Full Text Available
Note: Clicking the button above will open the full text document at the original institutional repository in a new window.
An investigation into the parameters effecting the performance of tube mills : the behaviour of a single particle on the inside of a rotating cylinder
This thesis is the first stage of a project to investigate the parameters effecting the performance of tube mills. The main topics that the project will cover are the motion of mill charge and the wear characteristics of the balls and the mill liners. A literature survey highlighted that no examinat...
Saved in:
| Main Author: | |
|---|---|
| Other Authors: | |
| Format: | Thesis |
| Language: | English |
| Published: |
Department of Mechanical Engineering
2016
|
| Subjects: | |
| Tags: |
No Tags, Be the first to tag this record!
|
| _version_ | 1867614028794167296 |
|---|---|
| access_status_str | Open Access |
| author | Nates, M B |
| author2 | Nurick, Gerald N |
| author_browse | Nates, M B Nurick, Gerald N |
| author_facet | Nurick, Gerald N Nates, M B |
| author_sort | Nates, M B |
| collection | Thesis |
| description | This thesis is the first stage of a project to investigate the parameters effecting the performance of tube mills. The main topics that the project will cover are the motion of mill charge and the wear characteristics of the balls and the mill liners. A literature survey highlighted that no examination had been performed that investigated the motion of a particle with specific emphasis on the response to changes in the coefficient of friction between the particle and the liner. This thesis concentrates on the motion of a single particle moving on the inside of a smooth rotating cylinder. Three formulations are presented that model the motion of the particle. The first model assumes that the particle slides along the cylinder. To ensure that it slides, and does not roll, a block shaped particle is modelled. The second motion type assumes that a spherical shaped particle rolls along the cylinder. The assumption that is made, is that the point of contact between the ball and the cylinder does not slip or skid. This mode of rolling has been defined as Pure Rolling. A third model is proposed that is a combination of the sliding and rolling models. The formulation attempts to incorporate both actions, rolling and sliding. In this way the motion of the particle.is dependent on both the rolling and sliding interactions. The governing equations for the Sliding and Rolling models are solved numerically, using an Euler Forward Approximation. Both models are solved by a computer implementation of the resulting numerical equations. The Sliding program has been extended to animate the response of the block on the inside of the cylinder. The theoretical predictions from the two numerical solutions are presented and discussed. |
| format | Thesis |
| id | oai:open.uct.ac.za:11427/18799 |
| institution | University of Cape Town (South Africa) |
| language | eng |
| last_indexed | 2026-06-10T12:45:32.221Z |
| license_str | Not specified — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UCTD — University of Cape Town Open Access Repository |
| publishDate | 2016 |
| publishDateRange | 2016 |
| publishDateSort | 2016 |
| publisher | Department of Mechanical Engineering |
| publisherStr | Department of Mechanical Engineering |
| record_format | dspace |
| source_str | UCTD — University of Cape Town Open Access Repository |
| spelling | oai:open.uct.ac.za:11427/18799 An investigation into the parameters effecting the performance of tube mills : the behaviour of a single particle on the inside of a rotating cylinder Nates, M B Nurick, Gerald N Mechanical Engineering Ball mills - Testing This thesis is the first stage of a project to investigate the parameters effecting the performance of tube mills. The main topics that the project will cover are the motion of mill charge and the wear characteristics of the balls and the mill liners. A literature survey highlighted that no examination had been performed that investigated the motion of a particle with specific emphasis on the response to changes in the coefficient of friction between the particle and the liner. This thesis concentrates on the motion of a single particle moving on the inside of a smooth rotating cylinder. Three formulations are presented that model the motion of the particle. The first model assumes that the particle slides along the cylinder. To ensure that it slides, and does not roll, a block shaped particle is modelled. The second motion type assumes that a spherical shaped particle rolls along the cylinder. The assumption that is made, is that the point of contact between the ball and the cylinder does not slip or skid. This mode of rolling has been defined as Pure Rolling. A third model is proposed that is a combination of the sliding and rolling models. The formulation attempts to incorporate both actions, rolling and sliding. In this way the motion of the particle.is dependent on both the rolling and sliding interactions. The governing equations for the Sliding and Rolling models are solved numerically, using an Euler Forward Approximation. Both models are solved by a computer implementation of the resulting numerical equations. The Sliding program has been extended to animate the response of the block on the inside of the cylinder. The theoretical predictions from the two numerical solutions are presented and discussed. 2016-04-12T09:36:32Z 2016-04-12T09:36:32Z 1989 Master Thesis Masters MSc (Eng) http://hdl.handle.net/11427/18799 eng application/pdf Department of Mechanical Engineering Faculty of Engineering and the Built Environment University of Cape Town |
| spellingShingle | Mechanical Engineering Ball mills - Testing Nates, M B An investigation into the parameters effecting the performance of tube mills : the behaviour of a single particle on the inside of a rotating cylinder |
| thesis_degree_str | Master's |
| title | An investigation into the parameters effecting the performance of tube mills : the behaviour of a single particle on the inside of a rotating cylinder |
| title_full | An investigation into the parameters effecting the performance of tube mills : the behaviour of a single particle on the inside of a rotating cylinder |
| title_fullStr | An investigation into the parameters effecting the performance of tube mills : the behaviour of a single particle on the inside of a rotating cylinder |
| title_full_unstemmed | An investigation into the parameters effecting the performance of tube mills : the behaviour of a single particle on the inside of a rotating cylinder |
| title_short | An investigation into the parameters effecting the performance of tube mills : the behaviour of a single particle on the inside of a rotating cylinder |
| title_sort | investigation into the parameters effecting the performance of tube mills the behaviour of a single particle on the inside of a rotating cylinder |
| topic | Mechanical Engineering Ball mills - Testing |
| url | http://hdl.handle.net/11427/18799 |
| work_keys_str_mv | AT natesmb aninvestigationintotheparameterseffectingtheperformanceoftubemillsthebehaviourofasingleparticleontheinsideofarotatingcylinder AT natesmb investigationintotheparameterseffectingtheperformanceoftubemillsthebehaviourofasingleparticleontheinsideofarotatingcylinder |