Numerical study on the nanofluid flows and temperature behaviors in the spirally coiled tubes with helical ribs
The nanofluids heat transfer and flow behaviors in the spirally coiled tube with and without helical ribs are simulated using the Eulerian two-phase turbulent model. A model used in the present study is 8.5 mm diameter copper tube, bending into the spirally coiled tube with and without helical ribs...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2021-10-01
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| Series: | Case Studies in Thermal Engineering |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2214157X21003671 |
| _version_ | 1818732036207149056 |
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| author | P. Naphon S. Wiriyasart R. Prurapark A. Srichat |
| author_facet | P. Naphon S. Wiriyasart R. Prurapark A. Srichat |
| author_sort | P. Naphon |
| collection | DOAJ |
| description | The nanofluids heat transfer and flow behaviors in the spirally coiled tube with and without helical ribs are simulated using the Eulerian two-phase turbulent model. A model used in the present study is 8.5 mm diameter copper tube, bending into the spirally coiled tube with and without helical ribs under constant wall temperature conditions. As flowing in the spirally coiled tube, the secondary flow is induced by the centrifugal force. In contrast, the swirling flow is caused by the pipe's helical ribs, which have significant effects on the Brownian motion of nanoparticles suspending the base fluid and then results in higher heat transfer enhancement. It can be found that the helical rib configurations have a significant effect on the velocity and temperature contours. The Nusselt number from the spirally coiled tube with helical ribs is 12.45% higher than those without helical ribs. However, due to more flow complexity and roughness augmentation, the pressure drop across the test section also increases. Besides, adding 0.05% nanoparticles by volume to water enhances the Nusselt number by 8.21%—also, the overall enhancement in heat transfer. |
| first_indexed | 2024-12-17T23:27:11Z |
| format | Article |
| id | doaj.art-2684552a1b47460b88ff098194185bd9 |
| institution | Directory Open Access Journal |
| issn | 2214-157X |
| language | English |
| last_indexed | 2024-12-17T23:27:11Z |
| publishDate | 2021-10-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Case Studies in Thermal Engineering |
| spelling | doaj.art-2684552a1b47460b88ff098194185bd92022-12-21T21:28:45ZengElsevierCase Studies in Thermal Engineering2214-157X2021-10-0127101204Numerical study on the nanofluid flows and temperature behaviors in the spirally coiled tubes with helical ribsP. Naphon0S. Wiriyasart1R. Prurapark2A. Srichat3Thermo-Fluid and Heat Transfer Enhancement Lab. (TFHT), Department of Mechanical Engineering, Faculty of Engineering, Srinakharinwirot University, 63 Rangsit-Nakhornnayok Rd., Ongkharak, Nakhorn-Nayok, 26120, Thailand; Corresponding author.Thermo-Fluid and Heat Transfer Enhancement Lab. (TFHT), Department of Mechanical Engineering, Faculty of Engineering, Srinakharinwirot University, 63 Rangsit-Nakhornnayok Rd., Ongkharak, Nakhorn-Nayok, 26120, ThailandDepartment of Petroleum and Natural Gas Engineering, Faculty of Engineering, Srinakharinwirot University, 63 Rangsit-Nakhornnayok Rd., Ongkharak, Nakhorn-Nayok, 26120, ThailandDepartment of Mechanical Engineering, Faculty of Technology, Udon Thani Rajabhat University, 243/12, Muang, Udon-thani, 4100, ThailandThe nanofluids heat transfer and flow behaviors in the spirally coiled tube with and without helical ribs are simulated using the Eulerian two-phase turbulent model. A model used in the present study is 8.5 mm diameter copper tube, bending into the spirally coiled tube with and without helical ribs under constant wall temperature conditions. As flowing in the spirally coiled tube, the secondary flow is induced by the centrifugal force. In contrast, the swirling flow is caused by the pipe's helical ribs, which have significant effects on the Brownian motion of nanoparticles suspending the base fluid and then results in higher heat transfer enhancement. It can be found that the helical rib configurations have a significant effect on the velocity and temperature contours. The Nusselt number from the spirally coiled tube with helical ribs is 12.45% higher than those without helical ribs. However, due to more flow complexity and roughness augmentation, the pressure drop across the test section also increases. Besides, adding 0.05% nanoparticles by volume to water enhances the Nusselt number by 8.21%—also, the overall enhancement in heat transfer.http://www.sciencedirect.com/science/article/pii/S2214157X21003671Swirling and secondary flowsNanofluidsSpirally coiled tubeHelical ribsNumerical study |
| spellingShingle | P. Naphon S. Wiriyasart R. Prurapark A. Srichat Numerical study on the nanofluid flows and temperature behaviors in the spirally coiled tubes with helical ribs Case Studies in Thermal Engineering Swirling and secondary flows Nanofluids Spirally coiled tube Helical ribs Numerical study |
| title | Numerical study on the nanofluid flows and temperature behaviors in the spirally coiled tubes with helical ribs |
| title_full | Numerical study on the nanofluid flows and temperature behaviors in the spirally coiled tubes with helical ribs |
| title_fullStr | Numerical study on the nanofluid flows and temperature behaviors in the spirally coiled tubes with helical ribs |
| title_full_unstemmed | Numerical study on the nanofluid flows and temperature behaviors in the spirally coiled tubes with helical ribs |
| title_short | Numerical study on the nanofluid flows and temperature behaviors in the spirally coiled tubes with helical ribs |
| title_sort | numerical study on the nanofluid flows and temperature behaviors in the spirally coiled tubes with helical ribs |
| topic | Swirling and secondary flows Nanofluids Spirally coiled tube Helical ribs Numerical study |
| url | http://www.sciencedirect.com/science/article/pii/S2214157X21003671 |
| work_keys_str_mv | AT pnaphon numericalstudyonthenanofluidflowsandtemperaturebehaviorsinthespirallycoiledtubeswithhelicalribs AT swiriyasart numericalstudyonthenanofluidflowsandtemperaturebehaviorsinthespirallycoiledtubeswithhelicalribs AT rprurapark numericalstudyonthenanofluidflowsandtemperaturebehaviorsinthespirallycoiledtubeswithhelicalribs AT asrichat numericalstudyonthenanofluidflowsandtemperaturebehaviorsinthespirallycoiledtubeswithhelicalribs |