The MIIS Eprints Archive: No conditions. Results ordered -Date Deposited. 2021-08-05T15:43:13ZEPrintshttp://miis.maths.ox.ac.uk/images/sitelogo.gifhttp://miis.maths.ox.ac.uk/miis/2011-12-09T17:22:32Z2015-05-29T20:04:56Zhttp://miis.maths.ox.ac.uk/miis/id/eprint/464This item is in the repository with the URL: http://miis.maths.ox.ac.uk/miis/id/eprint/4642011-12-09T17:22:32ZStratification in steelmaking ladlesThe problem of temperature stratification in a steelmaking ladle is considered. There are three distinct zones in the flow, the wall boundary layer, the bottom stagnation zone and the central plug flow. Typical length, velocity and time scales are determined for the flow and compared to numerical simulations. A model of the wall boundary layer using similarity solution techniques is detailed. Models for the temperature stratification in the bottom stagnation zone and the plug flow are included. Recommendations for reducing the temperature stratification in the ladle and improvements to their numerical simulation are made.R. Weber2011-12-09T17:19:38Z2015-05-29T20:04:53Zhttp://miis.maths.ox.ac.uk/miis/id/eprint/463This item is in the repository with the URL: http://miis.maths.ox.ac.uk/miis/id/eprint/4632011-12-09T17:19:38ZOptimised dragline planning modelThe presenting company provided data for typical operating parameters used in dragline operation. The problem for the Study Group was to investigate whether an optimal model of dragline operation could be developed. The Study Group modelled the sequence of operations for a typical surface mining strip. Overall, a simulation approach seems necessary to fully represent the dragline operation. Some aspects of the operations that are amenable to optimisation are described in this report.D. Sier2011-12-09T17:16:46Z2015-05-29T20:04:50Zhttp://miis.maths.ox.ac.uk/miis/id/eprint/462This item is in the repository with the URL: http://miis.maths.ox.ac.uk/miis/id/eprint/4622011-12-09T17:16:46ZOil Blending: Mixing and ContaminationThe Shell Company of Australia has a frequent need to blend lubricants. Blending, sometimes involving three lubricant oils and additives, takes place by jet mixing in large tanks of typically 45,000 titres capacity. The jets are driven by pumps with typical volume throughput of up to 1,000 titres per minute, and typical blending times may be as long as one or two hours.

The jet blending process was investigated in a number of ways at the Study Group. These included: simple estimates for blending times, theoretical and experimental description of jet behaviour, development of a simple compartment model for the blending process, and several large scale computer simulations of the jet-induced motion using a commercial Computational Fluid Dynamics package. In addition, the sedimentation of contaminant particles in the tanks was investigated. This overall investigation, using a variety of approaches, gave a good knowledge of the blending process.N. BartonS. SpencerZ. Zhu2011-12-09T17:12:43Z2015-05-29T20:04:46Zhttp://miis.maths.ox.ac.uk/miis/id/eprint/461This item is in the repository with the URL: http://miis.maths.ox.ac.uk/miis/id/eprint/4612011-12-09T17:12:43ZDragline comparisonsThe presenting company provided data on the performance of a dragline over a four-week period during which four different buckets were used. The Study Group examined this data and suggested a method of analysing data from such comparative studies.G. Robinson2011-12-09T17:10:16Z2015-05-29T20:04:43Zhttp://miis.maths.ox.ac.uk/miis/id/eprint/460This item is in the repository with the URL: http://miis.maths.ox.ac.uk/miis/id/eprint/4602011-12-09T17:10:16ZDesign and loading of dragline bucketsDraglines are an expensive and essential part of open cut coal mining. Small improvements in performance can produce substantial savings. The design of the bucket and the way in which it fills with overburden are very important to the overall dragline performance. Here we use a numerical model to simulate this filling process and to differentiate between the flow patterns of two different buckets. Extensions to the model are explored.P. Cleary