A thermodynamically consistent numerical framework for the simulation of three-dimensional sublimation processes of ice at temperatures below the triple point and low pressure is presented. To this ...end, a novel description of the local thermodynamic equilibrium of frozen water (ice) and a mixture of water vapour and an inert gas is derived, where anisotropic surface energy densities can be considered. A new correlation for the diffusion coefficient of water vapour in nitrogen is proposed based on equilibrium molecular dynamics simulations. The simulation results are in excellent agreement with experimentally obtained sublimation rates.
The method for calculating the temperature-humidity mode of brick and reinforced concrete chimneys is presented. The processes of heat exchange of combustion products in the gas volume of the ...chimneys and heat and mass transfer in it’s walls also, are modeled. The parameters of vapour transfer in the walls of reinforced concrete chimneys in various operating modes of the boiler plant are calculated. The range of flue gases parameters at which the "dry" operating mode of a reinforced concrete chimneys is realized is determined.
