Flow and heat transfer characteristics of finned tube with internal and external fins in air cooler for waste heat recovery of gas-fired boiler system |
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| Affiliation: | 1. Jiangsu Key Laboratory of Process Enhancement and New Energy Equipment Technology, School of Mechanical and Power Engineering, Nanjing University of Technology, No. 5 Xin Mo Fan Road, Nanjing 210009, PR China;2. Jiangsu China Nuclear Industry Huawei Engineering Design and Research Co., Ltd., No. 79 Yun Long Shan Road, Nanjing 210019, PR China;1. State University of Maringá (UEM), Chemical Engineering Department, Avenida Colombo, 5790, Maringá, PR CEP 87020-900, Brazil;2. School of Chemical, Biological and Materials Engineering, University of Oklahoma, Norman, OK 73019, USA;3. Institute of Chemistry, Rio de Janeiro State University (UERJ), Rua São Francisco Xavier, 524, Maracanã, Rio de Janeiro, RJ CEP 20550-900, Brazil;1. Key Laboratory of Thermo-Fluid Science and Engineering of MOE, School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an, China;2. Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, IL, USA;1. Universidad Autónoma de Nuevo León, Facultad de Ingeniería Mecánica y Eléctrica (FIME), Laboratory for Research and Innovation in Energy Technology (LIITE), Av. Universidad s/n, Ciudad Universitaria, San Nicolás de los Garza, Nuevo León, C.P. 66455, México;2. Department of Chemical Engineering, DCNE, University of Guanajuato, Col. Noria Alta s/n, C. P. 36050, Guanajuato, Gto., México;3. Department of Mechanical Engineering, Engineering Division, Campus Irapuato-Salamanca, University of Guanajuato, Salamanca-Valle de Santiago km 3.5+1.8, CP 36885, Mexico |
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| Abstract: | In this present study, attempts were made to investigate the flow and heat transfer characteristics of finned tube with internal fins and external fins by experiment and numerical simulation. The test finned tube was installed in a single smooth tube and formed a shell-and-tube heat exchanger. The experiments were conducted in heat transfer test system with hot air in the tube side and cold air in the shell side. Overall heat transfer coefficients were calculated and heat transfer coefficients in the tube side were determined. Three-dimension computation was performed to predict the flow and heat transfer performance in the finned tube. The effects of external fin height and pitch of the finned tube on shell-side flow and heat transfer were studied by numerical simulation. The numerical results agree well with the measurements. The maximum differences between the present numerical results and the experimental data are approximately 6.9% for heat transfer coefficient and 4.7% for friction factor, respectively. The velocity and temperature fields are obtained to discern the mechanisms of heat transfer enhancement. Numerical results indicate that the steady and spatially periodic growth and disruption of vortices occur in external fin to fin region. |
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| Keywords: | Finned tube Heat transfer coefficient Friction factor Experiment Numerical simulation |
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