Premium
Turbulent mass transfer rates to a wall for large Schmidt numbers
Author(s) -
Shaw Dudley A.,
Hanratty Thomas J.
Publication year - 1977
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.690230106
Subject(s) - schmidt number , mass transfer , turbulence , mass transfer coefficient , eddy diffusion , mechanics , limiting , thermal diffusivity , physics , thermodynamics , classical mechanics , chemistry , reynolds number , mechanical engineering , engineering
Abstract New measurements are presented on the influence of Schmidt number on the rate of mass transfer between a turbulent fluid and a pipe wall. It is found that for large Schmidt numbers the fully developed mass transfer coefficient is related to the friction velocity and the Schmidt number by the equationThe experiments are accurate enough to rule out the Sc −2/3 or the Sc −2/3 relations commonly used, deduced from plausible limiting expressions for the eddy diffusivity close to a wall. It is argued that these expressions arevalid only over a vanishingly small portion of the concentration field as Sc → ∞.