A comparison of entrainment in turbulent line plumes adjacent to and distant from a vertical wall.
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| Title: | A comparison of entrainment in turbulent line plumes adjacent to and distant from a vertical wall. |
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| Authors: | Parker, D. A.1 (AUTHOR) dap58@cam.ac.uk, Burridge, H. C.2 (AUTHOR), Partridge, J. L.1 (AUTHOR), Linden, P. F.1 (AUTHOR) |
| Source: | Journal of Fluid Mechanics. 1/10/2020, Vol. 882, p1-36. 36p. 2 Diagrams, 7 Charts, 18 Graphs. |
| Abstract: | We present simultaneous two-dimensional measurements of the velocity and buoyancy fields on a central vertical plane in two-dimensional line plumes: a free plume distant from vertical boundaries and a wall plume, adjacent to a vertical wall. Data are presented in both an Eulerian and a plume coordinate system that follow the instantaneous turbulent/non-turbulent interface (TNTI) of the plume. We present measurements in both coordinate systems and compare the entrainment in the two flows. We find that the value of the entrainment coefficient in the wall plume is greater than half that of the free plume. The reduction in entrainment is investigated by considering a decomposition of the entrainment coefficient based on the mean kinetic energy where the relative contributions of turbulent production, buoyancy and viscous terms are calculated. The reduced entrainment is also investigated by considering the statistics of the TNTI and the conditional vertical transport of the ambient and engulfed fluid. We show that the wall shear stress is non-negligible and that the free plume exhibits significant meandering. The effect of the meandering on the entrainment process is quantified in terms of the stretching of the TNTI where it is shown that the length of the TNTI is greater in the free plume and, further, the relative vertical transport of the engulfed ambient fluid is observed to be 15 % greater in the free plume. Finally, the turbulent velocity and buoyancy fluctuations, Reynolds stresses and the turbulent buoyancy fluxes are presented in both coordinate systems. [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: 187730004 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: A comparison of entrainment in turbulent line plumes adjacent to and distant from a vertical wall. – 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)<i> dap58@cam.ac.uk</i><br /><searchLink fieldCode="AR" term="%22Burridge%2C+H%2E+C%2E%22">Burridge, H. C.</searchLink><relatesTo>2</relatesTo> (AUTHOR)<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>. 1/10/2020, Vol. 882, p1-36. 36p. 2 Diagrams, 7 Charts, 18 Graphs. – Name: Abstract Label: Abstract Group: Ab Data: We present simultaneous two-dimensional measurements of the velocity and buoyancy fields on a central vertical plane in two-dimensional line plumes: a free plume distant from vertical boundaries and a wall plume, adjacent to a vertical wall. Data are presented in both an Eulerian and a plume coordinate system that follow the instantaneous turbulent/non-turbulent interface (TNTI) of the plume. We present measurements in both coordinate systems and compare the entrainment in the two flows. We find that the value of the entrainment coefficient in the wall plume is greater than half that of the free plume. The reduction in entrainment is investigated by considering a decomposition of the entrainment coefficient based on the mean kinetic energy where the relative contributions of turbulent production, buoyancy and viscous terms are calculated. The reduced entrainment is also investigated by considering the statistics of the TNTI and the conditional vertical transport of the ambient and engulfed fluid. We show that the wall shear stress is non-negligible and that the free plume exhibits significant meandering. The effect of the meandering on the entrainment process is quantified in terms of the stretching of the TNTI where it is shown that the length of the TNTI is greater in the free plume and, further, the relative vertical transport of the engulfed ambient fluid is observed to be 15 % greater in the free plume. Finally, the turbulent velocity and buoyancy fluctuations, Reynolds stresses and the turbulent buoyancy fluxes are presented in both coordinate systems. [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.2019.790 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 36 StartPage: 1 Titles: – TitleFull: A comparison of entrainment in turbulent line plumes adjacent to and distant from a vertical wall. 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: 10 M: 01 Text: 1/10/2020 Type: published Y: 2020 Identifiers: – Type: issn-print Value: 00221120 Numbering: – Type: volume Value: 882 Titles: – TitleFull: Journal of Fluid Mechanics Type: main |
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