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Transfer resistance and fluid mechanics
Author(s) -
McCarter Robert J.,
Stutzman Leroy F.
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.690050418
Subject(s) - laminar flow , mass transfer , thermal diffusivity , reynolds number , thermodynamics , turbulence , chemistry , eddy diffusion , fluid mechanics , mechanics , schmidt number , fluid dynamics , heat transfer , flow (mathematics) , materials science , chromatography , physics
Pure liquids were evaporated in a wetted‐wall column into flowing streams of air to investigate the thickness and transfer resistance of gas films. It was found necessary to express Reynolds number relative to the liquid surface to correlate transfer with gas flow. Laminar and buffer layers in the gas phase were calculated from fluid‐flow principles and compared to the effective film thickness calculated from mass transfer and molecular diffusivity. Good agreement was obtained, indicating applicability of fluid mechanics to mass transfer problems. Eddy diffusivity was indicated to have a negligible effect upon the total resistance to transfer. Consequently it might be concluded that in packed towers where distances in the turbulent phase are shorter transfer between phases depends almost entirely upon molecular diffusivity.

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