Thermal conductivity of carbon nanotube reinforced aluminum composites: A multi-scale study using object oriented finite element method |
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| Affiliation: | 1. Department of Mechanical and Materials Engineering, Florida International University, Miami, FL 33174, USA;2. Department of Metallurgical and Materials Engineering, Indian Institute of Technology, Roorkee, Roorkee 247667 Uttarakhand, INDIA;1. Department of Materials System Engineering, Pukyong National University, 365, Sinseon-ro, Nam-gu, Busan 48547, Republic of Korea;2. The International Science Technology Research Center, Pukyong National University, 365, Sinseon-ro, Nam-gu, Busan 48547, Republic of Korea;3. Department of Instrumental Analysis, Tohoku University, 6-6-11 Aramaki-aza Aoba, Aoba-ku, Sendai 980-8579, Japan;4. Department of Converged Technology Research, Gyeongbuk Hybrid Technology Institute, Goiyean-dong, Yeongcheon, Gyeongbuk 38899, Republic of Korea;5. Department of R&D, Next Generation Materials Co., Ltd., 365, Sinseon-ro, Nam-gu, Busan 48547, Republic of Korea;1. Department of Mechanical Engineering, Sree Buddha College of Engineering, Pattoor, Kerala 690528, India;2. Department of Metallurgical & Materials Engineering, National Institute of Technology, Tiruchirappalli 620015, India;1. Department of Mechanical and Aerospace Engineering, Monash University, Wellington Road, Clayton, Victoria 3800, Australia;2. CSIRO Earth Science & Resource Engineering, Clayton North, Victoria 3169, Australia;1. Department of Materials Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran;2. Faculty of New Sciences and Technologies, University of Tehran, 1439957131 Tehran, Iran |
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| Abstract: | In this study, object oriented finite element method (OOF) has been utilized to compute the thermal conductivity of plasma sprayed Al-12 wt.% Si containing 10 wt.% multiwall carbon nanotubes (CNTs). The computations have been made at micro- and macro-length scales which highlight the effect of CNT dispersion on thermal conductivity. Experimentally measured values at 50 °C indicate that CNT addition reduced the thermal conductivity of Al–Si matrix from 73 W m?1 K?1 to 25.4 W m?1 K?1 which is attributed to the presence of CNT clusters. OOF calculations at micro-length scale predicted an 81% increase in the conductivity of Al–Si matrix due to presence of well dispersed CNTs inside the matrix. At larger lengths scale, the decrease in the overall conductivity is related to the extremely low conductivity of CNT clusters. Thermal conductivity of CNT clusters could be up to three orders of magnitude lower than individual CNTs. OOF computed values match well with experimental results. OOF compute thermal conductivity of Al–CNT composite is also compared with theoretical two-phase models for CNT-composites at different length scales. |
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