CIESC Journal ›› 2019, Vol. 70 ›› Issue (2): 487-495.doi: 10.11949/j.issn.0438-1157.20181220

• Process system engineering • Previous Articles     Next Articles

Generality of CFD-PBM coupled model for simulations of gas-liquid bubble column

Huahai ZHANG(),Tiefeng WANG()   

  1. Department of Chemical Engineering, Tsinghua University, Beijing 100084, China
  • Received:2018-10-17 Revised:2018-12-16 Online:2019-02-05 Published:2019-04-03
  • Contact: Tiefeng WANG;


The generality of the CFD-PBM coupled model was studied by comparing the simulation results with experimental data under different operating pressures and liquid properties. The results show that the CFD-PBM coupled model with the modified pressure factor obtained from the internal-flow bubble breakup model can well predict the influence trend of pressure on the hydrodynamics of bubble column. The gas holdup increases significantly with increasing pressure. In addition, the simulation results for different liquid viscosity and surface tension are consistent with the experimental results. With increasing liquid viscosity, the bubble breakup rate decreases, which leads to a wider bubble size distribution, lower drag correction factor and decreased gas holdup. As the surface tension decreases, the bubble breakup rate increases, which results in smaller bubbles and higher gas holdup. The CFD-PBM coupling model has good versatility because it considers the effects of pressure, liquid viscosity and surface tension on bubble coalescence, fracture and gas-liquid interaction.

Key words: bubble column, CFD-PBM coupled model, operating pressure, physical properties, gas holdup

CLC Number: 

  • TQ 021.1


Schematic diagram of CFD-PBM model"

Table 1

Governing equations of two-fluid model"

质量守恒方程??(ραu)i=0, i = g, l
动量守恒方程??(ραuu)i=-αi?P'+??αμeff(?u+?uT)i+Fi,j+(ρα)ig, i = g, l



















Table 2

Models of bubble breakup and coalescence"



















Table 3

Properties of different liquids"



Comparison of simulated and experimental average gas holdup at different operating pressures[22]"


Mechanism of pressure effect"


Comparison of calculated and experimental average gas holdup at different liquid viscosities"


Calculated bubble size distributions at different liquid viscosities"


Calculated drag correction coefficient at different liquid viscosities"


Mechanism of effect of liquid viscosity"


Comparison of calculated and experimental average gas holdup at different liquid surface tension"


Mechanism of effect of liquid surface tension"


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