In gas-liquid flow

slug flow can be related to other flow patterns

if the hydrodynamic model is developed from slug flow

models of different flow patterns can be unified.Momentum and continuity equations were developed based on slug flow

and simulation of bubble and droplet entrainment was optimized.For the important parameters(wall and interfacial friction factors

slug translational velocity and average slug length)

the correlations of these parameters were optimized.Meanwhile

occurrence conditions and correlations of related parameters for liquid droplets and gas bubbles entrainment were given.Finally

a unified model based on slug flow for gas-liquid flow was developed.Experimental data from different sources were used to verify the model.The data with various flow patterns were taken from China University of Petroleum(East China)

Daqing Oilfield and foreign researchers.The accuracy of this model was higher than the original model without improvement and optimization of correlations.The relative errors of most pressure drop and holdup data calculated with this model were within ±15%.