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On reduced modeling of mass transport in wavy falling films
Author(s) -
Bandi P.,
Modigell M.,
Groß S.,
Reusken A.,
Zhang L.,
Heng Y.,
Marquardt W.,
Mhamdi A.
Publication year - 2018
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.16065
Subject(s) - falling (accident) , laminar flow , mass transfer , heat transfer , mechanics , materials science , kinetic energy , mass transport , phase (matter) , chemistry , physics , engineering physics , classical mechanics , medicine , environmental health , organic chemistry
In many industrial units such as packing columns, falling film reactors, etc., the liquid phase is designed as a falling film. It is well known that the mass and heat transfer in laminar wavy film flows is significantly enhanced compared to flat films. The kinetic phenomena underlying the increase in mass and heat transfer are, however, still not fully understood. For an efficient design of falling film units, computational models that account for these enhanced transport mechanisms are of key importance. In this article, we present a reduced modeling approach based on a long‐wave approximation to the fluid dynamics of the film. Furthermore, we introduce a new two‐dimensional (2D) high‐resolution laser‐induced luminescence measurement technique. Both in the numerical simulation results and in the high‐resolution 2D‐concentration measurements obtained in the experiments we observe similar patterns of high concentrations locally, especially in the areas close to the wave hump. © 2018 American Institute of Chemical Engineers AIChE J , 64: 2265–2276, 2018