FILM-THICKNESS, PRESSURE-GRADIENT, AND TURBULENT VELOCITY PROFILES INANNULAR DISPERSED FLOWS

A regional model has been described for dispersed turbulent two-phase flow which accounts for the transverse variation of velocity. The two- phase turbulence parameters are introduced in direct analogy to well-k nown single-phase flow parameters which are then correlated to experim ental data. The advantages of this approach are its simplicity and the absence of arbitrary parameters which need calibration at different e xperimental ranges. Its generality has been tested by comparisons at h igh and low operating pressures with air-water and steam-water mixture s. Comparisons between calculated and measured values have been carrie d out for the film thickness and the pressure gradient at different ex perimental setups.