study predicts erosion damage caused by solid particles impact on the inner surface of u-tube. Based on finite volume method, study uses numerical simulation of Lagrange method to discuss different inlet velocity (from 2.5 m/s to 5.5 m/s) of fluid and mass flow rate discrete phase which affect the location and ratio of erosion. The results show that: with other parameters of fluid fixed, the mean erosion rate on the pipe wall increases from 8.72x10~(-9)kg/m~2·s to 7.3x10~(-8)kg/m~2·s with a growth exponentially when the inlet velocity increases from 2.5m/s to 5.5m/s. With other parameters fixed, the facet average erosion rate increased from 1.85x10~(-8)kg/m~2·s to 8.68x10~(-8)kg/m~2·s with a liner growth. Moreover, the elbow of pipe appears obvious erosion phenomenon. Especially, due to centrifugal force, the erosion rate on lateral radius wall is significantly greater than the inner. The concentrated erosion region tends toward get wider as flow rate and mass flow rate of discrete phase increase.
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