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A nozzle is a device designed to control the direction or characteristics of a fluid flow (especially to increase velocity) as it exits (or enters) an enclosed chamber or pipe. A nozzle is often a pipe or tube of varying cross sectional area, and it can be used to direct or modify the flow of a fluid (liquid or gas). Nozzles are frequently used to control the rate of flow, speed, direction, mass, shape, and/or the pressure of the stream that emerges from them. In a nozzle, the velocity of fluid increases at the expense of its pressure energy.

[ "Thermodynamics", "Aerospace engineering", "Composite material", "Utility model", "Mechanical engineering", "Lance device", "Tundish", "diesel spray", "Onboard refueling vapor recovery", "Abrasive jet machining" ]
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