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Evaporation rates of liquids to flowing gas streams
Author(s) -
Severson D. E.,
Madden A. J.,
Piret Edgar L.
Publication year - 1959
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690050404
Subject(s) - chlorobenzene , dimensionless quantity , chemistry , air stream , evaporation , boundary layer , inert , helium , mass transfer , inert gas , mechanics , thermodynamics , partial pressure , analytical chemistry (journal) , chromatography , environmental science , oxygen , biochemistry , physics , organic chemistry , environmental engineering , catalysis
The influence of high concentration gradients and high evaporative velocities on rates of mass transfer was studied by evaporating liquids into low‐speed inert gas streams at pressures approaching the vapor pressure of the liquids. Inert gas concentration in some experiments changed nearly fivefold across the boundary layer. The velocity normal to the surface (owing to evaporation), usually neglected in comparison with main‐stream velocity, varied from 0.038 to 19 times the main‐stream velocity. The data for air‐water, air‐carbon tetrachloride, air‐chlorobenzene, and helium‐chlorobenzene systems were represented within experimental error over the Graetz number range of 0.1 to 1,800 by the flat‐duct equations of Butler and Plewes ( 2 ) and also by the usual dimensionless plots.