Local drag laws in dispersed two-phase flow

The ability to predict the interfacial drag between phases of considerable importance for analyzing a dispersed two-phased system undertransient conditions. Constitutive relations are developed for the drag force for bubbly, droplet, and particulate flows by a unified method. Simple drag similarity criteria and a mixture viscosity model are introduced in the analysis. The present drag correlation cover all concentration ranges and wide Reynolds number ranges, from the Strokes regime up to the Newton's regime or the churn-turbulent-flow regime.