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Title: | Unsteady Flow and Mass Transfer Induced by Rayleigh-Bénard-Marangoni Convection. |
Authors: | Wissink, J Ali, F Herlina, H |
Issue Date: | 3-Dec-2024 |
Publisher: | Springer Nature |
Citation: | Wissink, J., Ali, F. and Herlina, H. (2024) 'Unsteady Flow and Mass Transfer Induced by Rayleigh-Bénard-Marangoni Convection.', in: J.C. Tyacke, and N.R. Vadlamani (eds.) Proceedings of the Cambridge Unsteady Flow Symposium 2024. CUFS 2024, Cambridge, UK, 4-5 March, pp. 243 - 255. doi: 10.1007/978-3-031-69035-8_15. |
Series/Report no.: | Cambridge Unsteady Flow Symposium |
Abstract: | Evaporative cooling at the water surface is usually modelled by imposing a constant heat flux at the surface. This boundary condition allows for variations in the water surface temperature T, which then induce variations in surface tension. The resulting Marangoni forces tend to move surface water from low surface tension (high T) regions to high surface tension (low T) regions. To study the combined effect of buoyancy and Marangoni forces on interfacial mass transfer, (fully resolved) direct numerical simulations have been performed. The simulations were carried out for a fixed macro Rayleigh number of RaL = 21200 and a variety of Marangoni (Ma) numbers to assess the relative importance of buoyancy and Marangoni forces on the air-water mass transfer. It is known that both forces tend to reinforce one another even though the underlying physical mechanisms are different. This is highlighted in the present results showing that Marangoni forces, acting at the water surface, induce very efficient mixing of dissolved gases (as well as heat) in a well-defined layer adjacent to the surface. Buoyant convection, on the other hand, tends to cause deep penetration of plumes of cold, saturated water into the bulk. |
Description: | Acknowledgements: The simulations were performed on the supercomputer bwUniCluster 2.0 supported by the state of Baden-Württemberg, Germany through bwHPC. |
URI: | https://bura.brunel.ac.uk/handle/2438/31299 |
DOI: | https://doi.org/10.1007/978-3-031-69035-8_15 |
ISBN: | 978-3-031-69034-1 (hbk) 978-3-031-69035-8 (ebk) |
Other Identifiers: | ORCiD: Jan Wissink https://orcid.org/0000-0002-3608-7449 |
Appears in Collections: | Dept of Mechanical and Aerospace Engineering Embargoed Research Papers |
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FullText.pdf | Embargoed until 3 December 2025. Copyright © 2025 The Author(s), under exclusive license to Springer Nature Switzerland AG. This version of the article has been accepted for publication, after peer review (when applicable) and is subject to Springer Nature’s AM terms of use, but is not the Version of Record and does not reflect post-acceptance improvements, or any corrections. The Version of Record is available online at: https://doi.org/10.1007/978-3-031-69035-8_15 (see: https://www.springernature.com/gp/open-research/policies/journal-policies). | 1.49 MB | Adobe PDF | View/Open |
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