Models with phase slip in the hydrodynamics of granular media

Abstract

Abstract Two-phase flows in granular media are widely used in the chemical and energy industries as they provide a high intensity of transfer processes. One of the key characteristics of such flows is the relationship between the pressure drop cross the granular layer and the mass velocity of the two-phase mixture. To date, no single approach has been developed to calculate the characteristics of such flows. In this paper, we compare three models constructed given the difference in the velocities of the liquid and vapor phases. All models are used to solve both the direct problem of calculating the pressure drop for a given mass velocity and the inverse problem of calculating the mass velocity for a known pressure drop. The accuracy of the models was compared using two sets of experimental data with a combined pressure variation range of 0.6–15 MPa, a flow quality of 0.002–0.3, a mass velocity of 120 – 1100 kg/m2s, ball particle diameters of 2–4 mm, and a packed bed height of 50-355 mm. The calculation with the new gas-dynamic model demonstrated the best result in the entire range of experimental data.