Spray nozzles are now used in various fields such as agriculture, chemical industry, etc., especially for cooling and dusting devices.
The most important aspect of the characteristics of spray nozzles is droplet size and spray volume distribution. In general, the purpose of almost all spraying is to spray uniformly over the area of spraying. However, it is important to ensure uniform distribution because the spray volume distribution radially from the spray center is not uniform and different distribution patterns are found depending on the flow rate.
Kim Song Won, a researcher at the Faculty of Mechanical Science and Technology, conducted an experimental study on the jet characteristics of a pressure swirling nozzle used for the design of a large cooling tower spraying system, and analyzed the effects of spray water flow rate and the structure of a nozzle outlet and a vortex vane on the spray characteristics.
The study confirmed the following.
First, the droplet size required for the large cooling tower can be achieved by a type X vortex vane in the range of 500 μm to 1000 μm, and the spray volume distribution becomes almost uniform when the vane angle is 120° and the spray flow rate is large.
Second, the smaller the flow rate is, the greater spray volume is concentrated in the spray center, and the larger the flow rate is, the lower the spray volume concentration peak gets and it moves radially.
Third, the length of the nozzle exit section does not significantly affect the spray characteristics in the pressure swirling atomization nozzle.
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