DISPERSE PHASE STRESS IN 2-PHASE FLOW

The usual two-fluid models for disperse two-phase flows feature an ave rage disperse-phase stress in the disperse-phase momentum equation. It is shown that it is possible to derive an expression for this quantit y without considering the detailed nature of the constitutive relation of the disperse phase. The result, which is more general than other r elations of the same nature, is illustrated with a number of examples. It is also shown that a new formulation of the averaged equations rec ently proposed by the authors is equivalent to the more usual one.