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dc.contributor.author Kekana, J
dc.contributor.author Siyakatshana, Njabulo
dc.contributor.author Wessels, G
dc.contributor.author Ubbink, O
dc.date.accessioned 2014-08-27T12:39:06Z
dc.date.available 2014-08-27T12:39:06Z
dc.date.issued 2011-01
dc.identifier.citation Kekana, J, Siyakatshana, N, Wessels, G and Ubbink, O. 2011. CFD simulation of thermodynamic and temperature effects on spontaneous combustion of coal stockpiles and dumps. In: 2nd African Conference on Computational Mechanics (AfriCOMP11), University of Cape Town, Cape Town, 5-8 January 2011 en_US
dc.identifier.uri http://hdl.handle.net/10204/7643
dc.description 2nd African Conference on Computational Mechanics (AfriCOMP11), University of Cape Town, Cape Town, 5-8 January 2011 en_US
dc.description.abstract In this work the development of a numerical model capable of identifying suitable conditions responsible for spontaneous combustion of coal storage piles and carbonaceous waste dumps are presented. The developed model captured the mass, momentum and energy conservation equations through the porous media. Combustion processes under consideration included physical absorption and desorption of atmospheric species in the coal matrix, formation of coal-oxygen complexes and oxygenated carbon species through chemisorption as well as the formation of both CO2 and CO through coal oxygenation. The aim of this model was to predict the influence of parameters such as buoyancy driven flows, temperature, storage pile porosity and permeability distributions as well as storage pile geometrical dimensions on combustion characteristics of carbonaceous materials. Possible analysis of such a model is constructed from the basis of a volume averaged methodology instead of deriving governing equations on a pore scale since this has proven to be the best options both from the time and physical dimensions perspectives. In all the cases strong non-linear interactions between the mass, momentum, and energy balance equations complicated the solution attainment through numerical integration of stiff partial differential equations (PDE’s).The simulation results obtained from the twodimensional model provided useful information in characterising the thermal-flow and combustion properties of coal stockpiles and carbonaceous materials and as such proved to be beneficial in assessing the stability of the stockpiles and quantifying the amount of CO2 emitted during combustion. The qualitative correctness of the model was validated by comparing the predicted results with other available numerical data obtained from the literature. Good correlations between the predicted and numerical results were obtained. en_US
dc.language.iso en en_US
dc.relation.ispartofseries Workflow;7301
dc.subject Spontaneous combustion en_US
dc.subject Coal stockpiles en_US
dc.subject Carbonaceous waste dumps en_US
dc.subject Stiff PDE’s en_US
dc.subject CFD modelling en_US
dc.subject Volume averaged methodology en_US
dc.subject Volume averaged desorption en_US
dc.subject Volume averaged chemisorptions en_US
dc.title CFD simulation of thermodynamic and temperature effects on spontaneous combustion of coal stockpiles and dumps en_US
dc.type Presentation en_US


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