Effect of change in solution concentration

Changing the size of narrowly distributed aerosols:

The size of narrowly distributed aerosols generated in the aerosols generator can be

controlled by controlling solution concentration (C _c)_., Minor flow rate (Q_m) and total flow rate (Q₁) .

Effect of change in solution concentration:

The size of aerosols with narrow size distribution can be varied by changing the concentration

of liquid solution according to the relation.

C_c= V_p/V_d= d_p³/d_d³

Where

C_c= Solution concentration

V_p= Volume of solute from which final particles are formed,

V_d= Volume of solvent

d_p= Diameter of particle and

d_d= Diameter of droplet

We know d_d because it is the cut off diameter of droplets in the virtual impactor . Forconstant

flow rate through the virtual impactor, the cut off diameter , d_d, in the virtual impactor is

always constant. Hnece, depending on the final particles diameters , d_prequired , the solution concentration, C_cis varied and vice-versa,

The particle diameter can be written as a function of aerodynamic diameter as follows:

d_p= D_pa( ῤ_a/ ῤ_p)^1/2 ………………….(1)

Where

D_pa= aerodynamic diameter of the particle,

ῤ_a= water density

ῤ_p= particle density.

Gives,

9µD(Stk)₅₀= ῤ_p (d p₅₀)² Q₁/A₁- ῤ_p U _p50/A₂ (Q₁- Q_m) …………….(2)

Where (St)₅₀ and d_5oare Stokes number and cut of diameter respectively at 50 % collection

efficiency, A₁ and A₃ are areas of major and minor flows respectively and Q₂= (Q₁- Q_m).

Subsequently, substituting equation

C_c= d_pa³/d_d³ * ( ῤ_a/ ῤ_p)^3/2 ……………………(3)

Above equation exhibits the relationship between aerodynamic diameter of the particle and

solution strength .

Thus, the solution strengths of DOP and ethyl alcohol were estimated and used to produce

narrow size distribution aerosols having number mean aerodynamic diameters of 1 µm , 2µm

, 3 µm and 4 µm. This test was carried out in set I of the virtual impact of with the

methodology as mentioned below.

Comments

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