Vertically distributed wall sources of buoyancy. Part 1. Unconfined.
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| Title: | Vertically distributed wall sources of buoyancy. Part 1. Unconfined. |
|---|---|
| Authors: | Parker, D. A.1 (AUTHOR), Burridge, H. C.2 (AUTHOR) h.burridge@imperial.ac.uk, Partridge, J. L.1 (AUTHOR), Linden, P. F.1 (AUTHOR) |
| Source: | Journal of Fluid Mechanics. 1/25/2021, Vol. 907, p1-26. 26p. |
| Subjects: | Plumes (Fluid dynamics), Buoyancy-driven flow, Buoyancy, Turbulent boundary layer, Saline waters, Solution (Chemistry) |
| Abstract: | We examine a turbulent distributed wall-source plume: the flow resulting from a uniform vertical wall source of buoyancy such as that produced by an evenly heated or cooled vertical wall. The vertically distributed buoyancy source is created by forcing dense salt water solution through a porous wall. Velocity measurements on a vertical plane normal to the wall are first presented examining the full height of the wall in order to identify the region in which the bulk flow has become fully turbulent, self-similar and reached an invariant balance between the fluxes of volume, momentum and buoyancy. Simultaneous velocity and buoyancy field measurements are then presented in this region and an entrainment coefficient of $\alpha = 0.068 \pm 0.006$ is determined. This value is small compared to that of buoyancy-driven unbounded flows, e.g. a free line plume, and we reason this to be due to the presence of a rigid boundary restricting meandering and turbulence production, rather than the effect of the vertically distributed source of buoyancy. Turbulent velocity and buoyancy statistics are presented and, in order to gain physical insights into the flow behaviour, the results are compared to those of other canonical buoyancy-driven free and wall-bounded flows. We show that the bulk mixing of distributed wall-source plumes can be captured by consideration of the characteristic vertical velocities and a constant entrainment coefficient. This mixing is inhibited both by the presence of a rigid boundary and the reduced characteristic velocities (compared to those of wall line plumes). [ABSTRACT FROM AUTHOR] |
| Copyright of Journal of Fluid Mechanics is the property of Cambridge University Press 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.) | |
| Database: | Engineering Source |
| FullText | Text: Availability: 0 |
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| Header | DbId: egs DbLabel: Engineering Source An: 147715909 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Vertically distributed wall sources of buoyancy. Part 1. Unconfined. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Parker%2C+D%2E+A%2E%22">Parker, D. A.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Burridge%2C+H%2E+C%2E%22">Burridge, H. C.</searchLink><relatesTo>2</relatesTo> (AUTHOR)<i> h.burridge@imperial.ac.uk</i><br /><searchLink fieldCode="AR" term="%22Partridge%2C+J%2E+L%2E%22">Partridge, J. L.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Linden%2C+P%2E+F%2E%22">Linden, P. F.</searchLink><relatesTo>1</relatesTo> (AUTHOR) – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Journal+of+Fluid+Mechanics%22">Journal of Fluid Mechanics</searchLink>. 1/25/2021, Vol. 907, p1-26. 26p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Plumes+%28Fluid+dynamics%29%22">Plumes (Fluid dynamics)</searchLink><br /><searchLink fieldCode="DE" term="%22Buoyancy-driven+flow%22">Buoyancy-driven flow</searchLink><br /><searchLink fieldCode="DE" term="%22Buoyancy%22">Buoyancy</searchLink><br /><searchLink fieldCode="DE" term="%22Turbulent+boundary+layer%22">Turbulent boundary layer</searchLink><br /><searchLink fieldCode="DE" term="%22Saline+waters%22">Saline waters</searchLink><br /><searchLink fieldCode="DE" term="%22Solution+%28Chemistry%29%22">Solution (Chemistry)</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: We examine a turbulent distributed wall-source plume: the flow resulting from a uniform vertical wall source of buoyancy such as that produced by an evenly heated or cooled vertical wall. The vertically distributed buoyancy source is created by forcing dense salt water solution through a porous wall. Velocity measurements on a vertical plane normal to the wall are first presented examining the full height of the wall in order to identify the region in which the bulk flow has become fully turbulent, self-similar and reached an invariant balance between the fluxes of volume, momentum and buoyancy. Simultaneous velocity and buoyancy field measurements are then presented in this region and an entrainment coefficient of $\alpha = 0.068 \pm 0.006$ is determined. This value is small compared to that of buoyancy-driven unbounded flows, e.g. a free line plume, and we reason this to be due to the presence of a rigid boundary restricting meandering and turbulence production, rather than the effect of the vertically distributed source of buoyancy. Turbulent velocity and buoyancy statistics are presented and, in order to gain physical insights into the flow behaviour, the results are compared to those of other canonical buoyancy-driven free and wall-bounded flows. We show that the bulk mixing of distributed wall-source plumes can be captured by consideration of the characteristic vertical velocities and a constant entrainment coefficient. This mixing is inhibited both by the presence of a rigid boundary and the reduced characteristic velocities (compared to those of wall line plumes). [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Journal of Fluid Mechanics is the property of Cambridge University Press 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: 10.1017/jfm.2020.808 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 26 StartPage: 1 Subjects: – SubjectFull: Plumes (Fluid dynamics) Type: general – SubjectFull: Buoyancy-driven flow Type: general – SubjectFull: Buoyancy Type: general – SubjectFull: Turbulent boundary layer Type: general – SubjectFull: Saline waters Type: general – SubjectFull: Solution (Chemistry) Type: general Titles: – TitleFull: Vertically distributed wall sources of buoyancy. Part 1. Unconfined. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Parker, D. A. – PersonEntity: Name: NameFull: Burridge, H. C. – PersonEntity: Name: NameFull: Partridge, J. L. – PersonEntity: Name: NameFull: Linden, P. F. IsPartOfRelationships: – BibEntity: Dates: – D: 25 M: 01 Text: 1/25/2021 Type: published Y: 2021 Identifiers: – Type: issn-print Value: 00221120 Numbering: – Type: volume Value: 907 Titles: – TitleFull: Journal of Fluid Mechanics Type: main |
| ResultId | 1 |
