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Numerical and experimental investigations of heat transfer performance of rectangular coil heat exchangers |
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| Authors: | I Conté XF Peng |
| Affiliation: | 1. Mechanical Engineering Department, Amirkabir University of Technology (Tehran Polytechnic), 424 Hafez Avenue, P.O. Box 15875-4413, Tehran, Iran;2. Division of Computational Physics, Institute for Computational Science, Ton Duc Thang University, Ho Chi Minh City, Vietnam;3. Faculty of Electrical and Electronics Engineering, Ton Duc Thang University, Ho Chi Minh City, Vietnam;4. Department of Chemical Engineering, Iran University of Science and Technology (IUST), Iran Narmak, 16846-13114, Tehran, Iran;5. Young Researchers and Elite Club, Khomeinishahr Branch, Islamic Azad University, Khomeinishahr, Iran;6. Department of Automotive and Marine Engineering Technology, College of Technological Studies, The Public Authority for Applied Education and Training, Kuwait;1. Department of Chemical Engineering, Curtin University, Perth, Western Australia, Australia;2. School of Public Health, Curtin Health Innovation Research Institute, Curtin University, Perth, Western Australia, Australia;3. DBT-ICT-Centre of Energy Biosciences, Institute of Chemical Technology (ICT), Mumbai, India |
| Abstract: | Both numerical and experimental investigations were conducted to understand convective heat transfer from a single round pipe coiled in rectangular pattern. The studied heat exchangers are composed with inner and outer coils so that the exterior flow is very similar to flow within tube-bundles. The inner and outer coils of the heat exchangers are in turn composed of bends and straight portions. Calculations and experiments were done for two cases with different outside flow arrangements. The results showed the effects of geometric arrangement with better heat transfer for the case 1 of staggered arrangement due mainly to its more tortuous flow characteristics and better mixing of the exterior fluid. The numerical and experimental results qualitatively agree well with each other. The numerical and experimental results showed that coiling a pipe so that an exterior fluid flows over or in tube bundle can help to induce the turbulence without increasing the velocity. |
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