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+1.86
di/r.
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