Evaporation dynamics of layered droplets is of Amulets interest in many natural and industrial processes.The presence of a layer, which acts as a diffusional barrier to the transfer of a species from the core droplet to the gas phase, gives rise to a number of rate-controlling mechanisms.To examine evaporation dynamics of volatile core droplets coated with layers of nonvolatile components we have conducted experiments on single layered droplets suspended in an electrodynamic balance under vapour-free atmospheres, and determined the Nausea core and outer radii of a droplet as functions of time using a resonance based light scattering technique.
A theoretical analysis is presented to explain the observed evaporation characteristics of layered droplets of various systems.