How well are supersaturation and temperature in expansion chambers predicted by the Poisson-equation?

Zach, S.; Vrtala, A.; Reischl, G. P.; Wagner, P. E.
August 2000
AIP Conference Proceedings;2000, Vol. 534 Issue 1, p335
Academic Journal
Various experimental studies of nucleation processes have been reported, which were performed using expansion chambers. In these studies the gas temperatures and vapor supersaturations at the end of the adiabatic expansions considered have usually been determined by means of the Poisson equation. Recently, deviations from the Poisson equation were reported and an empirical correction has been suggested. In the present study gas temperatures and vapor supersaturations at the end of adiabatic expansions were experimentally determined from quantitative measurements of condensational drop growth rates. Except for one expansion at an extremly high expansion ratio no significant deviations from the Poisson equation were found. The trend predicted by the empirical relation has not been observed experimentally.


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