Spray Nozzles 33
Spray Nozzles 33 : Spray Characteristics 12: Factors Affecting Drop Size: Nozzle Type and Capacity: Full cone nozzles have the largest drop size, followed by flat spray nozzles. Hollow cone nozzles produce the smallest drop size. Spraying pressure: Drop size increases with lower spraying pressure and decreases with higher pressure. Flow rate: Flow rate has a direct effect on drop size. An increase in flow rate will increase the pressure drop and decrease the drop size, while a decrease in flow rate will decrease the pressure drop and increase the drop size. Spray angle: Spray angle has an inverse effect on drop size. An increase in spray angle will reduce the drop size, whereas a reduction in spray angle will increase the drop size. Liquid properties: Viscosity and surface tension increase the amount of energy required to atomize the spray. An increase in any of these properties will typically increase the drop size. Within each type of spray pattern the smallest capacities produce the smallest spray drops, and the largest capacities produce the largest spray drops. Volume Median Diameter (VMD) is based on the volume of liquid sprayed; therefore, it is a widely accepted measure
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