Flow Symmetry and Heat Transfer Characteristics of Winglet Vortex Generators Arranged in Common Flow up Configuration
The generation of longitudinal vortices is an effective method for promoting thermal performance with a relative low-pressure penalty in heat exchangers. The winglet pair can generate symmetrical longitudinal vortices on the cross-section of the channel. The heat transfer and pressure-loss character...
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| Format: | Article |
| Language: | English |
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MDPI AG
2020-02-01
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| Series: | Symmetry |
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| Online Access: | https://www.mdpi.com/2073-8994/12/2/247 |
| _version_ | 1798003651148513280 |
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| author | Kewei Song Lu Wang Yajun Hu Qi Liu |
| author_facet | Kewei Song Lu Wang Yajun Hu Qi Liu |
| author_sort | Kewei Song |
| collection | DOAJ |
| description | The generation of longitudinal vortices is an effective method for promoting thermal performance with a relative low-pressure penalty in heat exchangers. The winglet pair can generate symmetrical longitudinal vortices on the cross-section of the channel. The heat transfer and pressure-loss characteristics of a pair of winglet vortex generators with different transverse pitches are numerically studied in this paper. The winglet pair arranged in a common flow up configuration generates a pair of symmetrical longitudinal main vortices with counter-rotating directions. The symmetrical flow structure induces fluid to flow from the bottom towards the top of the channel in the common flow region between the longitudinal vortices. The flow symmetry of the longitudinal vortices and the heat transfer performance are strongly affected by the transverse pitch of the winglet pair owing to the interaction between the longitudinal vortices. The optimal transverse pitch of the studied winglet pair with the best thermal performance is reported. The increments in the vortex intensity and the Nusselt number for the optimal pitch are increased by up to 21.4% and 29.2%, respectively. |
| first_indexed | 2024-04-11T12:11:09Z |
| format | Article |
| id | doaj.art-eb3c3b235892487798e6882b2503309b |
| institution | Directory Open Access Journal |
| issn | 2073-8994 |
| language | English |
| last_indexed | 2024-04-11T12:11:09Z |
| publishDate | 2020-02-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Symmetry |
| spelling | doaj.art-eb3c3b235892487798e6882b2503309b2022-12-22T04:24:36ZengMDPI AGSymmetry2073-89942020-02-0112224710.3390/sym12020247sym12020247Flow Symmetry and Heat Transfer Characteristics of Winglet Vortex Generators Arranged in Common Flow up ConfigurationKewei Song0Lu Wang1Yajun Hu2Qi Liu3School of Mechanical Engineering, Key Laboratory of Railway Vehicle Thermal Engineering of Ministry of Education of China, Lanzhou Jiaotong University, Lanzhou 730070, ChinaSchool of Mechanical Engineering, Key Laboratory of Railway Vehicle Thermal Engineering of Ministry of Education of China, Lanzhou Jiaotong University, Lanzhou 730070, ChinaSchool of Mechanical Engineering, Key Laboratory of Railway Vehicle Thermal Engineering of Ministry of Education of China, Lanzhou Jiaotong University, Lanzhou 730070, ChinaSchool of Mechanical Engineering, Key Laboratory of Railway Vehicle Thermal Engineering of Ministry of Education of China, Lanzhou Jiaotong University, Lanzhou 730070, ChinaThe generation of longitudinal vortices is an effective method for promoting thermal performance with a relative low-pressure penalty in heat exchangers. The winglet pair can generate symmetrical longitudinal vortices on the cross-section of the channel. The heat transfer and pressure-loss characteristics of a pair of winglet vortex generators with different transverse pitches are numerically studied in this paper. The winglet pair arranged in a common flow up configuration generates a pair of symmetrical longitudinal main vortices with counter-rotating directions. The symmetrical flow structure induces fluid to flow from the bottom towards the top of the channel in the common flow region between the longitudinal vortices. The flow symmetry of the longitudinal vortices and the heat transfer performance are strongly affected by the transverse pitch of the winglet pair owing to the interaction between the longitudinal vortices. The optimal transverse pitch of the studied winglet pair with the best thermal performance is reported. The increments in the vortex intensity and the Nusselt number for the optimal pitch are increased by up to 21.4% and 29.2%, respectively.https://www.mdpi.com/2073-8994/12/2/247winglet paircommon flow upvortex interactionflow symmetrythermal performance |
| spellingShingle | Kewei Song Lu Wang Yajun Hu Qi Liu Flow Symmetry and Heat Transfer Characteristics of Winglet Vortex Generators Arranged in Common Flow up Configuration Symmetry winglet pair common flow up vortex interaction flow symmetry thermal performance |
| title | Flow Symmetry and Heat Transfer Characteristics of Winglet Vortex Generators Arranged in Common Flow up Configuration |
| title_full | Flow Symmetry and Heat Transfer Characteristics of Winglet Vortex Generators Arranged in Common Flow up Configuration |
| title_fullStr | Flow Symmetry and Heat Transfer Characteristics of Winglet Vortex Generators Arranged in Common Flow up Configuration |
| title_full_unstemmed | Flow Symmetry and Heat Transfer Characteristics of Winglet Vortex Generators Arranged in Common Flow up Configuration |
| title_short | Flow Symmetry and Heat Transfer Characteristics of Winglet Vortex Generators Arranged in Common Flow up Configuration |
| title_sort | flow symmetry and heat transfer characteristics of winglet vortex generators arranged in common flow up configuration |
| topic | winglet pair common flow up vortex interaction flow symmetry thermal performance |
| url | https://www.mdpi.com/2073-8994/12/2/247 |
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