Effects of different working gases on the heat transfer enhancement performance of a heating tube with spiral insert under oscillatory flow
The working gas type had an important effect on the heat transfer performance of the turbulence device in the heater of Stirling engine, but the related researches were scarce, especially under the oscillatory flow. This work investigated the effects of four working gases (i.e., H2, He, N2, and CO2)...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2023-08-01
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| Series: | Energy Reports |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S235248472300392X |
| _version_ | 1797740885918613504 |
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| author | Feng Xin Junying Zhang Yanfeng Yang Wenguang Cao Bin Zhao |
| author_facet | Feng Xin Junying Zhang Yanfeng Yang Wenguang Cao Bin Zhao |
| author_sort | Feng Xin |
| collection | DOAJ |
| description | The working gas type had an important effect on the heat transfer performance of the turbulence device in the heater of Stirling engine, but the related researches were scarce, especially under the oscillatory flow. This work investigated the effects of four working gases (i.e., H2, He, N2, and CO2) on the heat transfer characteristics of a heating tube with spiral insert compared with a smooth tube under oscillating flow for a Stirling engine. The transient physical fields under different phase angles in an oscillatory cycle were analyzed, and the Nusselt (Nu) number, pressure loss and outlet temperature of working gas were studied. The results show that the cycle average Nu number of the enhanced tube with H2, He, N2, and CO2 as working gas increased to 1.67, 1.62, 1.61 and 1.72 times when comparing with those of the smooth tube. The cycle average friction coefficient increased to 1.96, 2.37, 2.36 and 2.62 times, respectively. Moreover, the performance evaluation criterion (PEC) values of the enhanced tube using the four types of working gas were all greater than 1 (1.21∼1.33). This implies that the comprehensive heat transfer performance of the heating tube with spiral insert was all improved with the four types of working gas. Moreover, the heat transfer enhancement effect was best when hydrogen was used. While considering the thermodynamic performance and safety reliability, the helium was more recommended. The findings are beneficial to enhance the operating efficiency of a Stirling engine. |
| first_indexed | 2024-03-12T14:18:58Z |
| format | Article |
| id | doaj.art-e2ee69469a12405e87140072c1862aab |
| institution | Directory Open Access Journal |
| issn | 2352-4847 |
| language | English |
| last_indexed | 2024-03-12T14:18:58Z |
| publishDate | 2023-08-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Energy Reports |
| spelling | doaj.art-e2ee69469a12405e87140072c1862aab2023-08-20T04:38:08ZengElsevierEnergy Reports2352-48472023-08-019154162Effects of different working gases on the heat transfer enhancement performance of a heating tube with spiral insert under oscillatory flowFeng Xin0Junying Zhang1Yanfeng Yang2Wenguang Cao3Bin Zhao4School of Energy and Power Engineering, Changsha University of Science and Technology, Changsha 410114, ChinaSchool of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, ChinaSchool of Energy and Power Engineering, Changsha University of Science and Technology, Changsha 410114, ChinaSchool of Energy and Power Engineering, Changsha University of Science and Technology, Changsha 410114, ChinaSchool of Energy and Power Engineering, Changsha University of Science and Technology, Changsha 410114, China; Corresponding author.The working gas type had an important effect on the heat transfer performance of the turbulence device in the heater of Stirling engine, but the related researches were scarce, especially under the oscillatory flow. This work investigated the effects of four working gases (i.e., H2, He, N2, and CO2) on the heat transfer characteristics of a heating tube with spiral insert compared with a smooth tube under oscillating flow for a Stirling engine. The transient physical fields under different phase angles in an oscillatory cycle were analyzed, and the Nusselt (Nu) number, pressure loss and outlet temperature of working gas were studied. The results show that the cycle average Nu number of the enhanced tube with H2, He, N2, and CO2 as working gas increased to 1.67, 1.62, 1.61 and 1.72 times when comparing with those of the smooth tube. The cycle average friction coefficient increased to 1.96, 2.37, 2.36 and 2.62 times, respectively. Moreover, the performance evaluation criterion (PEC) values of the enhanced tube using the four types of working gas were all greater than 1 (1.21∼1.33). This implies that the comprehensive heat transfer performance of the heating tube with spiral insert was all improved with the four types of working gas. Moreover, the heat transfer enhancement effect was best when hydrogen was used. While considering the thermodynamic performance and safety reliability, the helium was more recommended. The findings are beneficial to enhance the operating efficiency of a Stirling engine.http://www.sciencedirect.com/science/article/pii/S235248472300392XWorking gasEnhancement of heat transferOscillating flowHeating tubeSpiral insert |
| spellingShingle | Feng Xin Junying Zhang Yanfeng Yang Wenguang Cao Bin Zhao Effects of different working gases on the heat transfer enhancement performance of a heating tube with spiral insert under oscillatory flow Energy Reports Working gas Enhancement of heat transfer Oscillating flow Heating tube Spiral insert |
| title | Effects of different working gases on the heat transfer enhancement performance of a heating tube with spiral insert under oscillatory flow |
| title_full | Effects of different working gases on the heat transfer enhancement performance of a heating tube with spiral insert under oscillatory flow |
| title_fullStr | Effects of different working gases on the heat transfer enhancement performance of a heating tube with spiral insert under oscillatory flow |
| title_full_unstemmed | Effects of different working gases on the heat transfer enhancement performance of a heating tube with spiral insert under oscillatory flow |
| title_short | Effects of different working gases on the heat transfer enhancement performance of a heating tube with spiral insert under oscillatory flow |
| title_sort | effects of different working gases on the heat transfer enhancement performance of a heating tube with spiral insert under oscillatory flow |
| topic | Working gas Enhancement of heat transfer Oscillating flow Heating tube Spiral insert |
| url | http://www.sciencedirect.com/science/article/pii/S235248472300392X |
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