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This fluid dynamics video was submitted to the Gallery of Fluid Motion forthe 2009 APS Division of Fluid Dynamics Meeting in Minneapolis, Minnesota. Dropevaporation is a simple phenomena but still unclear concerning the mechanismsof evaporation. A common agreement of the scientific community based onexperimental and numerical work evidences that most of the evaporation occursat the triple line. However, the rate of evaporation is still empiricallypredicted due to the lack of knowledge on the convection cells which developinside the drop under evaporation. The evaporation of sessile drop is morecomplicated than it appears due to the coupling by conduction with the heatingsubstrate, the convection and conduction inside the drop and the convection anddiffusion with the vapour phase. The coupling of heat transfer in the threephases induces complicated cases to solve even for numerical simulations. Wepresent recent experimental fluid dynamics videos obtained using a FLIR SC-6000coupled with a microscopic lens of 10 microns of resolution to observe theevaporation of sessile drops in infrared wavelengths. The range of 3 to 5microns is adapted to the fluids observed which are ethanol, methanol and FC-72since they are all half-transparent to the infrared.

Hydrothermal waves in evaporating sessile drops (APS 2009)