Macrokinetics of physicochemical condensation in two-phase systems of the gas-solid body type

The macrokinetics of the phase evolution at the microscopic level under isothermal and nonisothermal conditions is analyzed theoretically within the framework of a two-scale approach for describing physicochemical condensation processes in two-phase systems. Scenarios are established for the transformation of the condensed particles in a chemically active medium, taking into account the exothermal nature of the reaction, the finiteness of heat- and mass-transfer rates, and the phase transformations. The equilibrium constant of the heterogeneous reactions is shown to have a significant effect on the conditions of evaporation, or the increase in the incipient condensation phase. An analytical criterion is obtained for controlling the phase transformation in a reaction-capable medium, and it is supported by numerical calculations.