Increasing heat transfer of non-Newtonian nanofluid in rectangular microchannel with triangular ribs |
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| 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;1. Institute of Applied Micro-Nano Science and Technology, Chongqing Technology and Business University, 19 Xuefu Ave., Nan’an District, Chongqing, China;2. Chongqing Engineering Laboratory for Detection, Control and Integrated System, Chongqing Technology and Business University, 19 Xuefu Ave., Nan''an District, Chongqing, China;3. Department of Micro and Nano Systems Technology (IMST), Faculty of Technology and Maritime Sciences (TekMar), Buskerud and Vestfold University College (HBV), Raveien 215, 3184 Borre, Norway;1. Programa Regional de Posgrado en Biotecnología, Facultad de Ciencias Químico Biológicas, Universidad Autónoma de Sinaloa, CP 80013, Culiacán, Sinaloa, Mexico;2. Chemical Engineering Department, Facultad de Ciencias Químico Biológicas, Universidad Autónoma de Sinaloa, CP 80013, Culiacán, Sinaloa, Mexico;3. Chemical Engineering Department, Universidad Michoacana de San Nicolás de Hidalgo, CP 58060, Morelia, Michoacán, Mexico;1. School of Engineering and Materials Science, Queen Mary University of London, Mile End Road, London E1 4NS, UK;2. Key Laboratory of Enhanced Heat Transfer and Energy Conservation, Ministry of Education, College of Environmental and Energy Engineering, Beijing University of Technology, Beijing, China;1. Department of Mechanical and Power Engineering, School of Marine Science and Technology, Northwestern Polytechnical University, P.O. Box 24, 710072 Xi’an, Shaanxi, China;2. School of Mechanical Engineering, Northwestern Polytechnical University, P.O. Box 552, 710072 Xi’an, Shaanxi, China;3. Department of Mechanical Engineering, National Chiao Tung University, EE474, 1001 University Road, Hsinchu 300, Taiwan |
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| Abstract: | In this study, computational fluid dynamics and the laminar flow of the non-Newtonian fluid have been numerically studied. The cooling fluid includes water and 0.5 wt% Carboxy methyl cellulose (CMC) making the non-Newtonian fluid. In order to make the best of non-Newtonian nanofluid in this simulation, solid nanoparticles of Aluminum Oxide have been added to the non-Newtonian fluid in volume fractions of 0–2% with diameters of 25, 45 and 100 nm. The supposed microchannel is rectangular and two-dimensional in Cartesian coordination. The power law has been used to speculate the dynamic viscosity of the cooling nanofluid. The field of numerical solution is simulated in the Reynolds number range of 5 < Re < 300. A constant heat flux of 10,000 W/m2 is exercised on the lower walls of the studied geometry. Further, the effect of triangular ribs with angle of attacks of 30°, 45° and 60° is studied on flow parameters and heat transfer due to the fluid flow. The results show that an increase in the volume fraction of nanoparticles as well as the use for nanoparticles with smaller diameters lead to greater heat transfer. Among all the studied forms, the triangular rib from with an angle of attack 30° has the biggest Nusselt number and the smallest pressure drop along the microchannel. Also, an increase in the angle of attack and as a result of a sudden contact between the fluid and the ribs and also a reduction in the coflowing length (length of the rib) cause a cut in heat transfer by the fluid in farther parts from the solid wall (tip of the rib). |
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| Keywords: | Non-Newtonian nanofluid Ribbed microchannel Triangular rib Angle of attack Carboxy methyl cellulose (CMC) |
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