Gas holdup in homogeneous and heterogeneous gas-liquid bubble column reactors

The velocity-holdup relationship is the most important design parameter for gas-liquid bubble column reactors, providing the basis for the prediction of heat and mass transfer coefficients and information on hydrodynamic cond itions. A summary of the literature on gas holdup in bubble columns is supp lemented by new experimental results which extend the data range. A criteri on for the gas velocity leading to the transition between homogeneous and h eterogeneous regimes for perforated plate gas distributors has been develop ed. Correlations for gas holdup in both regimes are developed and verified against both new and existing data.