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Simulation of a suspended droplet under evaporation with Marangoni effects
KTH.
KTH.
2016 (English)In: International Journal of Heat and Mass Transfer, ISSN 0017-9310, E-ISSN 1879-2189, Vol. 91, 853-860 p.Article in journal (Refereed) PublishedText
Abstract [en]

We investigate the Marangoni effects in a hexane droplet under evaporation and close to its critical point. A lattice Boltzmann model is used to perform 3D numerical simulations. In a first case, the droplet is placed in its own vapor and a temperature gradient is imposed. The droplet locomotion through the domain is observed, where the temperature differences across the surface is proportional to the droplet velocity and the Marangoni effect is confirmed. The droplet is then set under a forced convection condition. The results show that the Marangoni stresses play a major role in maintaining the internal circulation when the superheated vapor temperature is increased. Surprisingly, surface tension variations along the interface due to temperature change may affect heat transfer and internal circulation even for low Weber number. Other results and considerations regarding the droplet surface are also discussed.

Place, publisher, year, edition, pages
Elsevier , 2016. Vol. 91, 853-860 p.
Keyword [en]
Phase change, Internal circulation, Lattice Boltzmann method, Droplet heating
National Category
Fluid Mechanics and Acoustics
Identifiers
URN: urn:nbn:se:sh:diva-30094DOI: 10.1016/j.ijheatmasstransfer.2016.02.073ISI: 000374616900082ScopusID: 2-s2.0-84960872136OAI: oai:DiVA.org:sh-30094DiVA: diva2:932509
Funder
Swedish Research Council, 2010-3938]Swedish Research Council, 2011-5355]
Available from: 2016-03-14 Created: 2016-06-01 Last updated: 2016-06-01Bibliographically approved

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Amberg, Gustav
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