Abstract
Fine and large particles flowing through a bend in a pipe move differently and therefore erode the pipe differently. This paper simulates solid–liquid two-phase flow containing large particles in a bend and analyses the relationship between the wear formation and particle motion. Wear experiments are carried out using 3-mm glass bead particles at a mass concentration of 1–15%. At the same time, the flow field and the motion of the granular system are obtained in computational fluid dynamics–discrete element method simulation. The wear formation mechanism is revealed by comparing experiments with numerical simulations. The wear rate of the wall surface increases with the mass concentration, while the marginal growth rate decreases as the mass concentration increases. As the mass concentration increases to a certain value, the degree of wear reaches a maximum and remains unchanged subsequently because of the formation of a particle barrier along the bend wall. The particles near the wall region will bounce forward because of the periodic disturbance flow around particles. The impact of mass bouncing particles causes the formation of the erosion ripple on the test sheet.
Highlights
Ore pipeline transportation is an inexpensive and highly efficient delivery method in large-scale mining operations
Peng et al [13] used a two-way coupled Euler – Lagrange method to solve the problem of liquid –solid flow through a bend and compared wear patterns obtained in experiments for a particle diameter of 450 mm
This paper investigates the effect of a solid –liquid mixture containing large particles with a diameter of 3 mm on the wearing of a wall by conducting wear experiments and computational fluid dynamics (CFD)-discrete element method (DEM) numerical simulation
Summary
Ore pipeline transportation is an inexpensive and highly efficient delivery method in large-scale mining operations. Peng et al [13] used a two-way coupled Euler – Lagrange method to solve the problem of liquid –solid flow through a bend and compared wear patterns obtained in experiments for a particle diameter of 450 mm. They illustrated the relationship between the Stokes number and the dynamic motion of the maximum erosion position and proposed three collision mechanisms that explain how the change in the Stokes number affects the erosion position. This paper investigates the effect of a solid –liquid mixture containing large particles with a diameter of 3 mm on the wearing of a wall by conducting wear experiments and CFD-DEM numerical simulation. Motor gear reducer water tank stirrer computer experimental section electromagnetic flowmeter
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