Abstract
The structures of farm-use nozzles for pest control are very different in types. The structure, the type of atomising mechanism, groove diameter (di), groove angle to nozzle axis (θ), diamter and height of swirl chamber (D and h), and diameter and length of nozzle disc hole (de and l) infulence to the nature of spraying atomisation. Investigating the various types of nozzles, I knew, atomiser constant (K) connects with ratio of groove diameter and the radius of swirl chambrer (di/r) in the equation of K=-0.18+1.86di/r.
