BY : CHAM Development Team - M R Malin

FOR : PHOENICS Validation of 2-Phase Modelling Options

- 2D turbulent 2-phase bubbly air-water flow in a bubble column.
- Cylindrical-polar computational grid.
- Bubble column dimensions: diameter = 0.288 m height = 4.25 m.
- Interphase momentum transfer accounts for drag with bubble distortion, virtual mass forces and lift forces.
- Turbulence represented via the k-e turbulence model with additional source terms to account for bubble-induced turbulence.
- The bubble diameter is taken as 10mm.
### NOTES :

- Bubble column studied experimentally and numerically by Svendsen et al [1990, 1992]; measurements taken at a height of 1.6 m.
- Air and water enter uniformly at the base of the column with inlet superficial velocities of 0.08m/s and 0.01m/s, respectively.
- The inlet void fraction is taken as 0.2.
- Both phases are allowed to leave at the top of the column.
- The expected flow pattern is a clockwise liquid circulation, with upflow at the column centre and downflow at the outer wall.
- The mesh employed uses 15 radial by 13 vertical cells.

1. Water velocity vectors. 2. Air velocity vectors. 3. Void-fraction contours. 4. Void-fraction profiles at z=1.6m. 5. Water vertical-velocity profiles at z=1.6m.

TRONDHEIM BUBBLE COLUMN: Water velocity vectors

TRONDHEIM BUBBLE COLUMN: Air velocity vectors

TRONDHEIM BUBBLE COLUMN: Void-fraction contours

TRONDHEIM BUBBLE COLUMN: Water vertical-velocity profiles at z=1.6m