Role of natural convection in the dissolution of sessile droplets

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Abstract

The dissolution process of small (initial (equivalent) radius R0 < 1 mm) long-chain alcohol (of various types) sessile droplets in water is studied, disentangling diffusive and convective contributions. The latter can arise for high solubilities of the alcohol, as the density of the alcohol–water mixture is then considerably less than that of pure water, giving rise to buoyancy-driven convection. The convective flow around the droplets is measured, using micro-particle image velocimetry (mPIV) and the schlieren technique. When non-dimensionalizing the system, we find a universal Sh Ra1=4 scaling relation for all alcohols (of different solubilities) and all droplets in the convective regime. Here Sh is the Sherwood number (dimensionless mass flux) and Ra is the Rayleigh number (dimensionless density difference between clean and alcohol-saturated water). This scaling implies the scaling relation c / R5=4 0 of the convective dissolution time c, which is found to agree with experimental data. We show that in the convective regime the plume Reynolds number (the dimensionless velocity) of the detaching alcohol-saturated plume follows Rep Sc
Original languageEnglish
Pages (from-to)45-67
JournalJournal of fluid mechanics
Volume794
DOIs
Publication statusPublished - 2016

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Natural convection
free convection
dissolving
Dissolution
alcohols
Alcohols
scaling
plumes
solubility
Solubility
water
dimensionless numbers
Water
convective flow
Rayleigh number
particle image velocimetry
Buoyancy
buoyancy
Velocity measurement
Reynolds number

Keywords

  • METIS-317148
  • IR-101167

Cite this

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title = "Role of natural convection in the dissolution of sessile droplets",
abstract = "The dissolution process of small (initial (equivalent) radius R0 < 1 mm) long-chain alcohol (of various types) sessile droplets in water is studied, disentangling diffusive and convective contributions. The latter can arise for high solubilities of the alcohol, as the density of the alcohol–water mixture is then considerably less than that of pure water, giving rise to buoyancy-driven convection. The convective flow around the droplets is measured, using micro-particle image velocimetry (mPIV) and the schlieren technique. When non-dimensionalizing the system, we find a universal Sh Ra1=4 scaling relation for all alcohols (of different solubilities) and all droplets in the convective regime. Here Sh is the Sherwood number (dimensionless mass flux) and Ra is the Rayleigh number (dimensionless density difference between clean and alcohol-saturated water). This scaling implies the scaling relation c / R5=4 0 of the convective dissolution time c, which is found to agree with experimental data. We show that in the convective regime the plume Reynolds number (the dimensionless velocity) of the detaching alcohol-saturated plume follows Rep Sc",
keywords = "METIS-317148, IR-101167",
author = "E. Dietrich and S. Wildeman and C.W. Visser and K.A. Hofhuis and Kooij, {Ernst S.} and Zandvliet, {Henricus J.W.} and Detlef Lohse",
year = "2016",
doi = "10.1017/jfm.2016.158",
language = "English",
volume = "794",
pages = "45--67",
journal = "Journal of fluid mechanics",
issn = "0022-1120",
publisher = "Cambridge University Press",

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Role of natural convection in the dissolution of sessile droplets. / Dietrich, E.; Wildeman, S.; Visser, C.W.; Hofhuis, K.A.; Kooij, Ernst S.; Zandvliet, Henricus J.W.; Lohse, Detlef.

In: Journal of fluid mechanics, Vol. 794, 2016, p. 45-67.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Role of natural convection in the dissolution of sessile droplets

AU - Dietrich, E.

AU - Wildeman, S.

AU - Visser, C.W.

AU - Hofhuis, K.A.

AU - Kooij, Ernst S.

AU - Zandvliet, Henricus J.W.

AU - Lohse, Detlef

PY - 2016

Y1 - 2016

N2 - The dissolution process of small (initial (equivalent) radius R0 < 1 mm) long-chain alcohol (of various types) sessile droplets in water is studied, disentangling diffusive and convective contributions. The latter can arise for high solubilities of the alcohol, as the density of the alcohol–water mixture is then considerably less than that of pure water, giving rise to buoyancy-driven convection. The convective flow around the droplets is measured, using micro-particle image velocimetry (mPIV) and the schlieren technique. When non-dimensionalizing the system, we find a universal Sh Ra1=4 scaling relation for all alcohols (of different solubilities) and all droplets in the convective regime. Here Sh is the Sherwood number (dimensionless mass flux) and Ra is the Rayleigh number (dimensionless density difference between clean and alcohol-saturated water). This scaling implies the scaling relation c / R5=4 0 of the convective dissolution time c, which is found to agree with experimental data. We show that in the convective regime the plume Reynolds number (the dimensionless velocity) of the detaching alcohol-saturated plume follows Rep Sc

AB - The dissolution process of small (initial (equivalent) radius R0 < 1 mm) long-chain alcohol (of various types) sessile droplets in water is studied, disentangling diffusive and convective contributions. The latter can arise for high solubilities of the alcohol, as the density of the alcohol–water mixture is then considerably less than that of pure water, giving rise to buoyancy-driven convection. The convective flow around the droplets is measured, using micro-particle image velocimetry (mPIV) and the schlieren technique. When non-dimensionalizing the system, we find a universal Sh Ra1=4 scaling relation for all alcohols (of different solubilities) and all droplets in the convective regime. Here Sh is the Sherwood number (dimensionless mass flux) and Ra is the Rayleigh number (dimensionless density difference between clean and alcohol-saturated water). This scaling implies the scaling relation c / R5=4 0 of the convective dissolution time c, which is found to agree with experimental data. We show that in the convective regime the plume Reynolds number (the dimensionless velocity) of the detaching alcohol-saturated plume follows Rep Sc

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KW - IR-101167

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DO - 10.1017/jfm.2016.158

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