This study investigates two different models (k_(s) - epsilon_(s) and k_(s) - k_(fs)) for the particle stress tensor for turbulent liquid-solid upward vertical flow using the two-fluid model. One of the models is based on a formulation similar to that of the liquid phase (k_(f) - epsilon_(f) model) while the other is based on the kinetic theory of granular flow. For the particle size (d_(p) velence 470 (mu)m) investigated, both models produced particle phase velocity and volume fraction profiles that compared well with measured data at a particle mean volume fraction of 8.7percent and mean mixture velocity of 3 ms~(-1). However, when the predicted turbulence kinetic energy and eddy viscosity values are compared, it is clear that the models produce different levels of turbulence. The mean data available does not allow for a critical assessment of the turbulence transport equations and particularly, the individual terms.
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