Influence of T-semi attached rib on turbulent flow and heat transfer parameters of a silver-water nanofluid with different volume fractions in a three-dimensional trapezoidal microchannel |
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| Affiliation: | 1. Young Researchers and Elite Club, Khomeinishahr Branch, Islamic Azad University, Khomeinishahr, Iran;2. Department of Mechanical Engineering, Najafabad Branch, Islamic Azad University, Najafabad, Iran;3. Young Researchers and Elite Club, Mashhad Branch, Islamic Azad University, Mashhad, Iran;4. Department of Mechanical Engineering, Khomeinishahr Branch, Islamic Azad University, Khomeinishahr, Iran;1. University of Sfax, Faculty of Sciences, Laboratory of Condensed Matter, BP1171, 3018 Sfax, Tunisia;2. LUNAM Université, Université du Maine, CNRS UMR 6283, Institut des Molécules et Matériaux du Mans(IMMM), Avenue Olivier Messiaen, F-72085 Le Mans Cedex 09, France;1. Faculty of Agro Based Industry, Universiti Malaysia Kelantan, 17600 Jeli, Kelantan, Malaysia;2. School of Mathematical Sciences, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor, Malaysia;3. Department of Mathematics, Babeş-Bolyai University, R-400084 Cluj-Napoca, Romania;1. Division of Heat Transfer, Department of Energy Sciences, Lund University, P.O. Box 118, SE-22100 Lund, Sweden;2. School of Marine Science and Technology, Northwestern Polytechnical University, Xi''an 710072, Shaanxi, China;1. Mechanical and Energy Engineering Department, Shahid Beheshti University, Tehran, Iran;2. Department of Chemical Engineering, Faculty of Engineering, University of Tehran, Tehran, Iran;3. Department of Renewable Energies Engineering, Faculty of New Sciences & Technologies, University of Tehran, Tehran, Iran;4. Renewable Energies, Magnetism and Nanotechnology Lab., Faculty of Science, Ferdowsi University of Mashhad, Mashhad, Iran;5. Department of Refrigerating Air-Conditioning Engineering, National Taipei University of Technology, Taipei 10608, Taiwan;1. Key Laboratory of Thermal Fluid Science and Engineering of Ministry of Education, Xi’an Jiaotong University, Xi’an, Shaanxi Province 710049, China;2. School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an, Shaanxi Province 710049, China |
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| Abstract: | This study aimed at exploring influence of T-semi attached rib on the turbulent flow and heat transfer parameters of a silver-water nanofluid with different volume fractions in a three-dimensional trapezoidal microchannel. For this purpose, convection heat transfer of the silver-water nanofluid in a ribbed microchannel was numerically studied under a constant heat flux on upper and lower walls as well as isolated side walls. Calculations were done for a range of Reynolds numbers between 10,000 and 16,000, and in four different sorts of serrations with proportion of rib width to hole of serration width (R/W). The results of this research are presented as the coefficient of friction, Nusselt number, heat transfer coefficient and thermal efficiency, four different R/W microchannels. The results of numerical modeling showed that the fluid's convection heat transfer coefficient is increased as the Reynolds number and volume fraction of solid nanoparticle are increased. For R/W=0.5, it was also maximum for all the volume fractions of nanoparticle and different Reynolds numbers in comparison to other similar R/W situations. That's while friction coefficient, pressure drop and pumping power is maximum for serration with R/W=0 compared to other serration ratios which lead to decreased fluid-heat transfer performance. |
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| Keywords: | Nanofluid Ribbed microchannel Nusselt number Local friction factor |
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