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We monitor the evaporation of a volatile liquid (ethanol) from aninkjet-printed liquid film, consisting of a mixture of ethanol and ethyleneglycol. Interferometric video imaging technology is used for recording 2D vaporconcentration profiles over the evaporating film. The vapor flow isreconstructed using numerical simulations. In this way, we reconstruct thecomplete flow velocity profile, and distinguish diffusive and convective gastransport flows, with quantitative tracking of the transport balances. Theconvective flows are driven by the buoyancy of the solvent vapor in the ambientair. In particular, we reconstruct the evaporation process from the interfaceof the two-component liquid. We monitor the evaporation flows, implementRaoult's and Henry's laws of vapor pressure reduction, as well as evaporationresistivity. We observe the edge-enhancement of evaporation flows at thewetting rims of the liquid film, and decompose the vapor flows in the diffusiveand the convective contribution. We demonstrate how Langmuir's evaporationresistivity can be identified using vapor pressure profiles in the gas phasedata and mass transfer balances.

Imaging and simulation-based analysis of evaporation flows over wetting edges