Liquid-gas mass transfer of volatile substances in an energy dissipating structure

Natércia Matias, Filipa Ferreira, José Saldanha Matos, Asbjørn Haaning Nielsen, Jes Vollertsen

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

Resumé

Mass transfer of a range of volatile substances was studied under highly turbulent conditions. The applied setup mimicked drop structures, where the release of volatile organic carbons likely occurs at a high rate. The experiments covered several substances in a range of resistances from residing entirely in the liquid film to being fully in the gas film. The twofilm theory yielded a good prediction of the whole measured range. This allowed the experimental validation of a method where two reference substances are applied, to determine the transfer of any other substance - independently of where its resistance to mass transfer resides. One finding was that the range of dimensionless Henry's constants, where both films contributed by more than 5%, was 0.0027 to 1.05, which is over five times higher than the accepted rule of thumb (0.0005-0.18). Another finding was that the ratio between the liquid and the gas film mass transfer coefficients of the reference substances was similar for the two drop configurations studied. If this holds true over a wider range of configurations, such a ratio constitutes a valuable shortcut to the current practice of ignoring gas film resistance in the estimation of mass transfer rates.

OriginalsprogEngelsk
TidsskriftWater Environment Research
Vol/bind90
Udgave nummer3
Sider (fra-til)269-277
Antal sider9
ISSN1061-4303
DOI
StatusUdgivet - 1 mar. 2018

Fingerprint

volatile substance
mass transfer
Mass transfer
Gases
liquid
Liquids
gas
energy
Liquid films
Organic carbon
organic carbon
prediction
Experiments
experiment

Emneord

  • Air-water exchange
  • Free-fall drop
  • Henry’s constant
  • Reference substances
  • Two-film theory

Citer dette

Matias, Natércia ; Ferreira, Filipa ; Matos, José Saldanha ; Nielsen, Asbjørn Haaning ; Vollertsen, Jes. / Liquid-gas mass transfer of volatile substances in an energy dissipating structure. I: Water Environment Research. 2018 ; Bind 90, Nr. 3. s. 269-277.
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abstract = "Mass transfer of a range of volatile substances was studied under highly turbulent conditions. The applied setup mimicked drop structures, where the release of volatile organic carbons likely occurs at a high rate. The experiments covered several substances in a range of resistances from residing entirely in the liquid film to being fully in the gas film. The twofilm theory yielded a good prediction of the whole measured range. This allowed the experimental validation of a method where two reference substances are applied, to determine the transfer of any other substance - independently of where its resistance to mass transfer resides. One finding was that the range of dimensionless Henry's constants, where both films contributed by more than 5{\%}, was 0.0027 to 1.05, which is over five times higher than the accepted rule of thumb (0.0005-0.18). Another finding was that the ratio between the liquid and the gas film mass transfer coefficients of the reference substances was similar for the two drop configurations studied. If this holds true over a wider range of configurations, such a ratio constitutes a valuable shortcut to the current practice of ignoring gas film resistance in the estimation of mass transfer rates.",
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Liquid-gas mass transfer of volatile substances in an energy dissipating structure. / Matias, Natércia; Ferreira, Filipa; Matos, José Saldanha; Nielsen, Asbjørn Haaning; Vollertsen, Jes.

I: Water Environment Research, Bind 90, Nr. 3, 01.03.2018, s. 269-277.

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

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