“TURBULENT MIXING dilutes the concentration of droplets, thereby reducing the competition for the available vapor, and enhancing the growth rate of favored droplets. Thermodynamically the mixing of sub-saturated air requires net evaporation, either by reducing the number of droplets in the saturated air after the mixing, or by reducing the size of the droplets.” (Inhomogeneous mixing).
http://www.mpimet.mpg.de/fileadmin/staff/stevensbjorn/teaching/skript-5.pdf