Effects of a turbulent wall jet on heat transfer over a non-confined backward-facing step |
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| Institution: | 1. Université Lille Nord de France, F-59000 Lille, France;2. UVHC, TEMPO, F-59313 Valenciennes, France;3. Département TecHnologie Et Modélisation des Infrastructures du Système électrique (THEMIS), EDF Research and Development, F-92140 Clamart, France;1. Unité de Recherche en Energies Renouvelables en Milieu Saharien, URERMS, Centre de Développement des Energies Renouvelables, CDER 01000, Adrar, Algeria;2. Département de Mécanique, Faculté de Technologie, Université de Batna 2, Algeria;3. Institut des Sciences Vétérinaires et des Sciences Agronomiques, Université de Batna 1, Algeria;1. Department of Radioecology, Institute for Environmental Sciences, 1-7 Ienomae, Obuchi, Rokkasho, Kamikita, Aomori 039-3212, Japan;2. Institute of Radiation Emergency Medicine, Hirosaki University, 66-1 Motomachi, Hirosaki City, Aomori 036-8564, Japan;1. Department of Chemical Engineering, University of Guanajuato, DCNE, Col. Norial Alta s/n, C.P. 36050 Guanajuato, Gto., Mexico;2. Department of Metal-Mechanical, Technological University of Guanajuato Southwest, Valle-Huanimaro km. 1.2, Valle de Santiago, Gto., Mexico;3. Interdisciplinary Professional Unit of Engineering Campus Guanajuato, National Institute Polytechnic, Av. Mineral de Valenciana 200 Fracc, Industrial Puerto Interior, Silao de la Victoria, Mexico;4. Department of Mechanical Engineering, Engineering Division, Campus Irapuato-Salamanca, University of Guanajuato, Salamanca, Gto., Mexico |
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| Abstract: | Experimental and numerical analysis of a turbulent wall jet on the heat transfer downstream of a non-confined backward-facing step are presented. Several configurations are studied to analyse the influence of the upstream flow and the height of the step. An infrared camera and a hot wire were used to visualize a temperature map and measure the instantaneous velocity, respectively. The main objective was to visualize and compare both the fluid flow and the heat transfer, by studying the skin friction coefficient Cf and the Nusselt number Nud, respectively. The latter is obtained by the calculation of the heat transfer coefficient, evaluated by inverse method. Both experimental data and numerical approach provide good agreement regarding the flow structure and thermal data for measuring the position and the value of characteristics scales in the recirculation zone. A correlation between the maximum heat transfer Numax and the maximum Reynolds number Remax is presented. Similarities and differences are highlighted in the paper compared to confined configurations. |
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| Keywords: | Non-confined backward-facing step Turbulent wall jet flow Hot wire measurements Infrared measurements Inverse method Turbulence modeling |
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