (Reynolds number)

WIND SHEAR

A change in wind direction or speed in a short distance, resulting in a shearing effect. It can act in a horizontal or vertical direction and, occasionally, in both. The degree of turbulence increases as the amount of wind shear increases.

WHISTLE

A sound signal emitter comprising a resonator having an orifice of suitable shape such that when a jet of air is passed through the orifice the turbulence produces a sound.

TURBULENCE

A deviation from parallel flow in a pipe due to rough inner walls, obstructions or directional changes.

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