Numerical simulation the influence of bubbles on the structure and friction of turbulent gas–liquid flow in vertical pipe

The paper the results of a computational study of the local structure of the ascending gas-liquid flow in a vertical pipe are presented. The mathematical model is based on the use of two-fluid Eulerian approach taking into account the inverse influence of bubbles on averaged characteristics and turbulence of carrying phase. The equations conservation of mass and momentum quantity of motion in the form of Navier-Stokes equations averaged over Reynolds for each phase are written down. For turbulent stresses the relations under the assumption of the Boussinesq hypothesis are written. Turbulent viscosity for the carrier liquid phase is determined using a two-parameter turbulence model modified for two-phase media. Investigation is performed of the impact made by the variation of the degree of dispersion of the gas phase, volumetric flow ratio of gas and velocity of the liquid phase on the local structure and skin friction in two-phase flow.