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Bilayer Rayleigh-Marangoni convection: transitions in flow structures at the interface

Zhao, Alex X. and Wagner, Claus and Narayanan, Ranga and Friedrich, Rainer (1995) Bilayer Rayleigh-Marangoni convection: transitions in flow structures at the interface. Proceedings of the Royal Society a-Mathematical Physical and Engineering Sciences, 451 (1942), pp. 487-502. The Royal Society. doi: 10.1098/rspa.1995.0138. ISSN 1364-5021.

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Official URL: https://royalsocietypublishing.org/doi/10.1098/rspa.1995.0138


The fluid physics of buoyancy-driven (Rayleigh) and interfacial tension-driven (Marangoni) convection is examined for two superimposed layers of fluids. This con­vection occurs on account of temperature gradients that are imposed perpendicular to the fluid-fluid interface. Interfacial deflections, small as they may be, play an important part in identifying the mechanism that governs the flow, and calculations have been made that indicate whether hot or cold fluid flows towards or away from a crest or a trough. As a result, four possible flow structures or modes at the interface have been identified. Two heating styles, heating from below and above, are com­pared and the behaviour of the fluid physics as a function of total fluid depths, depth ratios and gravity levels is explained. Changes in modes result because of changes in these parameters. We have given plausible physically based arguments that predict the sequential change in modes as these parameters are changed and have veri­fied our conjectures with calculations. Flow mechanisms in the case of a solidifying lower phase have also been studied, as this has an application to liquid-encapsulated crystal growth. Where convection is deemed detrimental to crystal homogeneity, we conclude that the liquid-encapsulated method of crystal growth is best conducted under Earths gravity.

Item URL in elib:https://elib.dlr.de/193999/
Document Type:Article
Title:Bilayer Rayleigh-Marangoni convection: transitions in flow structures at the interface
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Zhao, Alex X.University of FloridaUNSPECIFIEDUNSPECIFIED
Wagner, ClausUNSPECIFIEDhttps://orcid.org/0000-0003-2273-0568UNSPECIFIED
Narayanan, RangaUniversity of FloridaUNSPECIFIEDUNSPECIFIED
Date:8 November 1995
Journal or Publication Title:Proceedings of the Royal Society a-Mathematical Physical and Engineering Sciences
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:Yes
Page Range:pp. 487-502
EditorsEmailEditor's ORCID iDORCID Put Code
Publisher:The Royal Society
Keywords:Rayleigh-Marangoni convection, instability, interface
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Transport
HGF - Program Themes:Rail Transport
DLR - Research area:Transport
DLR - Program:V SC Schienenverkehr
DLR - Research theme (Project):V - RoSto - Rolling Stock
Location: Göttingen
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Ground Vehicles
Deposited By: Wagner, Prof. Dr.-Ing. Claus
Deposited On:30 Mar 2023 15:33
Last Modified:30 Mar 2023 15:33

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