This paper deals with the prediction of erosion wear rate in slurry pump casings, with an emphasis on the comparison of two-dimensional and three-dimensional results. The two-dimensional analysis is carried out in the mid-plane of the pump normal to the pump axis. The dense solid-liquid flow field in the pump casing is modeled using an Eulerian-Eulerian model with a penalized finite element formulation to discretize the continuum equations. Erosion wear due to particle impact and sliding abrasion depends on the local velocity, shear stress, concentration of the particles and the empirically determined (particle-size dependent) wear rate coefficients used to relate the erosion wear to the local flow field properties.
The wear rate predictions from the 2D and 3D codes are compared to analyze the three dimensional flow effects on the wear rate. Operating conditions under which the 2D solution departs significantly from the 3D solution are explored with the aim of determining the limitations of the 2D simulations. Three pumps with different casing width-to-depth ratio are analyzed. Flow conditions and the pump casing width-to-depth ratio affect the differences between the 2D and 3D casing wear predictions.