Abstract
1. We study on the effects of particle size, projectional velocity and natural wind velocity for the travelling distance of spray particle.
2. Assuming that a particle in the air receives the air resistance given by stokes'law, moving equations are led, and then the travelling distances are calculated.
3. Flying velocity is more changeable for the smaller partcle sizes, and approach to the definite velocity-terminal velocity in the downward.
4. As to the falling times, the error in calculation with terminal velocity in 1m vertical distance is negregible small ins ize under 40μ in diameter, but in 0.5m distance limited particle size is under 25-30μ.
5. The travelling distances are larger for larger particle sizes and larger initial velocitcys, but on a vertical initial velocity, particles larger than a certain size are drifted on a same place approximately.
6. The smaller particles receive the larger effect by the natural wind velocity, and the effects for larger sizes become fewer.
7. On the test results with solid type nozzles, larger holes in diameter have the larger velocity coefficients and smaller maximum spray particles in diameter.
