Optimization of a convex pattern surface for sliding wear reduction based on a definitive screening design and discrete element method

Yunpeng Yan,Rudy Helmons,Craig Wheeler,Dingena Schott

doi:10.1016/j.powtec.2021.09.041

Yunpeng Yan, Rudy Helmons + Show 2 more

Open Access

https://doi.org/10.1016/j.powtec.2021.09.041

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Abstract

A previous study revealed that a convex pattern surface can reduce sliding wear of a transfer chute. A convex pattern surface is a flat surface outfitted with a pattern of convexes defined by five parameters. A three-level definitive screening design (DSD) method combined with discrete element method (DEM) is used to investigate the influence of the five parameters and two operational conditions on the sliding wear. Two flow regimes are distinguished, namely continuous and discontinuous flow regimes, and both flow regimes can significantly reduce the sliding wear. The particle velocity and angular velocity profiles verify the guiding and rolling effect of the convex pattern on the motion of particles. A regression model fitted based on the DSD indicates that three main factors and one interaction have significant influence on the sliding wear.

Highlights

Bulk solids handling plays a significant role in a range of industries, such as the mining, agricultural, chemical, and pharmacology industries [1]
This paper aims at optimizing a convex pattern surface for sliding wear reduction through the discrete element method (DEM)
To quantify the effect of the factors tested, a regression equation is fitted based on normalized wear results which are divided by the highest value of the wear volumes

Summary

Introduction

Bulk solids handling plays a significant role in a range of industries, such as the mining, agricultural, chemical, and pharmacology industries [1]. The process of transferring bulk solids, e.g. iron ore, leads to surface wear of handling equipment. Studies show that approximately 82% of the energy loss is attributed to the bulk material sliding along the chute bottom and 9% of the losses due to sliding against the side walls [4]. Severe wear has been found in several locations on bulk handling equipment, for example silo walls and transfer chute bottom sections [4,5]. Wear leads to surface deformation and volume loss of handling equipment and accelerates the damage of the equipment, resulting in a reduction of lifespan. To save costs and reduce downtime, the surface wear of bulk solids handling equipment must be reduced

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