  We monitor the evaporation of a volatile liquid (ethanol) from an
inkjet-printed liquid film, consisting of a mixture of ethanol and ethylene
glycol. Interferometric video imaging technology is used for recording 2D vapor
concentration profiles over the evaporating film. The vapor flow is
reconstructed using numerical simulations. In this way, we reconstruct the
complete flow velocity profile, and distinguish diffusive and convective gas
transport flows, with quantitative tracking of the transport balances. The
convective flows are driven by the buoyancy of the solvent vapor in the ambient
air. In particular, we reconstruct the evaporation process from the interface
of the two-component liquid. We monitor the evaporation flows, implement
Raoult's and Henry's laws of vapor pressure reduction, as well as evaporation
resistivity. We observe the edge-enhancement of evaporation flows at the
wetting rims of the liquid film, and decompose the vapor flows in the diffusive
and the convective contribution. We demonstrate how Langmuir's evaporation
resistivity can be identified using vapor pressure profiles in the gas phase
data and mass transfer balances.
