TITLE : MODELLING OF TURBULENT TWO-PHASE BUBBLY AIR-WATER UPFLOW IN A VERTICAL PIPE

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

FOR : Rhone Poulenc Industrialisation, France

DETAILS :

• Two-Dimensional Turbulent Two-Phase Bubbly Air-Water Flow.
• Cylindrical-polar computational grid.
• Interphase momentum transfer accounts for drag, virtual mass, lift and interfacial pressure forces.
• Turbulence represented via the k-e turbulence model.
• Parabolic option is used and the calculation is terminated at the measuring station which is located 35 diameters downstream.

  NOTES :

• These flows have been studied experimentally by both Seriwaza et al [1992] and Lahey et al [1992].
• Reynolds number based on superficial liquid velocity is 80,000 for the Seriwaza experiments and 50,000 for the Lahey experiments.
• The inlet superficial gas and liquid velocities are 0.077 and 1.36 m/s for Seriwaza, and 0.1 and 1.08 m/s for Lahey.
• For the Lahey experiments the measured pressure drop was 9.3kN/m**3 which may be compared with the predicted value of 9.5 kN/m**3.
• Both prediction and experiment show bubble migration towards the wall as a consequence of interfacial lift forces.

PICTURES :

1. Seriwaza pipe flow: liquid axial velocity profiles at z/d=35. 2. Seriwaza pipe flow: void fraction profiles at z/d=35. 3. Lahey pipe flow: liquid axial velocity profiles at z/d=35. 4. Lahey pipe flow: void fraction profiles at z/d=35.

SERIWAZA PIPE UPFLOW: Water axial velocity profiles at z/d = 35
SERIWAZA PIPE UPFLOW: Void fraction profiles at z/d = 35
LAHEY PIPE UPFLOW: Water axial velocity profiles at z/d = 35
SERIWAZA PIPE UPFLOW: Void fraction profiles at z/d = 35