We analyze thermal transport in three-dimensional (3D) nano-composites composed of carbon nanotube (CNT) dispersions to investigate percolation effects on the effective thermal conductivity of these composites. Thermal transport simulations for the randomly distributed nanotubes inside the host substrate are based on the diffusive Fourier conduction theory. The numerical model incorporates the effect of substrate-CNT conductivity ratio and the interfacial resistance due to tube-tube and tube-substrate contact, which are the most critical parameters governing thermal transport properties. Numerical predictions of effective thermal conductivity are in excellent agreement with the linear response theory and effective medium approximation (EMA) when assumptions of theory are incorporated in the model. The trends for the variation of effective thermal conductivity with increasing nanotube density are in broad agreement with previous experimental observations. Our numerical results also show that the onset of thermal percolation is gradual and largely dependent on the tube-to-substrate conductivity ratio and interfacial resistance at tube-tube and tube-substrate contact.
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ASME 2008 International Mechanical Engineering Congress and Exposition
October 31–November 6, 2008
Boston, Massachusetts, USA
Conference Sponsors:
- ASME
ISBN:
978-0-7918-4874-6
PROCEEDINGS PAPER
Percolation Effects on the Thermal Conductivity of 3D Nanotube Composites Available to Purchase
Muhammad A. Alam,
Muhammad A. Alam
Purdue University, West Lafayette, IN
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Jayathi Y. Murthy
Jayathi Y. Murthy
Purdue University, West Lafayette, IN
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Satish Kumar
IBM, Austin, TX
Muhammad A. Alam
Purdue University, West Lafayette, IN
Jayathi Y. Murthy
Purdue University, West Lafayette, IN
Paper No:
IMECE2008-69208, pp. 1291-1300; 10 pages
Published Online:
August 26, 2009
Citation
Kumar, S, Alam, MA, & Murthy, JY. "Percolation Effects on the Thermal Conductivity of 3D Nanotube Composites." Proceedings of the ASME 2008 International Mechanical Engineering Congress and Exposition. Volume 13: Nano-Manufacturing Technology; and Micro and Nano Systems, Parts A and B. Boston, Massachusetts, USA. October 31–November 6, 2008. pp. 1291-1300. ASME. https://doi.org/10.1115/IMECE2008-69208
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