Measurement of particle interaction properties for the incorporation into Discrete Element Methods

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dc.contributor.advisorPowell, Malcolmen_ZA
dc.contributor.authorChandramohan, Rajiven_ZA
dc.date.accessioned2014-07-31T11:30:19Z
dc.date.available2014-07-31T11:30:19Z
dc.date.issued2005en_ZA
dc.descriptionIncludes bibliographical references (leaves 213-215).
dc.description.abstractThe principle aim of this research project is to measure parameters which are pertinent for numerical simulations in discontinuous media. One such numerical tool, the Discrete Element Method (DEM), is a promising technique for predicting the dynamics of charge motion with in a mill. Particle interactions in DEM are calculated by contact force and force displacement laws at each particle contact. These contact events are characterized by parameters that are often fitted or estimated due to the lack of accurate experimental measurements. The aim of this project is to experimentally measure the necessary interaction properties required for the DEM analysis and to test the DEM models against the measured experimental results. An in-flight binary collisions drop tester is constructed to measure the material interaction properties of two spheres. The collision event is captured photographically and pre- and post- relative velocities are measured. The binary collisions of the particles are carefully controlled by relay timing circuits and they are captured on digitized images using a SLR digital camera. The particles are illuminated using digital strobes controlled by a signal generator. The heights of the colliding particles are adjusted to vary the drop velocities prior to collision. The measured relative velocities arc applied in rigid body theory of binary impact to extract the required material interaction properties. The parameters measured from the binary collision include coefficients of tangential and normal restitution and friction. The analysis presented here draws on the work of Maw et al and Foerster et al, which is an extension of the Hertz theory of impact to the oblique impact of the elastic bodies with circular contacts. Initial numerical simulations using the viscous damping model is performed in Particle Flow Code (PFC) and a comparison between experimental and numerical results presented.en_ZA
dc.identifier.apacitationChandramohan, R. (2005). <i>Measurement of particle interaction properties for the incorporation into Discrete Element Methods</i>. (type). University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Mechanical Engineering. Retrieved from http://hdl.handle.net/11427/5565en_ZA
dc.identifier.chicagocitationChandramohan, Rajiv. <i>"Measurement of particle interaction properties for the incorporation into Discrete Element Methods."</i> type., University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Mechanical Engineering, 2005. http://hdl.handle.net/11427/5565en_ZA
dc.identifier.citationChandramohan, R. 2005. Measurement of particle interaction properties for the incorporation into Discrete Element Methods. type. University of Cape Town.en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Chandramohan, Rajiv AB - The principle aim of this research project is to measure parameters which are pertinent for numerical simulations in discontinuous media. One such numerical tool, the Discrete Element Method (DEM), is a promising technique for predicting the dynamics of charge motion with in a mill. Particle interactions in DEM are calculated by contact force and force displacement laws at each particle contact. These contact events are characterized by parameters that are often fitted or estimated due to the lack of accurate experimental measurements. The aim of this project is to experimentally measure the necessary interaction properties required for the DEM analysis and to test the DEM models against the measured experimental results. An in-flight binary collisions drop tester is constructed to measure the material interaction properties of two spheres. The collision event is captured photographically and pre- and post- relative velocities are measured. The binary collisions of the particles are carefully controlled by relay timing circuits and they are captured on digitized images using a SLR digital camera. The particles are illuminated using digital strobes controlled by a signal generator. The heights of the colliding particles are adjusted to vary the drop velocities prior to collision. The measured relative velocities arc applied in rigid body theory of binary impact to extract the required material interaction properties. The parameters measured from the binary collision include coefficients of tangential and normal restitution and friction. The analysis presented here draws on the work of Maw et al and Foerster et al, which is an extension of the Hertz theory of impact to the oblique impact of the elastic bodies with circular contacts. Initial numerical simulations using the viscous damping model is performed in Particle Flow Code (PFC) and a comparison between experimental and numerical results presented. DA - 2005 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 2005 T1 - Measurement of particle interaction properties for the incorporation into Discrete Element Methods TI - Measurement of particle interaction properties for the incorporation into Discrete Element Methods UR - http://hdl.handle.net/11427/5565 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/5565
dc.identifier.vancouvercitationChandramohan R. Measurement of particle interaction properties for the incorporation into Discrete Element Methods. [type]. University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Mechanical Engineering, 2005 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/5565en_ZA
dc.language.isoengen_ZA
dc.publisher.departmentDepartment of Mechanical Engineeringen_ZA
dc.publisher.facultyFaculty of Engineering and the Built Environment
dc.publisher.institutionUniversity of Cape Town
dc.titleMeasurement of particle interaction properties for the incorporation into Discrete Element Methodsen_ZA
dc.typeThesis
dc.type.qualificationlevelMSc
dc.type.qualificationnameThesisen_ZA
uct.type.filetypeText
uct.type.filetypeImage
uct.type.publicationResearchen_ZA
uct.type.resourcetypeen_ZA
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