Analysis of heat transfer mechanism in supercritical fluids from the aspect of pool heating
For the special phenomena of heat transfer deterioration or enhancement in supercritical fluid heat transfer, existing research still presents inconsistent opinions. In this study, we perform an analysis of the property changes, and present new understandings for pseudo-boiling theory. More importan...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Frontiers Media S.A.
2023-01-01
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| Series: | Frontiers in Energy Research |
| Subjects: | |
| Online Access: | https://www.frontiersin.org/articles/10.3389/fenrg.2022.1042391/full |
| _version_ | 1797954117113479168 |
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| author | Minyun Liu Minyun Liu Shenghui Liu Dapeng Xi Shanfang Huang Yanping Huang |
| author_facet | Minyun Liu Minyun Liu Shenghui Liu Dapeng Xi Shanfang Huang Yanping Huang |
| author_sort | Minyun Liu |
| collection | DOAJ |
| description | For the special phenomena of heat transfer deterioration or enhancement in supercritical fluid heat transfer, existing research still presents inconsistent opinions. In this study, we perform an analysis of the property changes, and present new understandings for pseudo-boiling theory. More importantly, essential differences between subcritical boiling and supercritical pseudo-boiling are highlighted; the critical factors being thermodynamic instability and stability. For isothermal heating cases, pseudo film boiling can be regarded as an extension of near-critical boiling. Moreover, pseudo nucleate boiling only appears in non-isothermal heating cases and is strongly dependent on the heater geometry, materials, etc. A coupled level-set and volume-of-fluid method is used to simulate the near-critical film boiling of carbon dioxide at pressures of 7.0 and 7.37 MPa. In comparison, supercritical cases at a pressure of 7.5 MPa are the natural convections of single-phase fluid with variable physical properties. The numerical results indicate the similar motions of low-density fluids in subcritical and supercritical cases. All results are consistent with prior experiments, providing a better understanding of the special features of supercritical fluid heat transfer. |
| first_indexed | 2024-04-10T23:12:33Z |
| format | Article |
| id | doaj.art-a551af461dbd43e0bfcdcaaf1564f277 |
| institution | Directory Open Access Journal |
| issn | 2296-598X |
| language | English |
| last_indexed | 2024-04-10T23:12:33Z |
| publishDate | 2023-01-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Energy Research |
| spelling | doaj.art-a551af461dbd43e0bfcdcaaf1564f2772023-01-13T04:26:18ZengFrontiers Media S.A.Frontiers in Energy Research2296-598X2023-01-011010.3389/fenrg.2022.10423911042391Analysis of heat transfer mechanism in supercritical fluids from the aspect of pool heatingMinyun Liu0Minyun Liu1Shenghui Liu2Dapeng Xi3Shanfang Huang4Yanping Huang5CNNC Key Laboratory on Nuclear Reactor Thermal Hydraulics Technology, Nuclear Power Institute of China, Chengdu, ChinaDepartment of Engineering Physics, Tsinghua University, Beijing, ChinaKey Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing, ChinaCNNC Key Laboratory on Nuclear Reactor Thermal Hydraulics Technology, Nuclear Power Institute of China, Chengdu, ChinaDepartment of Engineering Physics, Tsinghua University, Beijing, ChinaCNNC Key Laboratory on Nuclear Reactor Thermal Hydraulics Technology, Nuclear Power Institute of China, Chengdu, ChinaFor the special phenomena of heat transfer deterioration or enhancement in supercritical fluid heat transfer, existing research still presents inconsistent opinions. In this study, we perform an analysis of the property changes, and present new understandings for pseudo-boiling theory. More importantly, essential differences between subcritical boiling and supercritical pseudo-boiling are highlighted; the critical factors being thermodynamic instability and stability. For isothermal heating cases, pseudo film boiling can be regarded as an extension of near-critical boiling. Moreover, pseudo nucleate boiling only appears in non-isothermal heating cases and is strongly dependent on the heater geometry, materials, etc. A coupled level-set and volume-of-fluid method is used to simulate the near-critical film boiling of carbon dioxide at pressures of 7.0 and 7.37 MPa. In comparison, supercritical cases at a pressure of 7.5 MPa are the natural convections of single-phase fluid with variable physical properties. The numerical results indicate the similar motions of low-density fluids in subcritical and supercritical cases. All results are consistent with prior experiments, providing a better understanding of the special features of supercritical fluid heat transfer.https://www.frontiersin.org/articles/10.3389/fenrg.2022.1042391/fullsupercritical fluidspseudo-boilingboilingnatural convectionheat transfer |
| spellingShingle | Minyun Liu Minyun Liu Shenghui Liu Dapeng Xi Shanfang Huang Yanping Huang Analysis of heat transfer mechanism in supercritical fluids from the aspect of pool heating Frontiers in Energy Research supercritical fluids pseudo-boiling boiling natural convection heat transfer |
| title | Analysis of heat transfer mechanism in supercritical fluids from the aspect of pool heating |
| title_full | Analysis of heat transfer mechanism in supercritical fluids from the aspect of pool heating |
| title_fullStr | Analysis of heat transfer mechanism in supercritical fluids from the aspect of pool heating |
| title_full_unstemmed | Analysis of heat transfer mechanism in supercritical fluids from the aspect of pool heating |
| title_short | Analysis of heat transfer mechanism in supercritical fluids from the aspect of pool heating |
| title_sort | analysis of heat transfer mechanism in supercritical fluids from the aspect of pool heating |
| topic | supercritical fluids pseudo-boiling boiling natural convection heat transfer |
| url | https://www.frontiersin.org/articles/10.3389/fenrg.2022.1042391/full |
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