TITLE : MODELLING OF TWO-PHASE AIR-WATER FLOW IN A BUBBLE COLUMN

BY : CHAM Development Team - M R Malin Rhone Poulenc Industrialisation - N Boisson

FOR : Rhone Poulenc Industrialisation, France

DETAILS :

• Two-Dimensional Transient Two-Phase Bubbly Air-Water Flow.
• Cylindrical-polar computational grid.
• Bubble column dimensions: diameter = 0.138 m height = 1.37 m.
• Interphase momentum transfer accounts for drag with bubble distortion, virtual mass forces, lift forces and interfacial pressure forces.
• Turbulence represented by a modified k-e turbulence model which accounts for bubble-induced turbulence production.

NOTES :

• Bubble column studied experimentally by Hills and measurements taken at a height of 0.6 m.
• The bubble column is initially completely filled with water, and air is injected uniformly at the base of the column and allowed to leave through the liquid surface at the top of column.
• Transient calculation is carried out until steady state is reached.
• Inlet air superficial velocity = 0.038 m/s.
• Bubble diameter = 7.5mm

HILLS BUBBLE COLUMN: Water velocity vectors
HILLS BUBBLE COLUMN: Water velocity vectors
HILLS BUBBLE COLUMN: Predicted and measured Void fraction contours
HILLS BUBBLE COLUMN: Predicted and measured water velocity profile at z = 0.6m
HILLS BUBBLE COLUMN: Void fraction profiles at z = 0.6m