Based on data obtained in the previous experimental study conducted by the authors, two approaches are proposed for analytical and numerical modeling of a critical two-phase flow in a pipe with a granular layer. An analytical approach is based on a polytrophic model, while a numerical approach was developed using a smoothed particle hydrodynamics method. A model of isenthalpic flow of vapor–water mixture in a fixed bed of solid particles is considered is this study. The mixture expansion process is considered to be polytropic. Similarly to the known problem of gas dynamics of a granular bed, an analytical relationship for calculation of a critical mass velocity was obtained. The results of the calculation based on the analytical and numerical models were compared with the experimental data and agreement between analytical and numerical data and the experiment was observed.
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Pokusaev, B.G., Tairov, E.A., Khan, P.V. et al. Numerical and Analytical Approaches to Modeling Critical Two-Phase Flow with Granular Layer. J. Engin. Thermophys. 27, 20–29 (2018). https://doi.org/10.1134/S1810232818010022