SPH modeling of the effect of crucible tipping rate on oxide formation

Prakash, Mahesh, Cleary, Paul W. and Taylor, John A. (2011). SPH modeling of the effect of crucible tipping rate on oxide formation. In: A. Prasad, J. A. Taylor and J. F. Grandfield, Aluminium Cast House Technology XII: Selected, peer reviewed papers from the 12th International Conference and Exhibition on Aluminium Cast House Technology. 12th International Conference and Exhibition on Aluminium Cast House Technology, Melbourne, Australia, (54-62). 11-14 September 2011. doi:10.4028/www.scientific.net/MSF.693.54

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Author Prakash, Mahesh
Cleary, Paul W.
Taylor, John A.
Title of paper SPH modeling of the effect of crucible tipping rate on oxide formation
Conference name 12th International Conference and Exhibition on Aluminium Cast House Technology
Conference location Melbourne, Australia
Conference dates 11-14 September 2011
Proceedings title Aluminium Cast House Technology XII: Selected, peer reviewed papers from the 12th International Conference and Exhibition on Aluminium Cast House Technology   Check publisher's open access policy
Journal name Materials Science Forum   Check publisher's open access policy
Place of Publication Stafa-Zurich, Switzerland
Publisher Trans Tech Publications
Publication Year 2011
Sub-type Fully published paper
DOI 10.4028/www.scientific.net/MSF.693.54
ISSN 0255-5476
Editor A. Prasad
J. A. Taylor
J. F. Grandfield
Volume 693
Start page 54
End page 62
Total pages 9
Collection year 2012
Language eng
Abstract/Summary 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).
Keyword Oxide formation
Crucible tipping rate
SPH
Flow modeling
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

 
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Created: Wed, 30 Nov 2011, 15:00:20 EST by Viviane Victoria Crosthwaite on behalf of Faculty Of Engineering, Architecture & Info Tech