Experimental Study of Substrate Temperature Effect on the Behavior of Droplet Evaporation of Binary Mixtures

Evaporation of droplets has caught a lot of scientific attention due to its significance in numerous industrial applications, such as heat pipes, evaporative self-assembly, and capillary tubes to name a few. Many researchers have shown that the maximum evaporation rate takes place very close to the three-phase contact line. The evaporation rate of the droplet plays an important role to control the evolution of the droplet, i.e. base diameter as well as contact angle change with time. Literature survey showed that very few papers have examined the substrate temperature and therefore the evaporation rate effect on the droplet evolution. This work investigates experimentally the droplet evolution of binary mixtures under different substrate temperatures. Infrared thermography is utilized as a tool to study the temperature variation of the droplet surface as evaporation takes place.