Numerical investigation of heat transfer and entropy generation of laminar flow in helical tubes with various cross sections
This study evaluates heat transfer performance and entropy generation of laminar flow in coiled tubes with various cross-sections geometries i.e. circular, ellipse and square, relatives to the straight tubes of similar cross-sections. A computational fluid dynamics model is developed and validated a...
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my.utp.eprints.256332021-08-27T09:40:36Z Numerical investigation of heat transfer and entropy generation of laminar flow in helical tubes with various cross sections Kurnia, J.C. Sasmito, A.P. Shamim, T. Mujumdar, A.S. This study evaluates heat transfer performance and entropy generation of laminar flow in coiled tubes with various cross-sections geometries i.e. circular, ellipse and square, relatives to the straight tubes of similar cross-sections. A computational fluid dynamics model is developed and validated against empirical correlations. Good agreement is obtained within range of Reynolds and Dean numbers considered. Effect of geometry, wall temperature, Reynolds number and heating/cooling mode were examined. To evaluate the heat transfer performance of the coiled tube configurations, a parameter referred as Figure of Merit (FoM) is defined as the ratio heat transfer rate to the required pumping power. In addition, exergy analysis is carried out to examine the inefficiency of the coiled tube configurations. The results indicate that coiled tubes provide higher heat transfer rate. In addition, it was found to be more efficient as reflected by lower entropy generation as compared to straight tubes. Among the studied cross-section, square cross-section generates the highest entropy, followed by ellipse and circular counterpart. Entropy production from heat transfer contribution is two order-of-magnitude higher than that of entropy contribution from viscous dissipation. Cooling case produces slightly higher entropy than heating counterpart. Finally, this study can provide practical guideline to design more efficient coiled heat exchanger. Crown Copyright © 2016 Published by Elsevier Ltd. All rights reserved. Elsevier Ltd 2016 Article NonPeerReviewed https://www.scopus.com/inward/record.uri?eid=2-s2.0-84963850010&doi=10.1016%2fj.applthermaleng.2016.04.037&partnerID=40&md5=6b4b032fd116fb890e3ff3838355e4a5 Kurnia, J.C. and Sasmito, A.P. and Shamim, T. and Mujumdar, A.S. (2016) Numerical investigation of heat transfer and entropy generation of laminar flow in helical tubes with various cross sections. Applied Thermal Engineering, 102 . pp. 849-860. http://eprints.utp.edu.my/25633/ |
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This study evaluates heat transfer performance and entropy generation of laminar flow in coiled tubes with various cross-sections geometries i.e. circular, ellipse and square, relatives to the straight tubes of similar cross-sections. A computational fluid dynamics model is developed and validated against empirical correlations. Good agreement is obtained within range of Reynolds and Dean numbers considered. Effect of geometry, wall temperature, Reynolds number and heating/cooling mode were examined. To evaluate the heat transfer performance of the coiled tube configurations, a parameter referred as Figure of Merit (FoM) is defined as the ratio heat transfer rate to the required pumping power. In addition, exergy analysis is carried out to examine the inefficiency of the coiled tube configurations. The results indicate that coiled tubes provide higher heat transfer rate. In addition, it was found to be more efficient as reflected by lower entropy generation as compared to straight tubes. Among the studied cross-section, square cross-section generates the highest entropy, followed by ellipse and circular counterpart. Entropy production from heat transfer contribution is two order-of-magnitude higher than that of entropy contribution from viscous dissipation. Cooling case produces slightly higher entropy than heating counterpart. Finally, this study can provide practical guideline to design more efficient coiled heat exchanger. Crown Copyright © 2016 Published by Elsevier Ltd. All rights reserved. |
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Kurnia, J.C. Sasmito, A.P. Shamim, T. Mujumdar, A.S. |
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Kurnia, J.C. Sasmito, A.P. Shamim, T. Mujumdar, A.S. Numerical investigation of heat transfer and entropy generation of laminar flow in helical tubes with various cross sections |
author_facet |
Kurnia, J.C. Sasmito, A.P. Shamim, T. Mujumdar, A.S. |
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Kurnia, J.C. |
title |
Numerical investigation of heat transfer and entropy generation of laminar flow in helical tubes with various cross sections |
title_short |
Numerical investigation of heat transfer and entropy generation of laminar flow in helical tubes with various cross sections |
title_full |
Numerical investigation of heat transfer and entropy generation of laminar flow in helical tubes with various cross sections |
title_fullStr |
Numerical investigation of heat transfer and entropy generation of laminar flow in helical tubes with various cross sections |
title_full_unstemmed |
Numerical investigation of heat transfer and entropy generation of laminar flow in helical tubes with various cross sections |
title_sort |
numerical investigation of heat transfer and entropy generation of laminar flow in helical tubes with various cross sections |
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Elsevier Ltd |
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2016 |
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https://www.scopus.com/inward/record.uri?eid=2-s2.0-84963850010&doi=10.1016%2fj.applthermaleng.2016.04.037&partnerID=40&md5=6b4b032fd116fb890e3ff3838355e4a5 http://eprints.utp.edu.my/25633/ |
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