Numerical analysis of natural convection in air in a vertical convergent channel with uniformly heated conductive walls |
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| Affiliation: | 1. Dipartimento di Energetica, Termofluidodinamica applicata e Condizionamenti ambientali, Università di Napoli Federico II, Napoli, 80125, Italy;2. Dipartimento di Ingegneria Aerospaziale e Meccanica, Seconda Università di Napoli, Aversa (CE), 81031, Italy;1. Department of Mechanical Engineering Aginaw Valley State University, University Center, MI, 48710, USA;2. School of Aerospace and Mechanical Engineering, University of Oklahoma, Norman, OK, 73019, USA;1. Unité de Métrologie et des Systèmes Énergétiques, École Nationale d’Ingénieurs, Monastir, University of Monastir, 5000, Tunisia;2. College of Engineering, Mechanical Engineering Dept, Haïl University, Haïl City, Saudi Arabia;3. Department of Mechanical Engineering, Technology Faculty, Fırat University, Elazig, Turkey;4. Dept. of Automotive and Marine Engineering Technology, College of Technological Studies, The Public Authority for Applied Education and Training, Kuwait;5. Department of Mechanical Engineering, King Abdulaziz University, Jeddah, Saudi Arabia;1. Unité de recherche de métrologie et des systèmes énergétiques, Ecole nationale d’ingénieurs de Monastir, Monastir 5012, Tunisia;2. Institut PPRIME, Département Fluide-Thermique-Combustion, Boulevard Pierre et Marie Curie, BP 30179, 86962 Futuroscope-Chasseneuil, France |
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| Abstract: | Natural convection in air in a convergent channel with the two principal flat plates at uniform heat flux with finite thickness and thermal conductivity was numerically investigated. Laminar, two-dimensional steady-state conditions were assumed. An extended computational domain was adopted, which allows to take into account the diffusion by both momentum and energy outside the channel. A comparison with experimental data was carried out. Stream function and temperature fields are presented. Average Nusselt numbers were evaluated and presented.Temperature profiles are strongly affected by the convergence angle at low Rayleigh numbers. At the lower minimum gap, streamlines and isotherms show a low pressure region in the channel due to a choked flow in its upper end. Numerical values of the Nusselt number are in good agreement with experimental results. |
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