Modeling of Flow Structure, Bubble Distribution, and Heat Transfer in Polydispersed Turbulent Bubbly Flow Using the Method of Delta Function Approximation

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.