Development of new correlations for convective heat transfer and friction factor in turbulent regime for nanofluids |
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| Authors: | Ravikanth S. Vajjha Debendra K. Das Devdatta P. Kulkarni |
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| Affiliation: | 1. Department of Mechanical Engineering, National Cheng Kung University, Tainan 70101, Taiwan;2. Department of Energy and Refrigerating Air-Conditioning Engineering, National Taipei University of Technology, Taipei 10608, Taiwan;3. School of Chemical Engineering, College of Engineering, University of Tehran, Tehran, Iran;1. School of Chemical, Petroleum, and Gas Engineering, Semnan University, Semnan 35131-19111, Iran;2. Materials and Energy Research Center (MERC), Karaj, Iran;1. Department of Chemical Engineering, Laxminarayan Institute of Technology, Rashtrasant Tukadoji Maharaj Nagpur University, Nagpur 440033, MS, India;2. Department of Chemical Engineering, National Institute of Technology, Warangal 506004, Telangana, India;1. Mechanical Engineering Department, Yazd University, Yazd, Iran;2. Faculty of Mechanical Engineering, Tarbiat Modares University, Tehran, Iran;1. Faculty of Mechanical Engineering, Universiti Malaysia Pahang, 26600 Pekan, Pahang, Malaysia;2. Department of Mechanical Engineering, JNTUH College of Engineering, Manthani, Andhra Pradesh, India;3. GITAM University, Rishikonda, Visakhapatnam, India;4. Department of Mechanical Engineering, GVP College of Engineering, Visakhapatnam, AP, India |
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| Abstract: | This paper presents new correlations for the convective heat transfer and the friction factor developed from the experiments of nanoparticles comprised of aluminum oxide, copper oxide and silicon dioxide dispersed in 60% ethylene glycol and 40% water by mass. The experimental measurements were carried out in the fully developed turbulent regime for the aforementioned three different nanofluids at various particle volumetric concentrations. First, the rheological and the thermophysical properties such as viscosity, density, specific heat and thermal conductivity were measured at different temperatures for varying particle volume concentrations. Next, these properties were used to develop the heat transfer coefficient correlation from experiments, as a function of these properties and the particle volumetric concentration. The pressure loss was also measured and a new correlation was developed to represent the friction factor for nanofluids. |
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