Papers by Keyword: Flow Modeling

Abstract: The situation and needs of data flow in upstream production information system were introduced, and then UML on the basis of knowledge and VP-UML on the basic functions were discussed. An example was given about how to use VP-UML to model effectively in data flow of exploration and production.

Abstract: Producing low-dross ingots has been a long-term goal in aluminium cast houses. The patented CASTfill technology [1] is a low-dross and high-productivity pouring system developed to fulfil this demand. This paper describes the research methods used during the development of CASTfill; now in service at Boyne Smelters Limited (BSL) since August 2009. The importance of combining scientific modelling and testing procedures with process operability, maintainability and durability to ensure the success of new technology in a production facility is also highlighted. Ingot assessments showed that the latest CASTfill design greatly reduced dross generated during mould filling. Improved ingot packaging and reduced variation of ingot weights were also observed as the results of a more tranquil flow of molten aluminium through CASTfill and its uniquely modular design.

Abstract: When hot molten aluminium is poured into a furnace from crucibles, oxide is generated due to the interaction of the liquid metal with the surrounding air. The amount of oxide produced is a function of several factors including the rate at which the crucible is tilted, the height of the crucible in relation to the furnace position and the location of the pivot of rotation. In this paper we evaluate the effect of crucible tilting rate on oxide formation for an industrial scale crucible and furnace setup. The mesh free Smoothed Particle Hydrodynamics (SPH) method is used for modelling the metal flow and oxide prediction. The model predicts rapid oxidation rates during periods of energetic fluid motion on freshly exposed metal surface and lower oxidation rates as oxide thickness increases. Four crucible rotation rates typical of normal operating conditions in a smelter are evaluated. The simulations showed that oxide generated due to fresh free surface created from a falling stream makes only a limited contribution to the overall oxide generated for the time scales of interest in this study. The secondary flows observed in the furnace make a significant contribution to the overall oxide generated. The rate of oxidation decreases and eventually ceases at a sufficiently long time when there is no disruption to the protective oxide skin. There is a 75% increase in oxide generated for the highest tilt rate (crucible emptied in 40 s) compared with the lowest tilt rate (emptied in 2.0 min).