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Spray (liquid drop)
A spray is a dynamic collection of drops dispersed in a gas.〔ASTM standard E-1620 Standard Terminology Relating to Liquid Particles and Atomization〕 The process of forming a spray is known as atomization. A spray nozzle is the device used to generate a spray. The two main uses of sprays are to distribute material over a cross-section and to generate liquid surface area. There are thousands of applications in which sprays allow material to be used most efficiently. The spray characteristics required must be understood in order to select the most appropriate technology, optimal device and size.〔Lipp, Charles W. , Practical Spray Technology: Fundamentals and Practice , 2012, ISBN 978-0-578-10090-6〕
==Spray formation==
Spray atomization can be formed by several methods. The most common method is through a spray nozzle which typically has a fluid passage that is acted upon by different mechanical forces that atomize the liquid. The first atomization nozzle was invented by Thomas A. DeVilbiss of Toledo, Ohio in the late 1800s His invention was bulb atomizer that used pressure to impinge upon a liquid, breaking the liquid into a fine mist. Spray formation has taken on several forms, the most common being, pressure sprayers, centrifugal, electrostatic and ultrasonic nozzle.
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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