Erosion caused by solid particles is usually one of the most important causes of
damage to equipment and pipelines. Many industrial processes that require fluid
transfer are directly exposed to leakage or contamination problems. As a result,
unnecessary costs are required for the maintenance of these equipments. This
industrial concern has led many researchers to develop analytical tools that can
quantify erosion. Due to this fact, to validate the CFD model, the numerical
results for the standard elbow are compared with the experimental data. After that,
the inner ring and rifling were added to the standard elbow, which had the same
geometrical characteristics of the standard elbow (such as the diameter and radius
of curvature) as well as the simulation parameters (for example, the initial
velocity, density, viscosity, etc.) without any changes. In fact, the main goal of
this study is to investigate the effect of these two modified geometries on the
reduction of elbow erosion. In the present study, numerical modeling of erosion in
elbows for gas-solid two-phase flow based on one-way coupling has been done
using Eulerian-Lagrangian approach. RNG ��-�� turbulence model is used to solve
the flow. For erosion modeling, Oka et al.'s model is used, and for particle-wall
collision modeling, Grant and Tabakov's model is used. The results of two
geometries of inner ring and rifling were compared with standard elbow and
analyzed. Finally, to select the optimal geometric model, two important criteria of
maximum erosion and integral of the erosion surface have been taken into
consideration. The remarkable result is that adding the inner ring to the standard
esbow reduces the maximum erosion and also reduces the integral of the erosion
surface along the elbow wall. Among the internal rings models, the elbow with
two rings has resulted in the highest amount of erosion reduction by 43%. Based
on the integral criterion of the erosion surface, elbow with five internal rings