TITLE : MODELLING TURBULENT 2-PHASE FLOW IN A BUBBLE-STIRRED LADLE
BY : CHAM Development Team - M R Malin
FOR : PHOENICS Validation of 2-Phase Modelling Options
- Two-dimensional turbulent 2-phase bubbly air-water flow in a ladle.
- Cylindrical-polar computational grid.
- Interphase momentum transfer modelled using the 'dirty-water' drag
correlation of Kuo and Wallis.
- Turbulence represented via the k-e turbulence model with additional
source terms to account for bubble-induced turbulence.
- The IPSA algorithm is used, although the GENTRA algorithm would serve
- The gas-stirring of ladles is of practical importance in
metallurgical processes such as de-gassing and de-sulfurisation.
- These flows have been studied experimentally and numerically by
Johanssen et al .
- The ladle height is 1.237m and the ladle diameter is 1.016m.
- Air enters through a centrally-located 0.05m diameter plug at a
flow rate of Q=610cm**3/s, and leaves through the free surface.
- The column of bubbles rising through the ladle induces a gross
clockwise circulation of the liquid due to momentum interaction
between the two phases.
- The bubble diameter is taken as 3mm.
- The mesh employed uses 20 radial and 30 axial cells.
BUBBLE-STIRRED LADLE: Water velocity vectors
BUBBLE-STIRRED LADLE: Water vertical velocity profiles at z/H=0.505
BUBBLE-STIRRED LADLE: Water vertical velocity profiles at z/H=0.903