Experimental Investigation on Air-Water Two-Phase Flow Pattern and Pressure Drop in Vertical Upward Annulus.
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| Title: | Experimental Investigation on Air-Water Two-Phase Flow Pattern and Pressure Drop in Vertical Upward Annulus. |
|---|---|
| Authors: | Li, Nailiang1 (AUTHOR), Liu, Changsong1 (AUTHOR), Peng, Xurui1 (AUTHOR), Du, Xueping1 (AUTHOR) xpdcumt@cumt.edu.cn |
| Source: | Heat Transfer Engineering. 2025, Vol. 46 Issue 13/14, p1286-1301. 16p. |
| Subjects: | Flow separation, Transition flow, Two-phase flow, Texture mapping, Databases |
| Abstract: | In the present work, air-water two-phase flow pattern and pressure drop in vertical upward annular channel with different diameters are experimentally studied. Two concentric annular test sections with the same hydraulic diameter of 4.6 mm are used in the experiments. The outer diameter and inner diameter corresponding to the two test sections are 18.60 and 12.30, and 86.75 and 80.45, respectively. Bubble flow, cap-slug flow, cap-churn flow, and annular flow were found in both the test sections and the flow pattern map is developed. It is found that the superficial gas velocity has an important effect on the transition of the flow patterns. Pressure drop correlations are reviewed and a total of 12 correlations are collected, including 4 homogeneous flow model (HFM)-based correlations and 8 separated flow model-based correlations. The existing correlations for estimating pressure drop were tested against the measured data. The comparisons show that no correlation studied here provides satisfactory agreement with the whole database. The Chisholm correlation provides the best accuracy with 20.9% for the small test section and 21.5% for large test section. It is also found that the existing models based on separated flow method predict frictional pressure drop with higher accuracy than those based on HFM. The result of this study highlights the requirement of a new method for calculating the frictional pressure drop in annular channels. [ABSTRACT FROM AUTHOR] |
| Copyright of Heat Transfer Engineering is the property of Taylor & Francis Ltd and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
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| Header | DbId: egs DbLabel: Engineering Source An: 185818060 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Experimental Investigation on Air-Water Two-Phase Flow Pattern and Pressure Drop in Vertical Upward Annulus. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Li%2C+Nailiang%22">Li, Nailiang</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Liu%2C+Changsong%22">Liu, Changsong</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Peng%2C+Xurui%22">Peng, Xurui</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Du%2C+Xueping%22">Du, Xueping</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> xpdcumt@cumt.edu.cn</i> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Heat+Transfer+Engineering%22">Heat Transfer Engineering</searchLink>. 2025, Vol. 46 Issue 13/14, p1286-1301. 16p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Flow+separation%22">Flow separation</searchLink><br /><searchLink fieldCode="DE" term="%22Transition+flow%22">Transition flow</searchLink><br /><searchLink fieldCode="DE" term="%22Two-phase+flow%22">Two-phase flow</searchLink><br /><searchLink fieldCode="DE" term="%22Texture+mapping%22">Texture mapping</searchLink><br /><searchLink fieldCode="DE" term="%22Databases%22">Databases</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: In the present work, air-water two-phase flow pattern and pressure drop in vertical upward annular channel with different diameters are experimentally studied. Two concentric annular test sections with the same hydraulic diameter of 4.6 mm are used in the experiments. The outer diameter and inner diameter corresponding to the two test sections are 18.60 and 12.30, and 86.75 and 80.45, respectively. Bubble flow, cap-slug flow, cap-churn flow, and annular flow were found in both the test sections and the flow pattern map is developed. It is found that the superficial gas velocity has an important effect on the transition of the flow patterns. Pressure drop correlations are reviewed and a total of 12 correlations are collected, including 4 homogeneous flow model (HFM)-based correlations and 8 separated flow model-based correlations. The existing correlations for estimating pressure drop were tested against the measured data. The comparisons show that no correlation studied here provides satisfactory agreement with the whole database. The Chisholm correlation provides the best accuracy with 20.9% for the small test section and 21.5% for large test section. It is also found that the existing models based on separated flow method predict frictional pressure drop with higher accuracy than those based on HFM. The result of this study highlights the requirement of a new method for calculating the frictional pressure drop in annular channels. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Heat Transfer Engineering is the property of Taylor & Francis Ltd and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1080/01457632.2024.2368432 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 16 StartPage: 1286 Subjects: – SubjectFull: Flow separation Type: general – SubjectFull: Transition flow Type: general – SubjectFull: Two-phase flow Type: general – SubjectFull: Texture mapping Type: general – SubjectFull: Databases Type: general Titles: – TitleFull: Experimental Investigation on Air-Water Two-Phase Flow Pattern and Pressure Drop in Vertical Upward Annulus. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Li, Nailiang – PersonEntity: Name: NameFull: Liu, Changsong – PersonEntity: Name: NameFull: Peng, Xurui – PersonEntity: Name: NameFull: Du, Xueping IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 08 Text: 2025 Type: published Y: 2025 Identifiers: – Type: issn-print Value: 01457632 Numbering: – Type: volume Value: 46 – Type: issue Value: 13/14 Titles: – TitleFull: Heat Transfer Engineering Type: main |
| ResultId | 1 |
