Paper presented at the 6th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, South Africa, 30 June - 2 July, 2008.
An Eulerian-Eulerian two-fluid mathematical model is
used to numerical simulation of two-phase flow caused by the
gas injection into a vertical cylinder. The cylinder is filled with
castor oil of which the kinematics viscosity is sufficiently large
to ensure liquid flow to be in the laminar regime. The
mathematical model used in this study, solves transport
equations for the variables of each phase with an allowance for
interphase mass and momentum exchange. The governing
equations are discreted by the finite volume technique and then
are solved by SIMPLE staggered grid solution technique. In
order to increase the accuracy of calculations, the power-law
scheme is employed to approximate the convection and
diffusion terms. It is found that the radial components of
bubbles velocities are much smaller than the corresponding
axial ones, and the bubbles move up almost vertically.
Predictions of the proposed model agree closely with a number
of published experimental data.