AEROSOL SPECTROMETER AND ITS APPLICATION 169 
TasLe 1—Values of operational characteristics 
N O ON F Ur 70 ‘Ymin Py riae | d@max dmin 
rpm | mm cm/min | lit/min cm/sec sec g g m mm 
6,000 1D 900 2.48 1.27 520 1,580 2.4 0.5 
12,000 1.5 180 4.95 0.64 2080 6,100 2.6 0.38 
18,000 1.5 270 7.40 0.438 4670 13: 750: 2.5 0.30 
12,000 | 10 120 3.30 0.96 | 2080 6,100 2.2 0.23 
24,000 1.0 240 6.60 0.48 8300 24 , 500 2.0 0.16 
18,000 | 0.75 135 3.70 0.85 4670 13,750 1.8 0.10 
24,000 0.75 180 4.95 0.64 8300 24,500 ee 0.07 
24,000 0.50 120 3.30 0.96 | 8300 24,500 | 1.2 | 0.025 
N=18,000 
0= 30840 
d=0.37p d=0.19p 
Tg=Tg=252 
P d=0.564p P 
N=12,000 
0= 40 & 60 
Fic. 4—Photographs (a) typical foil deposits from latex aerosols of defined particle diameter d, indi- 
cating the values of Ly , corresponding to the variation with O and d; (b) the same showing shadow from 
inserted pins P, protruding from the foil into the channel, indicating laminar flow 
of the outer envelope of the rotor; that is, the 360° sin a, and the radii 7) = ro’ cosee a, and 
outer envelope represents the surface of the frus- 7 = 7’ cosec a. 
trum of a cone of the (half) angle a and the radii Similarly the locus of that fraction of the foil 
ro’, Ti’ (see Fig. 5), and thus develops on a plane surface is defined which has formed the outer 
the sector of an annulus with the angle w = walls of the helical channels. The development of 
