On the Character of the Blower Type Pest Control Machine (III)

Spraying Character of Power Duster for trial

Abstract

We studied on the most efficiencial method of the pest control. On this test, we used an axial flow type power duster for trial, and tested on various items on the places 5-70m. away from the machine, those items are control effect for disease of sweet potato, amount of deposited dust, and appearances of dust particles, under various climatic conditions. Amount of deposited dust was calculated from copper content in it. Dust particles were measured sizes and numbers by using microscope. Then we calculated coverd area using them.
The results are as follows:
1) We think the favorable wind velosity is about 1.0m. per sec.
2) Effect of the pest control on the places 30-70m. away was unifromly but unsatisfactory.
3) The control effect has same tendency to the coverd area, therefore the method of coverd area can be applied for a method in the pest control test.
4) One of the relations between the size of particle and its travelling distance is given below. By using this formula travelling distances of sprayedd and dusted particles, even if they are large or small sizes, can be calculated easily and immediately, Then
x; travelling distance m; mass of particle

H; height of nozzle ρ1; density of particle

V₀; velocity of Jet at nozzle r; radius of particle

V_x; velocity of flying particle η; coefficient of viscosity of air

V_s; wind velocity g; acceleration of gravity

x=18ηHV_s/ρ1gr²+0.78{(43.7ηHV₀/ρ1gr²+1)^0.53-1}
+rρ1/18ηV₀{(43.7ηHV₀/ρ₁gr²+1)^-0.47-1}