Spray nozzles can have one or more outlets a multiple outlet nozzle is known as a compound nozzle. Spray nozzles are of great importance for many applications, where the spray nozzle is designed to have the right spray characteristics.
A wide variety of spray nozzles exist, that make use of one or multiple liquid breakup mechanisms, which can be divided into three categories: liquid sheet breakup, jets and capillary waves. The production of a spray requires the fragmentation of liquid structures, such as liquid sheets or ligaments, into droplets, often by using kinetic energy to overcome the cost of creating additional surface area. A spray nozzle or atomizer is a device that facilitates the dispersion of a liquid by the formation of a spray.
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