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• W317697718 abstract "Discrete element modelling is gradually becoming more popular as a validation tool by industry to simulate bulk flow in bulk material handling and processing equipment. Although discrete element method (DEM) is a popular numerical method in academia to model the complex interactions in particle systems, the demand for the application of DEM to industrial problems is high. The use of DEM simulations to evaluate the flow of bulk materials through belt conveyor transfer points is popular to assist designers to trouble-shoot and quantify the functionality of a design. DEM does not directly design bulk material handling and processing equipment or replace design know-how but DEM simulation is an alternative approach to model particle flow that has traditionally been analysed using analytical methods, empirical design rules and scale model physical prototyping. Calibrated DEM simulations provide additional confidence of the performance of equipment andimprove the efficiency and life of equipment due to the significant amounts of quantitative data available to provide insight into the complex physical interactions that occur. Recently there has been a growth of available commercial DEM programs such as EDEM®, which has been utilised in this study, but calibration and validation of DEM simulations still requires further investigation to adequately characterise and model cohesionless and cohesive bulk materials with realism. Insufficient calibration of DEM models can lead to unrealistic predictions making DEM a misleading design validation tool and may lead to poor performing equipment that can be costly to repair. The purpose of this research was to develop techniques to calibrate DEM models based on physical bench scale tests which reproduce the bulk flow behaviours to be modelled on a larger industrial scale. Cohesionless and cohesive bulk materials including polyethylene pellets, coal andbauxite were examined to characterise and develop a set of realistic particle-to-particle and particle-to-boundary interaction parameters for DEM simulations. The accuracy of the characterisation and calibration procedures were examined by modelling the impingement of polyethylene pellets against a flat impact plate using a novel conveyor transfer research facility where experimental quantitative and qualitative data was compared against the DEM simulations and analytical methods. Additional to the latter experimental test program, DEM simulations were conducted on a large scale industrial transfer point to model the flow of wet and sticky bauxite where results from the DEM models were evaluated against the limited quantitative information measured and observations from an existing transfer station. The aim of this thesis was to provide industry with some validated techniques to develop a calibrated DEM model to simulate the flow of bulkmaterials through complex transfer points and examine the accuracy of the predictions and limitations of DEM. It has been found that some DEM parameters are sensitive,…" @default.
• W317697718 created "2016-06-24" @default.
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• W317697718 date "2011-01-01" @default.
• W317697718 modified "2023-09-23" @default.
• W317697718 title "Quantifying and modelling mechanisms of flow in cohesionless and cohesive granular materials" @default.
• W317697718 hasPublicationYear "2011" @default.
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