Optimal Parameters of Aerosol

the optimal size is evidently such that the particles are displaced across the channel by the two independent deposition processes in the same time. Approximately (without integrating over the channel cross section), the condition can be written like 

Under common conditions, the calculated value of the particulate diameter is of the order 0.1 pm see also Ref. [40], It means that Bn 10-6cm2 s 1 and tOpS fa 10-4 cm s-1 the latter velocity is established within a very short relaxation time of Wps/gg = 10-7 s. According to Eq. 2.45, the steady deposition length /o.p is  

at the above Dbn value, in ideal conditions, with a 0.3 cm i.d. capillary and w = 10 cm s-1, the theoretical length would reach kilometers. 

The next step is estimation of the number concentration of the particulates necessary to guarantee that all tracer molecules deposit on the aerosol within a certain time. Porstendorfer [41] found that the volume op exhausted by a spherical particulate per second is 

Experimental measurements [41] of the uptake of 212Po atoms by a latex-aerosol in the range of radii from 0.05 to 1 pm gave np values between 1 x 1(T6 to 

---