Prediction of Thermal Conductivity Effects on in-situ Combustion Experiments

In this work a mathematical model for a combustion tube was developed. The model takes into account: (a) the heat transfer ahead and behind the combustion front, (b) the combustion zone thickness, (c) the heat generated and lost in the combustion front, and (d) the variation of thermal conductivity...

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Bibliographic Details
Published in:Petroleum science and technology 2010-01, Vol.27 (14), p.1637-1651
Main Authors: Cazarez-Candia, O., Centeno-Reyes, C.
Format: Article
Language:English
Subjects:
Applied sciences
Combustion
combustion tube
Crude oil
Crude oil, natural gas and petroleum products
Energy
Energy. Thermal use of fuels
Exact sciences and technology
Fuels
Heat transfer
in-situ combustion
Mathematical models
Petroleum products, gas and fuels. Motor fuels, lubricants and asphalts
Porosity
Processing of crude oil and oils from shales and tar sands. Processes. Equipment. Refinery and treatment units
Temperature profiles
Theoretical studies. Data and constants. Metering
Thermal conductivity
Tubes
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Summary:In this work a mathematical model for a combustion tube was developed. The model takes into account: (a) the heat transfer ahead and behind the combustion front, (b) the combustion zone thickness, (c) the heat generated and lost in the combustion front, and (d) the variation of thermal conductivity with temperature. The predicted combustion front temperature and temperature profiles are in good agreement with experimental data for heavy oils reported in literature. After validation of the mathematical model, further investigations of the effects of thermal conductivity on the temperature profiles ahead and behind the combustion front were studied. Expressions proposed in literature for effective thermal conductivity were used. It was found that: (a) when the functionality of thermal conductivity with temperature is taken into account, the predicted lost heat is different from that using constant thermal conductivity and (b) temperature profiles are affected principally at the beginning and at the end of the tube. The porosity effects on temperature profiles were also studied. In this case, the temperature profiles ahead and behind the combustion front and the combustion front temperature are smaller as the porosity becomes smaller.
ISSN:1091-6466
1532-2459
DOI:10.1080/10916460802608958