  This paper presents a method for modelling interfacial mass transfer in
Interface Capturing simulations of two-phase flow with phase change. The model
enables mechanistic prediction of the local rate of phase change at the
vapour-liquid interface on arbitrary computational meshes and is applicable to
realistic cases involving two-phase mixtures with large density ratios. The
simulation methodology is based on the Volume Of Fluid (VOF) representation of
the flow, whereby an interfacial region in which mass transfer occurs is
implicitly identified by a phase indicator, in this case the volume fraction of
liquid, which varies from the value pertaining to the "bulk" liquid to the
value of the bulk vapour. The novel methodology proposed here has been
implemented using the Finite Volume framework and solution methods typical of
"industrial" CFD practice. The proposed methodology for capturing mass transfer
is applicable to arbitrary meshes without the need to introduce elaborate but
artificial smearing of the mass transfer term as is often done in other
techniques. The method has been validated via comparison with analytical
solutions for planar interface evaporation and bubble growth test cases, and
against experimental observations of steam bubble growth.
