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A comprehensive study of two-phase flow and heat transfer of water/Ag nanofluid in an elliptical curved minichannel
Authors:Sajad Mir  Omid Ali Akbari  Davood Toghraie  Ghanbarali Sheikhzadeh  Ali Marzban  Saeid Mir  Pouyan Talebizadehsardari
Affiliation:1. Department of Mechanical Engineering, Aligoudarz Branch, Islamic Azad University, Aligoudarz, Iran;2. Young Researchers and Elite Club, Khomeinishahr Branch, Islamic Azad University, Khomeinishahr, Iran;3. Department of Mechanical Engineering, Khomeinishahr Branch, Islamic Azad University, Khomeinishahr, Iran;4. Department of Mechanical Engineering, University of Kashan, Kashan, Iran;5. Department for Management of Science and Technology Development, Ton Duc Thang University, Ho Chi Minh City, Vietnam;6. Faculty of Applied Sciences, Ton Duc Thang University, Ho Chi Minh City, Vietnam;1. Jiangsu Key Laboratory of Process Enhancement and New Energy Equipment Technology, Jiangsu Engineering Laboratory of Energy Conservation and Environmental Protection Technologies and Equipment in Process Industry, Nanjing 211816, China;2. School of Mechanical and Power Engineering, Nanjing Tech University, Nanjing 211816, China;3. College of Chemistry and Chemical Engineering, Nanjing Tech University, Nanjing 210009, China;4. School of Engineering, Edith Cowan University, 270 Joondalup Drive, Joondalup, WA6027, Australia;1. State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China;2. Huntsman Polyurethanes, B3078 Everberg, Belgium;1. Liaoning Key Laboratory of Clean Utilization of Chemical Resources, Institute of Chemical Engineering, Dalian University of Technology, Dalian 11624, China;2. School of Chemical Engineering, Inner Mongolia University of Science & Technology, Inner Mongolia, Baotou 014010, China;1. Faculty of Production Engineering and Logistics, Opole University of Technology, 76 Proszkowska St., 45-758 Opole, Poland;2. Faculty of Mechanical Engineering, Opole University of Technology, 76 Proszkowska St., 45-758 Opole, Poland
Abstract:In this research, laminar flow and heat transfer of two-phase water/Ag nanofluid with 0-6% volume fraction of nanoparticles at Re=150-700 in a curved geometry are simulated using finite volume method. Studied geometry is an elliptical curved minichannel with curvature angle of 180°. Forced and natural flow of two-phase nanofluid is simulated at Gr=15000, 35000 and 75000. For estimation of nanofluid flow behavior, two-phase mixture method is used. The second-order discretization and SIMPLEC algorithm are used for solving governing equations. The results indicate that the increase of volume fraction of nanoparticles leads to the enhancement of the temperature of central line of flow. The increase of Grashof number (Gr~75000) has a great effect on reduction of dimensionless temperature in central line of flow. Creation of thermal boundary layer at Re=500 and after the angle of 30° becomes significant. In low Grashof numbers (Gr~15000), due to the great effects of temperature gradients close to wall, these regions have significant entropy generation.
Keywords:Elliptical minichannel  Mixed convection  Numerical study  Nanofluid  Finite volume method  Friction factor  
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