Abstract—In this study, a new model of predicting effective thermal conductivity for Al2O3 nanoparticles dispersed in ethylene glycol (EG) and water regarding the shape factor and volume fraction of nanoparticles, is developed. It has been proved that considering Al2O3 particles as spherical molecules is not acceptable assumption. Starting from Brailsford and Major general equation for multi-component materials, an equation has been derived that is based on shape factor of nanoparticle. Also, the according to morphology of Al2O3, a new shape factor for these nanoparticles witch is more realistic, is given which TEM images confirm this. Finally, theoretical results have been compared with experimental data. It is shown that shape factor value applied for Al2O3 / Water system cannot be used for Al2O3/ EG system and EG molecules cover Al2O3 nanoparticles differently that must be considered in equations.
Index Terms—Shape factor, Effective Thermal Conductivity, Al2O3 nanoparticle, suspensions.
1-Faculty of Chemical and Natural Resources, Universiti Teknologi Malaysia, Johor Bahru, 81310 Johor, Malaysia
2-Department of Chemical Engineering, Faculty of Engineering, Arak University, Iran
* hhadi2@live.utm.my
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Cite: Hadi Hezaveh, Mostaf Keshavarz Moraveji, "Modeling Effective Thermal Conductivity of Al2O3 Nanoparticles in Water and Ethylene Glycol Based on Shape Factor," International Journal of Chemical Engineering and Applications vol. 2, no. 1, pp. 1-4, 2011.
