The binary nucleation theory is extended to include vapor phase association. Similar to the effects found for pure vapors, two opposite influences due to stable association complexes have been derived. A kinetic one increases the nucleation rate and a larger, thermodynamic effect acts contradictory. The developed theory is applied to the waterndash;acetic acid system. Extensive experiments were performed in the unsteady rarefaction wave of a preheated shock tube. The variation of the measured critical supersaturation as a function of mixture composition was found to agree well with the predictions of the theory.
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