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venturi effect : ウィキペディア英語版
venturi effect

The Venturi effect is the reduction in fluid pressure that results when a fluid flows through a constricted section of pipe. The Venturi effect is named after Giovanni Battista Venturi (1746–1822), an Italian physicist.
==Background==
In fluid dynamics, a fluid's velocity must ''increase'' as it passes through a constriction in accord with the principle of continuity, while its static pressure must ''decrease'' in accord with the principle of conservation of mechanical energy. Thus any gain in kinetic energy a fluid may accrue due to its increased velocity through a constriction is balanced by a drop in pressure.
By measuring the change in pressure, the flow rate can be determined, as in various flow measurement devices such as venturi meters, venturi nozzles and orifice plates.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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