Heat transfer enhancement and pressure drop characteristics of TiO2–water nanofluid in a double-tube counter flow heat exchanger |
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| Authors: | Weerapun Duangthongsuk Somchai Wongwises |
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| Affiliation: | 1. Department of Chemistry, Payame Noor University (PNU), P.O.Box, 19395-3697, Tehran, Iran, P.O.Box, 19395-3697, Tehran, Iran;2. Faculty of Mechanical Engineering, Shahrood University of Technology, Shahrood, Iran;3. Department of Renewable Energy and Environmental Engineering, University of Tehran, Tehran, Iran;4. Mechanical Engineering Department, Prince Sultan Endowment for Energy and Environment, Prince Mohammad Bin Fahd University, Al-, Khobar 31952, Saudi Arabia;5. RAK Research and Innovation Center, American University of Ras Al Khaimah, P.O. Box 10021, Ras Al Khaimah, United Arab Emirates;1. Department of Mechanical Engineering, J.N.T.U. College of Engineering, Kukatpally, Hyderabad, India;2. Department of Mechanical Engineering, University of Gondar, Gondar, Ethiopia;3. Centre for Mechanical Technology and Automation (TEMA), Department of Mechanical Engineering, University of Aveiro, Aveiro, Portugal;1. Young Researchers and Elite Club, Mashhad Branch, Islamic Azad University, Mashhad, Iran;2. Department of Mechanical Engineering, KBU International College, 47800 Petaling Jaya, Selangor, Malaysia;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;5. Department of Mechanical Engineering and Advanced Material Research Centre, University of Malaya, 50603 Kuala Lumpur, Malaysia;6. Mechanical Engineering Department, The University of Tulsa, Tulsa, OK, USA;7. 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, Thailand;8. Department of Electrical Engineering, Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia |
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| Abstract: | This article reports an experimental study on the forced convective heat transfer and flow characteristics of a nanofluid consisting of water and 0.2 vol.% TiO2 nanoparticles. The heat transfer coefficient and friction factor of the TiO2–water nanofluid flowing in a horizontal double-tube counter flow heat exchanger under turbulent flow conditions are investigated. The Degussa P25 TiO2 nanoparticles of about 21 nm diameter are used in the present study. The results show that the convective heat transfer coefficient of nanofluid is slightly higher than that of the base liquid by about 6–11%. The heat transfer coefficient of the nanofluid increases with an increase in the mass flow rate of the hot water and nanofluid, and increases with a decrease in the nanofluid temperature, and the temperature of the heating fluid has no significant effect on the heat transfer coefficient of the nanofluid. It is also seen that the Gnielinski equation failed to predict the heat transfer coefficient of the nanofluid. Finally, the use of the nanofluid has a little penalty in pressure drop. |
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