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Liquid‐Gas Mass Transfer of Volatile Substances in an Energy Dissipating Structure
Author(s) -
Matias Natércia,
Ferreira Filipa,
Matos José Saldanha,
Nielsen Asbjørn Haaning,
Vollertsen Jes
Publication year - 2018
Publication title -
water environment research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.356
H-Index - 73
eISSN - 1554-7531
pISSN - 1061-4303
DOI - 10.2175/106143017x15131012152816
Subject(s) - dimensionless quantity , mass transfer , chemistry , drop (telecommunication) , range (aeronautics) , mass transfer coefficient , thermodynamics , analytical chemistry (journal) , turbulence , chromatography , materials science , composite material , telecommunications , physics , computer science
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 two‐film 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.