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Mass transfer to falling films: Part I. Application of the surface‐stretch model to uniform wave motion
Author(s) -
Howard D. W.,
Lightfoot E. N.
Publication year - 1968
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.690140322
Subject(s) - rippling , mass transfer , laminar flow , mechanics , constant (computer programming) , surface (topology) , diffusion , falling (accident) , materials science , chemistry , physics , thermodynamics , geometry , mathematics , medicine , environmental health , computer science , programming language
A method is developed for predicting rates of gas absorption into laminar rippling films in terms of the surface velocities. The description is an extension of the surface‐stretch model of mass transfer ( 1 ) and is therefore useful for cases of high Peclet number. The description can be used with any of the presently known hydrodynamic models of rippling films and with any future models which may be developed, provided they satisfy two relatively nonrestrictive conditions: (1) the ripples are of a two dimensional nature, being of constant thickness in the direction normal to their direction of propagation, and having no velocity components in this transverse direction; and (2) the ripples propagate at constant celerity and with constant shape. It can be used for both traveling and standing waves and can be extended to describe the effects of high net‐mass transfer rates and combined diffusion and chemical reaction.