The effect of different inlet geometries on laminar flow combined convection heat transfer inside a horizontal circular pipe |
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| Authors: | Hussein A Mohammed |
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| Affiliation: | 1. Tomsk Scientific Center SB RAS, Akademicheskiy Av., 10/4, Tomsk 634055, Russia;2. Far Eastern Federal University, Suhanova St., 8, Vladivostok 690950, Russia;1. School of Engineering, Aerospace, Mechanical and Manufacturing, RMIT University, Melbourne, VIC 3053, Australia;2. Queensland Micro and Nanotechnology Centre, Griffith University, Brisbane, QLD 4111, Australia;1. Associated Laboratory of Plasma, National Institute for Space Research, S. J. Campos, S. Paulo, Brazil;2. Institute of Ion Beam Physics and Materials Research, P. O. Box 510109, 01314, Dresden, Germany;3. Institut Pprime-UPR 3346 CNRS-Université de Poitiers-ENSMA, France;4. Departamento de Física, UFPR, CP 19044, 81531-990, Curitiba, PR, Brazil;1. Department of Mechanical Engineering, Indian Institute of Technology Guwahati, Assam 781039, India;2. Fluid Mechanics, Thermal Engineering and Multiphase Flow Research Lab (FUTURE), Department of Mechanical Engineering, Faculty of Engineering, King Mongkut’s University of Technology Thonburi, Bangmod, Bangkok 10140, Thailand;3. The Academy of Science, The Royal Society of Thailand, Sanam Suea Pa, Dusit, Bangkok 10300, Thailand;1. LGP2ES Irstea-GPAN, 1, rue Pierre-Gilles de Gennes, CS 10030, 92761 Antony Cedex, France;2. University of Reims Champagne-Ardenne, URCA/GRESPI EA4694/Thermo-mécanique, UFR Sciences, 51687 Reims Cedex 2, France;3. LEGI, UMR 5519, Domaine Universitaire BP 53, 38041 Grenoble Cedex 9, France |
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| Abstract: | The effect of different inlet geometries on laminar air flow combined convection heat transfer inside a horizontal circular pipe has been experimentally investigated for Reynolds number range of 400–1600, and the Grashof number range from 3.12 × 105 to 1.72 × 106. The experimental setup consists of an aluminum circular pipe as a heated section with 30 mm inside diameter and 900 mm heated length (L/D = 30) with different inlet geometries. A wall boundary heating condition of a uniform heat flux was imposed. The inlet configurations used in this paper are calming sections having the same inside diameter as the heated pipe but with variable lengths of Lcalm. = 600 mm (L/D = 20), Lcalm. = 1200 mm (L/D = 40), Lcalm. = 1800 mm (L/D = 60), Lcalm. = 2400 mm (L/D = 80), sharp-edged and bell-mouth. It was found that the surface temperature values for calming section length corresponding to (L/D = 80) were higher than other inlet geometries due to the lower mass flow rate and higher flow resistance. It was also observed that the Nusselt number values for bell-mouth inlet geometry were higher than other inlet geometries due to the differences in the average temperatures and densities of the air. The average heat transfer results were correlated with an empirical correlation in terms of dependent parameters of Grashof, Prandtl and Reynolds numbers. The proposed correlation was compared with available literature and it shows reasonable agreement. |
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