Higher modes of mixed buoyant-Marangoni unstable convection originated from a droplet dissolving in a liquid/liquid system with miscibility gap

Marcello Lappa, Chiara Piccolo

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

Some phenomena, never observed before, concerning a system composed by two organic-liquid bi-component phases with a miscibility gap, used as transparent surrogates for immiscible metal alloys, are discussed and elucidated in the framework of experimental analyses and numerical simulations. It is shown that a single dissolving droplet at the bottom of a test cell behaves as an intriguing pattern-forming dynamical system leading to a wealth of different spatio-temporal modes of convection when the imposed temperature gradient is increased. The last part of the analysis is devoted to comparison with other similar phenomena (the flow instability pertaining to the Marangoni flow around bubbles surrounded by a liquid heated from above, and the case of rising buoyant jets), showing analogies and differences. Such a comparison is also used as a means to focus on the intrinsic nature of the present instability.
LanguageEnglish
Pages4262-4272
Number of pages11
JournalPhysics of Fluids
Volume16
Issue number12
DOIs
Publication statusPublished - 30 Apr 2004

Fingerprint

Marangoni convection
miscibility gap
dissolving
Solubility
organic liquids
Liquids
liquids
Bubbles (in fluids)
dynamical systems
Thermal gradients
temperature gradients
Dynamical systems
convection
bubbles
Computer simulation
Metals
cells
metals
simulation
Convection

Keywords

  • unstable convection
  • droplet dissolving
  • liquid/liquid system
  • miscibility gap
  • liquid metals
  • convection
  • Marangoni convection
  • fluid drops
  • organic liquids

Cite this

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abstract = "Some phenomena, never observed before, concerning a system composed by two organic-liquid bi-component phases with a miscibility gap, used as transparent surrogates for immiscible metal alloys, are discussed and elucidated in the framework of experimental analyses and numerical simulations. It is shown that a single dissolving droplet at the bottom of a test cell behaves as an intriguing pattern-forming dynamical system leading to a wealth of different spatio-temporal modes of convection when the imposed temperature gradient is increased. The last part of the analysis is devoted to comparison with other similar phenomena (the flow instability pertaining to the Marangoni flow around bubbles surrounded by a liquid heated from above, and the case of rising buoyant jets), showing analogies and differences. Such a comparison is also used as a means to focus on the intrinsic nature of the present instability.",
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Higher modes of mixed buoyant-Marangoni unstable convection originated from a droplet dissolving in a liquid/liquid system with miscibility gap. / Lappa, Marcello; Piccolo, Chiara .

In: Physics of Fluids, Vol. 16, No. 12, 30.04.2004, p. 4262-4272.

Research output: Contribution to journalArticle

TY - JOUR

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AU - Lappa, Marcello

AU - Piccolo, Chiara

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AB - Some phenomena, never observed before, concerning a system composed by two organic-liquid bi-component phases with a miscibility gap, used as transparent surrogates for immiscible metal alloys, are discussed and elucidated in the framework of experimental analyses and numerical simulations. It is shown that a single dissolving droplet at the bottom of a test cell behaves as an intriguing pattern-forming dynamical system leading to a wealth of different spatio-temporal modes of convection when the imposed temperature gradient is increased. The last part of the analysis is devoted to comparison with other similar phenomena (the flow instability pertaining to the Marangoni flow around bubbles surrounded by a liquid heated from above, and the case of rising buoyant jets), showing analogies and differences. Such a comparison is also used as a means to focus on the intrinsic nature of the present instability.

KW - unstable convection

KW - droplet dissolving

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KW - miscibility gap

KW - liquid metals

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KW - Marangoni convection

KW - fluid drops

KW - organic liquids

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