Two-Phase Annular Flow in Vertical Pipes: A Critical Review of Current Research Techniques and Progress
Two-phase annular flow in vertical pipes is one of the most common and important flow regimes in fluid mechanics, particularly in the field of building drainage systems where discharges to the vertical pipe are random and the flow is unsteady. With the development of experimental techniques and anal...
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-11-01
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| Series: | Water |
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| Online Access: | https://www.mdpi.com/2073-4441/14/21/3496 |
| _version_ | 1797466256184442880 |
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| author | Yunpeng Xue Colin Stewart David Kelly David Campbell Michael Gormley |
| author_facet | Yunpeng Xue Colin Stewart David Kelly David Campbell Michael Gormley |
| author_sort | Yunpeng Xue |
| collection | DOAJ |
| description | Two-phase annular flow in vertical pipes is one of the most common and important flow regimes in fluid mechanics, particularly in the field of building drainage systems where discharges to the vertical pipe are random and the flow is unsteady. With the development of experimental techniques and analytical methods, the understanding of the fundamental mechanism of the annular two-phase flow has been significantly advanced, such as liquid film development, evolution of the disturbance wave, and droplet entrainment mechanism. Despite the hundreds of papers published so far, the mechanism of annular flow remains incompletely understood. Therefore, this paper summarizes the research on two-phase annular flow in vertical pipes mainly in the last two decades. The review is mainly divided into two parts, i.e., the investigation methodologies and the advancement of knowledge. Different experimental techniques and numerical simulations are compared to highlight their advantages and challenges. Advanced underpinning physics of the mechanism is summarized in several groups including the wavy liquid film, droplet behaviour, entrainment and void fraction. Challenges and recommendations are summarized based on the literature cited in this review. |
| first_indexed | 2024-03-09T18:33:13Z |
| format | Article |
| id | doaj.art-694ea7c25c1a4e68835c9ff81f434cb8 |
| institution | Directory Open Access Journal |
| issn | 2073-4441 |
| language | English |
| last_indexed | 2024-03-09T18:33:13Z |
| publishDate | 2022-11-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Water |
| spelling | doaj.art-694ea7c25c1a4e68835c9ff81f434cb82023-11-24T07:20:22ZengMDPI AGWater2073-44412022-11-011421349610.3390/w14213496Two-Phase Annular Flow in Vertical Pipes: A Critical Review of Current Research Techniques and ProgressYunpeng Xue0Colin Stewart1David Kelly2David Campbell3Michael Gormley4Singapore-ETH Centre, Future Resilient Systems, ETH Zurich, CREATE Campus, 1 CREATE Way, #06-01 CREATE Tower, Singapore 138602, SingaporeInstitute for Sustainable Building Design, Heriot-Watt University, Edinburgh EH14 4AS, UKInstitute for Sustainable Building Design, Heriot-Watt University, Edinburgh EH14 4AS, UKInstitute for Sustainable Building Design, Heriot-Watt University, Edinburgh EH14 4AS, UKInstitute for Sustainable Building Design, Heriot-Watt University, Edinburgh EH14 4AS, UKTwo-phase annular flow in vertical pipes is one of the most common and important flow regimes in fluid mechanics, particularly in the field of building drainage systems where discharges to the vertical pipe are random and the flow is unsteady. With the development of experimental techniques and analytical methods, the understanding of the fundamental mechanism of the annular two-phase flow has been significantly advanced, such as liquid film development, evolution of the disturbance wave, and droplet entrainment mechanism. Despite the hundreds of papers published so far, the mechanism of annular flow remains incompletely understood. Therefore, this paper summarizes the research on two-phase annular flow in vertical pipes mainly in the last two decades. The review is mainly divided into two parts, i.e., the investigation methodologies and the advancement of knowledge. Different experimental techniques and numerical simulations are compared to highlight their advantages and challenges. Advanced underpinning physics of the mechanism is summarized in several groups including the wavy liquid film, droplet behaviour, entrainment and void fraction. Challenges and recommendations are summarized based on the literature cited in this review.https://www.mdpi.com/2073-4441/14/21/3496two-phase flowannular flowexperimental techniquesannular pipe flowbuilding drainage |
| spellingShingle | Yunpeng Xue Colin Stewart David Kelly David Campbell Michael Gormley Two-Phase Annular Flow in Vertical Pipes: A Critical Review of Current Research Techniques and Progress Water two-phase flow annular flow experimental techniques annular pipe flow building drainage |
| title | Two-Phase Annular Flow in Vertical Pipes: A Critical Review of Current Research Techniques and Progress |
| title_full | Two-Phase Annular Flow in Vertical Pipes: A Critical Review of Current Research Techniques and Progress |
| title_fullStr | Two-Phase Annular Flow in Vertical Pipes: A Critical Review of Current Research Techniques and Progress |
| title_full_unstemmed | Two-Phase Annular Flow in Vertical Pipes: A Critical Review of Current Research Techniques and Progress |
| title_short | Two-Phase Annular Flow in Vertical Pipes: A Critical Review of Current Research Techniques and Progress |
| title_sort | two phase annular flow in vertical pipes a critical review of current research techniques and progress |
| topic | two-phase flow annular flow experimental techniques annular pipe flow building drainage |
| url | https://www.mdpi.com/2073-4441/14/21/3496 |
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