The kinetics of droplet migration in solids in an accelerational field

The kinetics of brine droplet motion in a KC1 crystal exposed to an accelerational field 50 000 times gravity were studied as a function of droplet size. The droplet velocity was found to decrease with decreasing droplet size, falling to zero below a critical droplet size. This behaviour indicates that the rate of droplet migration is controlled by the kinetics of deposition and dissolution at the solid-liquid interfaces of the droplet. From this experiment the critical undersaturation necessary to produce any KC1 dissolution was found to be two-tenths of a part per million. Finally, in moving droplets, it was established that the velocity of the dissolving interface increases linearly with the undersaturation at this interface.