On the Character of the Blower Type Pest Control Machine. (II)

Distance reached by the particles sprayed by Mist Blower

Abstract

1. Size of sprayed particles, the velocity of the wind and the distance reached by the particles were observed using the new Mist Blower.
2. Weakness of the velocity of the stream has no relation to revolution and is indicated as follows;
V/V₀=0.0363X^-1.533
Then V: Wind velocity at measuring point.
V₀: Initial wind velocity at nozzle.
X: Distance from nozzle to measuring point.
3. Applying Stokes' law, this formula will be converted into;
X=4.5ηH/ρ₁gr²{0.157V₀^0.3948(ηH/ρ₁gr²)^-0.6052+V_c}
Then X: Arrival distance of particle.
r: Radius of particle.
η: Viscosity coeficient of air.
ρ₁: Specific weight of a particle.
H: Height of nozzle from land.
g: Acceleration of gravity.
V_c: Natural wind velocity.
This formula does not coincide with actual obtained values due to not considering of diffusion, vortex and rising air current. Therefore, further study with respect to these points and dust paticles is expected.