Numerical Simulation Method for Flash Evaporation with Circulating Water Based on a Modified Lee Model
Flash evaporation processes are widely adopted in the desalination, food processing, waste heat recovery and other industries for heat extraction or product separation. In this paper, a pressure-driven phase transition model is developed by improving the Lee model and combined with the VOF (Volume o...
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| Format: | Article |
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MDPI AG
2023-11-01
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| Series: | Energies |
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| Online Access: | https://www.mdpi.com/1996-1073/16/21/7453 |
| _version_ | 1797631935158157312 |
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| author | Bingrui Li Xin Wang Yameng Man Bingxi Li Wei Wang |
| author_facet | Bingrui Li Xin Wang Yameng Man Bingxi Li Wei Wang |
| author_sort | Bingrui Li |
| collection | DOAJ |
| description | Flash evaporation processes are widely adopted in the desalination, food processing, waste heat recovery and other industries for heat extraction or product separation. In this paper, a pressure-driven phase transition model is developed by improving the Lee model and combined with the VOF (Volume of Fluid) method to numerically simulate the flash evaporation process. In this modified Lee phase transition model, the driving force for the rates of the local phase transition is calculated using the local temperature and static pressure magnitude. Numerical simulations are carried out in a water-circulating flash chamber and compared with the experimental results to obtain the values of the time relaxation parameters. And the non-equilibrium fraction of the outlet water can be effectively obtained under different conditions of flow rate, inlet temperature and initial liquid level height. The time relaxation factor takes values from 0.195 to 0.43 (<i>P</i><sub>out,v</sub> = 19.9 kPa) and from 0.31 to 0.92 (<i>P</i><sub>out,v</sub> = 31.2 kPa) with increasing superheat. In addition, the model can effectively represent the evolution of the unstable flow flash evaporation from the initial rapid boiling state to dynamic equilibrium. |
| first_indexed | 2024-03-11T11:30:43Z |
| format | Article |
| id | doaj.art-68f451b2f9044e02a785bfe4e0075c7c |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-03-11T11:30:43Z |
| publishDate | 2023-11-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj.art-68f451b2f9044e02a785bfe4e0075c7c2023-11-10T15:02:35ZengMDPI AGEnergies1996-10732023-11-011621745310.3390/en16217453Numerical Simulation Method for Flash Evaporation with Circulating Water Based on a Modified Lee ModelBingrui Li0Xin Wang1Yameng Man2Bingxi Li3Wei Wang4School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, ChinaSchool of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, ChinaSchool of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, ChinaSchool of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, ChinaSchool of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, ChinaFlash evaporation processes are widely adopted in the desalination, food processing, waste heat recovery and other industries for heat extraction or product separation. In this paper, a pressure-driven phase transition model is developed by improving the Lee model and combined with the VOF (Volume of Fluid) method to numerically simulate the flash evaporation process. In this modified Lee phase transition model, the driving force for the rates of the local phase transition is calculated using the local temperature and static pressure magnitude. Numerical simulations are carried out in a water-circulating flash chamber and compared with the experimental results to obtain the values of the time relaxation parameters. And the non-equilibrium fraction of the outlet water can be effectively obtained under different conditions of flow rate, inlet temperature and initial liquid level height. The time relaxation factor takes values from 0.195 to 0.43 (<i>P</i><sub>out,v</sub> = 19.9 kPa) and from 0.31 to 0.92 (<i>P</i><sub>out,v</sub> = 31.2 kPa) with increasing superheat. In addition, the model can effectively represent the evolution of the unstable flow flash evaporation from the initial rapid boiling state to dynamic equilibrium.https://www.mdpi.com/1996-1073/16/21/7453flash evaporationnumerical investigationmodified Lee modeltime relaxation parameters |
| spellingShingle | Bingrui Li Xin Wang Yameng Man Bingxi Li Wei Wang Numerical Simulation Method for Flash Evaporation with Circulating Water Based on a Modified Lee Model Energies flash evaporation numerical investigation modified Lee model time relaxation parameters |
| title | Numerical Simulation Method for Flash Evaporation with Circulating Water Based on a Modified Lee Model |
| title_full | Numerical Simulation Method for Flash Evaporation with Circulating Water Based on a Modified Lee Model |
| title_fullStr | Numerical Simulation Method for Flash Evaporation with Circulating Water Based on a Modified Lee Model |
| title_full_unstemmed | Numerical Simulation Method for Flash Evaporation with Circulating Water Based on a Modified Lee Model |
| title_short | Numerical Simulation Method for Flash Evaporation with Circulating Water Based on a Modified Lee Model |
| title_sort | numerical simulation method for flash evaporation with circulating water based on a modified lee model |
| topic | flash evaporation numerical investigation modified Lee model time relaxation parameters |
| url | https://www.mdpi.com/1996-1073/16/21/7453 |
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