The technique of Doyle [J. Chem. Phys. 35, 795 (1961)] for finding the equilibrium saddle point on the free energy surface of a two-component liquid droplet is criticized. His method is related to modifications of the Laplace equation for the excess pressure inside a droplet and the Kelvin equation for the excess vapor pressure of its constituents. These changes incorrectly account for the variation of surface tension with composition.
An aerosol particle size analyzer based on a laser Doppler velocimeter (LDV) has been developed to measure the aerodynamic diameter da of individual particles and droplets in real time. The particles are electrically charged and then passed through a 40-kHz electric field. The phase lag φ of the particle motion with respect to the field is measured by the LDV. A microcomputer determines da from φ and stores the aerodynamic size distribution of the sampled particulates. The analyzer has counted and sized particles at a maximum rate of 200 particles/s in the size range of 0.3–5.0 μm in aerodynamic diameter.
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