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Effect of temperature on the effective thermal conductivity of n-tetradecane-based nanofluids containing copper nanoparticles
Institution:1. Centre for Mechanical Technology and Automation (TEMA–UA), Department of Mechanical Engineering, University of Aveiro, Aveiro, Portugal;2. Department of Mechanical Engineering, Institute of Technology, University of Gondar, Gondar, Ethiopia;3. Department of Sustainable and Renewable Energy Engineering, University of Sharjah, United Arab Emirates;4. Department of Physics – School of Engineering and Technology (SOET), Central University of Haryana (CUH), Mahendergarh 123031, Haryana, India;5. Electrical Engineering Section, Engineering Department, Center for DNA Fingerprinting and Diagnostics (CDFD), Department of Biotechnology, MoS&T, Hyderabad, India;1. Science and Technology on Plasma Physics Laboratory, Research Center of Laser Fusion, China Academy of Engineering Physics (CAEP), Mianyang 621900, PR China;2. Institute of Chemical Materials, China Academy of Engineering Physics (CAEP), Mianyang 621900, PR China;1. Department of Engineering Systems and Management (ESM), Masdar Institute of Science and Technology, Abu Dhabi, United Arab Emirates;2. Department of Mechanical Engineering, Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia;3. Centre of Research Excellence in Renewable Energy (CoRE-RE), King Fahd University of Petroleum and Minerals (KFUPM), Dhahran 31261, Saudi Arabia;4. Department of Energy Systems Engineering, Faculty of Engineering, Yasar University, 35100 Bornova, Izmir, Turkey;5. UM Power Energy Dedicated Advanced Centre (UMPEDAC), Level 4, Wisma R&D, University of Malaya, 50603 Kuala Lumpur, Malaysia
Abstract:Nanofluids were prepared by dispersing Cu nanoparticles (~20 nm) in n-tetradecane by a two-step method. The effective thermal conductivity was measured for various nanoparticle volume fractions (0.0001–0.02) and temperatures (306.22–452.66 K). The experimental data compares well with the Jang and Choi model. The thermal conductivity enhancement was lower above 391.06 K than for that between 306.22 and 360.77 K. The interfacial thermal resistance increased with increasing temperature. The effective thermal conductivity enhancement was greater than that obtained with a more viscous fluid as the base media at 452.66 K because of nanoconvection induced by nanoparticle Brownian motion at high temperature.
Keywords:Nanofluid  Thermal conductivity  High temperature  Brownian motion
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