  Recent developments in fabrication techniques enabled the production of nano-
and angstrom-scale conduits. While scientists are able to conduct experimental
studies to demonstrate extreme evaporation rates from these capillaries,
theoretical modeling of evaporation from a few nanometers or sub-nanometer
meniscus interfaces, where adsorbed film, transition film and intrinsic region
are intertwined, is absent in the literature. Using the computational setup
constructed to identify the detailed profile of a nano-scale evaporating
interface, we discovered the existence of lateral momentum transport within and
associated net evaporation from adsorbed liquid layers, which are long believed
to be at the equilibrium established between equal rates of evaporation and
condensation. Contribution of evaporation from the adsorbed layer increases the
effective evaporation area, reducing the excessively estimated evaporation flux
values. This work takes the first step towards a comprehensive understanding of
atomic/molecular scale interfacial transport at extended evaporating menisci.
The modeling strategy used in this study opens an opportunity for computational
experimentation of steady-state evaporation and condensation at liquid/vapor
interfaces located in capillary nano-conduits.
