TITLE

Use of a turbulent mixing CNC to study the influence of composition and vapor properties on heterogenous nucleation

AUTHOR(S)
Hopke, Philip K.; Lee, D. W.; Mavliev, Rashid; Wang, Hwa-Chi
PUB. DATE
August 2000
SOURCE
AIP Conference Proceedings;2000, Vol. 534 Issue 1, p139
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
A new method for changing the supersaturation in the Turbulent Mixing CNC has been developed and used to study the influence of composition and vapor properties on heterogeneous nucleation. Supersaturation was controlled by changing the condensing vapor pressure in nozzle flow by saturating only a predetermined part of the flow while the total flow and temperature remain constant. This approach allows changing the initial vapor pressure while keeping the flow structure and temperature field unchanged. Experimental results for transitions from heterogeneous nucleation to homogeneous nucleation are presented for NaCl and WOx particles at various DBP vapor pressures. With increasing of the DBP vapor pressure, the concentration of enlarged particles increases until it reaches a plateau. At higher initial values of DBP pressure, homogeneous nucleation prevails and the number concentration of particles follows a curve typical for homogeneous nucleation recorded in the absence of nuclei. Nuclei with different mobility diameters were activated at different values of vapor pressure. There are significant differences in the slopes of particle activation curves for NaCl and WOx particles. The reasons for such differences are the subject for continuing research.
ACCESSION #
5669811

 

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