Impacts of Particle Properties on Gas Holdup under Four Flow Regimes in Three-Phase Bubble Columns

The impacts of the solid volume fraction V-s and particle size d(p) on the total and local gas holdups in gas-liquid-solid bubble columns under different flow regimes were investigated. The flow regimes discussed were the discrete bubble regime (DBR), transition regime (TR), bubble coalescence regime (BCR), and strong turbulent regime (STR). The results demonstrated that the bed average gas holdup epsilon(g) decreased with higher solid volume fraction in DBR, TR, and BCR. The increment of the solid volume fraction promoted bubble coalescence and also can enhance the particle effect on the average gas holdup. The epsilon(g) changed slightly when shifting the V-s or d(p) in STR. A new correlation for epsilon(g) was developed considering the particle properties and the flow regimes studied.

Automated summary

The study investigated the effects of solid volume fraction and particle size on gas holdups in gas-liquid-solid bubble columns under different flow regimes. Results showed that gas holdup decreased with higher solid volume fraction in certain flow regimes, while the change in solid volume fraction or particle size had a minor impact in the strong turbulent regime. A new correlation for gas holdup was developed considering particle properties and flow regimes.