Research on Wear Characteristics of Combination Pipeline Based on CFD-DEM Method
Studying pipeline wear is crucial for ensuring the safety,economy,and sustainable operation of pipeline systems.This article presents a study on the wear characteristics of solid-liquid two-phase flow in a combination pipeline consisting of two 90° elbows,using the CFD-DEM research method for numerical simulation.The results show that when the particle volume concentration remains constant,the wear rate will increase exponentially with the increase of flow rate,and is directly proportional to the 2.41 power of collision velocity;As the particle concentration increases,there are different changes in the collision frequency and wear rate of the two elbows,and the"shield effect"is more likely to occur in the pipeline under high concentration conditions;The increase in elbow spacing makes the flow of particles more thor-ough,while weakening the influence of secondary flow inside the elbow,resulting in a decrease in the number of contacts between particles and the wall,as well as a decrease in collision frequency and wear rate;Under the same concentration of mixed particle size conditions,increase of particle size will lead to a decrease in the average wear rate of the elbow wall;While increase of the inertia force of large particles will result in increase of the maximum wear rate of the elbow wall.This research results provide theoretical support for improving the wear resistance performance of combination pipeline.
万方数据
维普
