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Mass transfer in a packed, pulsed column
Author(s) -
Krasuk J. H.,
Smith J. M.
Publication year - 1964
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.690100535
Subject(s) - reynolds number , laminar flow , mass transfer , dimensionless quantity , mechanics , packed bed , settling , mass transfer coefficient , thermodynamics , chemistry , tube (container) , flow (mathematics) , materials science , sherwood number , porosity , analytical chemistry (journal) , turbulence , chromatography , physics , composite material , nusselt number
Equations in terms of a pulse Reynolds number and dimensionless pulse velocity are presented for mass transfer coefficients in pulsed flow in a packed bed. Mass transfer from the wall and from the particles is considered. The development, applicable up to a particle Reynolds number of 40, is based upon a previous study of pulsed laminar flow in an empty tube. The experimental measurements consisted of rates of dissolution of β‐naphthol from the wall and from the particles within the bed. From these data time‐average mass transfer coefficients k p were computed. The improvement in k p increased with frequency and decreased with average flow rate, although the increase was always less than in an empty tube at equivalent conditions. Steady flow measurements indicated that the coefficient for mass transfer from the tube wall was influenced by the degree of settling of the bed. This effect could be related to the change in porosity accompanying the settling process. A new empirical correlation is proposed to account for the effect of porosity changes.