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Direct Observation of Fluid Mass Transfer Resistance in Porous Media by NMR Spectroscopy
Author(s) -
Tallarek Ulrich,
van Dusschoten Dagmar,
Van As Henk,
Guiochon Georges,
Bayer Ernst
Publication year - 1998
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/(sici)1521-3773(19980803)37:13/14<1882::aid-anie1882>3.0.co;2-u
Subject(s) - tortuosity , mass transfer , porous medium , diffusion , thermal diffusivity , porosity , mass diffusivity , pulsed field gradient , mass transfer coefficient , materials science , kinetic energy , kinetics , fluid dynamics , chemistry , analytical chemistry (journal) , thermodynamics , chromatography , composite material , physics , quantum mechanics
The kinetics of diffusion‐controlled mass transfer between a fluid percolating through a bed of porous particles and the stagnant fluid in the pores of the particles (see drawing on the right) controls the rate of many important processes. The pulsed field gradient NMR method allows the rapid identification of the fraction of fluid exchanged between the stream and the pores during a given period of time. From this data the mass transfer kinetic coefficient, the porosity, the intraparticle diffusivity, and the tortuosity of the porous medium can be determined.