화학공학소재연구정보센터
Powder Technology, Vol.373, 118-141, 2020
Study of particle mass loading effects on sand erosion in a series of fittings
Sand erosion occurs in a host of industrial applications and accounts for one of the key factors in equipment failure. This study investigated sand panicle erosion performance of different 90-degree fittings. To this end, a CFDDEM model was employed and the erosion rates of various fittings carrying particle-laden flows were analyzed. Several cases with different mass loadings were simulated using different coupling models and the erosion-related parameters including erosion rate, particle impact angle, impact velocity and frequency were evaluated. The simulation results at high mass loading showed that the four-way coupling predicts much higher erosion along the bend in the elbows compared with one- and two-way coupling models. In sharp bends and plugged tees, however, the four-way coupling model predicts the lowest erosion due to the cushioning effects generated by the incoming high speed particle collisions with the high concentration of low speed particles near the walls. Therefore, at high and moderate mass loadings the four-way coupling model must be used. Furthermore, it was determined that the plugged tee is the most erosion-resistant bend geometry, due to the cushioning effect and low frequency of particle impingements on the end region. (C) 2020 Elsevier B.V. All rights reserved.