Experimental investigation and development of new correlations for thermal conductivity of CuO/EG–water nanofluid |
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| Affiliation: | 1. Department of Mechanical Engineering, Najafabad Branch, Islamic Azad University, Isfahan, Iran;2. Faculty of Mechanical Engineering, Semnan University, Semnan, Iran;3. Fluid Mechanics, Thermal Engineering and Multiphase Flow Research Lab. (FUTURE), Department of Mechanical Engineering, Faculty of Engineering, King Mongkut''s University of Technology Thonburi, Bangmod, Bangkok 10140, Thailand;4. Young Researchers and Elite Club, Mashhad Branch, Islamic Azad University, Mashhad, Iran;5. Department of Mechanical Engineering, Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia;1. Young Researchers and Elite Club, Khomeinishahr Branch, Islamic Azad University, Isfahan, Iran;2. Department of Energy and Refrigerating Air-Conditioning Engineering, National Taipei University of Technology, Taipei 10608, Taiwan, ROC;3. Department of Mechanical Engineering, Najafabad Branch, Islamic Azad University, Najafabad, Iran;4. Department of Mechanical Engineering, Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia |
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| Abstract: | In the present study, the thermal conductivity of CuO/EG–water nanofluid in different solid concentrations and temperatures has been experimentally investigated. Using a two-step method, the nanofluid has been produced in different solid concentrations ranging from 0.1% to 2% and temperatures up to 50 °C. The thermal conductivity of the nanofluid has been experimentally measured using the KD2 Pro instrument. Based on the experimental data, new correlations for predicting the thermal conductivity of CuO/EG–water at different temperatures have been proposed. The results show that with the increase of the solid concentration, the thermal conductivity of the nanofluid increases. Furthermore, the thermal conductivity of the nanofluid increases while the temperature increases. This increase is by far more noticeable in higher solid concentrations compared with lower solid volume fraction. This means that it is the presence of nanoparticles in the base fluid that causes the increase of the effect of temperature on the thermal conductivity. |
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