Numerical prediction of solid particle erosion in angle-cutting elbows with gas–solid flow

Abstract

Angle-cutting elbows (ACEs) are important components of pipelines for fluid diversion and distribution. Severe erosion may occur on the internal walls of ACEs used to transport solid–gas/liquid flow. Erosion may cause pipeline failures. Therefore, the ACE erosion is a fundamental problem. However, the literature on the erosion characteristics and structural optimization of ACEs is rarely reported. This study conducts a numerical prediction of solid particle erosion in ACEs with gas–solid flow. Simulation models based on the two-way coupled Eulerian–Lagrangian approach and the E/CRC model are combined with particle-wall rebound models and a user defined function in the dispersed phase model. Simulation results are verified through a comparison with previously reported experimental results. The findings show that serious erosion occurs in the downstream part of the concave wall of ACE, whereas only slight erosion occurs on the convex wall of ACE. Therefore, anti-erosion measures should be adopted for the concave wall of ACEs. In addition, structural optimization of ACEs for erosion reduction is conducted. The optimal cutting angle is 40° > 50°, and the optimal non-dimensional cutting length is <1.05. The influence of fluid parameters on erosion characteristics is also determined. The erosion rate on the concave wall increases linearly with particle diameter and exponentially with inlet velocity.

A comprehensive analysis of the erosion in a carbon steel boiler tube elbow through the use of 3D mapping of the corroded surface and CFD modelling

“…The CFD simulations using the Euler-Lagrange and Euler-Euler-Lagrange approaches accurately predicted the observed maximum erosion rates, erosion locations, and erosion patterns for liquid-sand and dispersed-bubble-sand flows. A numerical study was conducted in [12], to estimate the erosion of solid particles in angle-cutting elbows (ACEs) where there is a flow of gas and solid particles. The simulation models used a combination of the two-way coupled Eulerian-Lagrangian approach and the E/CRC model, along with particle-wall rebound models and a userdefined function in the dispersed phase model.…”