Simulation of Vapor-Liquid Separation in the Orifice-Baffle Header under Various Operating Conditions
Vapor-liquid separation during condensation enables the enhancement of heat transfer coefficient and reduction in pressure drop simultaneously. The vapor-liquid separator is vital to the performance of such a liquid-separation condenser (LSC). It should fulfill the functions of allowing the condensa...
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MDPI AG
2022-08-01
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| author | Kunteng Huang Jianyong Chen Ying Chen Xianglong Luo Yingzong Liang Jiacheng He Zhi Yang |
| author_facet | Kunteng Huang Jianyong Chen Ying Chen Xianglong Luo Yingzong Liang Jiacheng He Zhi Yang |
| author_sort | Kunteng Huang |
| collection | DOAJ |
| description | Vapor-liquid separation during condensation enables the enhancement of heat transfer coefficient and reduction in pressure drop simultaneously. The vapor-liquid separator is vital to the performance of such a liquid-separation condenser (LSC). It should fulfill the functions of allowing the condensate to drain away as much as possible from the separator and leaving only vapor to continue condensing afterwards. However, due to the intensive interactions between the liquid and vapor, it is really hard to achieve perfect vapor-liquid separation, adding new uncertainties to the maldistributions in the branch outlets of a parallel condenser. To discover more insights of the flow conditions in the header and phase distributions, the characteristics of the orifice-baffle header are studied by using CFD and the mechanistic model for the droplet analysis is established by means of force balance in this paper. A parametrical analysis is carried out to discover the effects of operating conditions. It is found that the maximum vapor-liquid separation efficiency (<i>η</i>) is 51.94% as the inlet mass flow rate (<i>ṁ</i><sub>in</sub>) is 12 g/s. The vapor leakage from the orifice because of the liquid impact is one of the main reasons that deteriorate the vapor-liquid separation performance. Moreover, the vortex in the header increases the local mass flux, thereafter decreasing the droplet diameter. With the increasing of <i>ṁ</i><sub>in</sub>, the dominant force of the droplet in the vertical direction switches from <i>F</i><sub>G</sub> to <i>F</i><sub>D2</sub>. |
| first_indexed | 2024-03-09T11:57:43Z |
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| id | doaj.art-7fd96e3c6c584589b88231546b59ebb9 |
| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-03-09T11:57:43Z |
| publishDate | 2022-08-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Applied Sciences |
| spelling | doaj.art-7fd96e3c6c584589b88231546b59ebb92023-11-30T23:07:03ZengMDPI AGApplied Sciences2076-34172022-08-011216797110.3390/app12167971Simulation of Vapor-Liquid Separation in the Orifice-Baffle Header under Various Operating ConditionsKunteng Huang0Jianyong Chen1Ying Chen2Xianglong Luo3Yingzong Liang4Jiacheng He5Zhi Yang6School of Material and Energy, Guangdong University of Technology, Guangzhou 510006, ChinaSchool of Material and Energy, Guangdong University of Technology, Guangzhou 510006, ChinaSchool of Material and Energy, Guangdong University of Technology, Guangzhou 510006, ChinaSchool of Material and Energy, Guangdong University of Technology, Guangzhou 510006, ChinaSchool of Material and Energy, Guangdong University of Technology, Guangzhou 510006, ChinaSchool of Material and Energy, Guangdong University of Technology, Guangzhou 510006, ChinaSchool of Material and Energy, Guangdong University of Technology, Guangzhou 510006, ChinaVapor-liquid separation during condensation enables the enhancement of heat transfer coefficient and reduction in pressure drop simultaneously. The vapor-liquid separator is vital to the performance of such a liquid-separation condenser (LSC). It should fulfill the functions of allowing the condensate to drain away as much as possible from the separator and leaving only vapor to continue condensing afterwards. However, due to the intensive interactions between the liquid and vapor, it is really hard to achieve perfect vapor-liquid separation, adding new uncertainties to the maldistributions in the branch outlets of a parallel condenser. To discover more insights of the flow conditions in the header and phase distributions, the characteristics of the orifice-baffle header are studied by using CFD and the mechanistic model for the droplet analysis is established by means of force balance in this paper. A parametrical analysis is carried out to discover the effects of operating conditions. It is found that the maximum vapor-liquid separation efficiency (<i>η</i>) is 51.94% as the inlet mass flow rate (<i>ṁ</i><sub>in</sub>) is 12 g/s. The vapor leakage from the orifice because of the liquid impact is one of the main reasons that deteriorate the vapor-liquid separation performance. Moreover, the vortex in the header increases the local mass flux, thereafter decreasing the droplet diameter. With the increasing of <i>ṁ</i><sub>in</sub>, the dominant force of the droplet in the vertical direction switches from <i>F</i><sub>G</sub> to <i>F</i><sub>D2</sub>.https://www.mdpi.com/2076-3417/12/16/7971condenservapor-liquid separationsimulationseparation efficiency |
| spellingShingle | Kunteng Huang Jianyong Chen Ying Chen Xianglong Luo Yingzong Liang Jiacheng He Zhi Yang Simulation of Vapor-Liquid Separation in the Orifice-Baffle Header under Various Operating Conditions Applied Sciences condenser vapor-liquid separation simulation separation efficiency |
| title | Simulation of Vapor-Liquid Separation in the Orifice-Baffle Header under Various Operating Conditions |
| title_full | Simulation of Vapor-Liquid Separation in the Orifice-Baffle Header under Various Operating Conditions |
| title_fullStr | Simulation of Vapor-Liquid Separation in the Orifice-Baffle Header under Various Operating Conditions |
| title_full_unstemmed | Simulation of Vapor-Liquid Separation in the Orifice-Baffle Header under Various Operating Conditions |
| title_short | Simulation of Vapor-Liquid Separation in the Orifice-Baffle Header under Various Operating Conditions |
| title_sort | simulation of vapor liquid separation in the orifice baffle header under various operating conditions |
| topic | condenser vapor-liquid separation simulation separation efficiency |
| url | https://www.mdpi.com/2076-3417/12/16/7971 |
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