Chapter 3: Evaporation of Ternary Sessile Drops

This chapter is concerned with drying ternary sessile droplets, where the three liquid components have different volatilities and mutual solubilities. The drying process can trigger concentration gradients within the droplet, leading to spontaneous phase separation and intense interfacial flows. We give a summary of several cases which we have introduced in previous work. To gain an insight into the physicochemical hydrodynamics, we also numerically simulate the droplet evaporation process. The ternary droplet discussed here can be seen as a basic model system for more complicated multicomponent droplet systems in practical applications, involved in material science, chemical engineering, or bioengineering.