Numerical modeling of a two-dimensional vertical turbulent two-phase jet
Abstract
The results of numerically modeling two-dimensional two-phase flow of the "gas-solid particles" type in a vertical turbulent jet are presented for three cases of its configuration, namely, descending, ascending, and without account of gravity. Both flow phases are modeled on the basis of the Navier-Stokes equations averaged within the framework of the Reynolds approximation and closed by an extended k-ɛ turbulence model. The averaged two-phase flow parameters (particle and gas velocities, particle concentration, turbulent kinetic energy, and its dissipation) are described using the model of mutually-penetrating continua. The model developed allows for both the direct effect of turbulence on the motion of disperse-phase particles and the inverse effect of the particles on turbulence leading to either an increase or a decrease in the turbulent kinetic energy of the gas. The model takes account for gravity, viscous drag, and the Saffman lift. The system of equations is solved using a difference method. The calculated results are in good agreement with the corresponding experimental data which confirms the effect of solid particles on the mean and turbulent characteristics of gas jets.
- Publication:
-
Fluid Dynamics
- Pub Date:
- November 2012
- DOI:
- 10.1134/S0015462812060099
- Bibcode:
- 2012FlDy...47..769K
- Keywords:
-
- flow of the "gas-solid particles" type;
- vertical jet;
- gravity;
- modification of turbulence