  Mass transfer of gaseous components from rising bubbles to the ambient liquid
can be described based on continuum mechanical sharp-interface balances of
mass, momentum and species mass. In this context, the standard model consists
of the two-phase Navier-Stokes equations for incompressible fluids with
constant surface tension, complemented by reaction-advection-diffusion
equations for all constituents, employing Fick's law. This standard model is
inconsistent with the continuity equation, the momentum balance and the second
law of thermodynamics. The present paper reports on the details of these severe
shortcomings and provides thermodynamically consistent model extensions which
are required to capture various phenomena which occur due to the multi-physics
of interfacial mass transfer. In particular, we provide a simple derivation of
the interface Maxwell-Stefan equations which does not require a time scale
separation, while the main contribution is to show how interface concentrations
and interface chemical potentials mediate the influence on mass transfer of a
transfer component exerted by the change in interface energy due to an
adsorbing surfactant.
