Abstract
A new mixing type CNC, the principle of which is based upon that of fog formation in the atmosphere caused by mixing of warm saturated air with cold air, has been developed. The principle of the CNC was examined from the viewpoints of counting efficiency of ultrafine particles and the droplet size after condensational growth as a function of particle number concentration and the quantity of condensable vapor; theory and experiment were found to agree. The CNC is capable of size analysis where the Kelvin equivalent diameter is detected. An ultrafine aerosol generator, having a liquid nitrogen quenching system, has been developed to obtain fairly monodisperse aerosol particles down to about 8 nm.
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