The results of modeling of flow structure, air bubble distribution over the pipe cross section, and heat transfer in a vertical polydispersed gas-liquid flow are presented. Themathematical model is based on the Euler description with allowance for the back effect of bubbles on the averaged characteristics and turbulence of the carrier phase. The polydispersity of two-phase flow is described by the delta approximation method with consideration of bubble break-up and coalescence. The turbulence of the carrier phase is predicted using the Reynolds stress transport equations. The results of the modeling showed good agreement with experimental and numerical data of other works.
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The numerical results were obtained with partial financial support from the grant of the Russian Foundation for Basic Research (RFBR project No. 18-08-00477), and the mathematical model was developed as part of the IT SB RAS state assignment (program AAAA-A17-117030310010-9). The authors thank Dr. R. Mukin (Paul Scherrer Institute, Villingen, Switzerland) for providing data from MTLOOP experiments and his own numerical calculations in electronic form.
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Pakhomov, M.A., Terekhov, V.I. Modeling of Flow Structure, Bubble Distribution, and Heat Transfer in Polydispersed Turbulent Bubbly Flow Using the Method of Delta Function Approximation. J. Engin. Thermophys. 28, 453–471 (2019). https://doi.org/10.1134/S1810232819040015