  Studies of the transport of wet water vapour are relevant for various areas
of human activity, including the construction and production of building
materials, mining, agriculture, environmental safety of technological
processes, scientific research. In particular, one of the methods for
extracting highly viscous bitumen grades of oil from the subterranean depths is
based on the dilution of the contents of the porous medium by means of pumping
coolants. The simplest and environmentally friendly coolant is wet steam
containing small drops of water. In addition, with the help of heated water
vapour, the filtering elements of collectors are cleaned from sediments of the
solid phase (for example, paraffins, gas hydrates and ice floes) on the walls
of the porous medium. For realistic modeling of the processes of filtration and
heat and mass transfer during the injection of wet steam into a porous medium,
it is necessary to investigate the characteristics of the interaction of
saturated water vapour with individual through-type pores. In this paper, a
study was carried out through mathematical modelling of the dependence of the
diffusion rate of wet water vapour on the pressure difference outside the pore
that occurs when water vapour is injected into a porous medium. The
dependencies of the diffusion rate on the pore cross section, the magnitude of
vapour adsorption on the pore walls, as well as the effect of water vapour
temperature on all these processes were also investigated. Practical interest
is the study of the influence of the rate of cooling of water vapour on the
diffusion rate and the adsorption of water vapour on the wall of the pores. The
calculations were carried out using a hybrid type model that combines molecular
dynamics and macro-diffusion approaches to describe the interaction of water
vapour with individual pores.
