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Title: Lumen mass transfer in hollow-fiber membrane processes with constant external resistances

Abstract

Membrane processes have recently become an accepted unit operation for a wide variety of separations in industry and in environmental applications. Hollow-fiber membrane processes with a constant external resistance having a constant or variable shell concentration resulting from an operational mode of cocurrent or countercurrent are studied. By solving numerically the continuity mass-conservation equation with the corresponding boundary conditions, the lumen laminar mass-transfer coefficients for both cases are correlated. The correlations greatly improve the calculating accuracy of the overall mass-transfer coefficient and can be used to obtain the lumen mixed-cup concentration by an algebraic equation substituting the partial differential equation. A separation factor m{prime} is introduced to characterize the effect of the operational mode. Calculation results demonstrate that the lumen mass-transfer coefficient is independent of the real lumen and shell concentrations, but it is greatly influenced by m{prime}. The countercurrent mode, compared to the cocurrent mode, provides not only a higher mean driving force, but a higher lumen mass-transfer coefficient. This conclusion is novel and valid for the tube-shell heat or mass-transfer processes and is supported by the experimental data in the literature and the authors` gas membrane separation experiments.

Authors:
;  [1]
  1. Inst. Superior Tecnico, Lisboa (Portugal)
Publication Date:
OSTI Identifier:
556727
Resource Type:
Journal Article
Journal Name:
AIChE Journal
Additional Journal Information:
Journal Volume: 43; Journal Issue: 8; Other Information: PBD: Aug 1997
Country of Publication:
United States
Language:
English
Subject:
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; MEMBRANE TRANSPORT; MASS TRANSFER; FIBERS; MEMBRANES; SEPARATION PROCESSES; MATHEMATICAL MODELS; GASES

Citation Formats

Qin, Y, and Cabral, J M.S. Lumen mass transfer in hollow-fiber membrane processes with constant external resistances. United States: N. p., 1997. Web. doi:10.1002/aic.690430807.
Qin, Y, & Cabral, J M.S. Lumen mass transfer in hollow-fiber membrane processes with constant external resistances. United States. https://doi.org/10.1002/aic.690430807
Qin, Y, and Cabral, J M.S. 1997. "Lumen mass transfer in hollow-fiber membrane processes with constant external resistances". United States. https://doi.org/10.1002/aic.690430807.
@article{osti_556727,
title = {Lumen mass transfer in hollow-fiber membrane processes with constant external resistances},
author = {Qin, Y and Cabral, J M.S.},
abstractNote = {Membrane processes have recently become an accepted unit operation for a wide variety of separations in industry and in environmental applications. Hollow-fiber membrane processes with a constant external resistance having a constant or variable shell concentration resulting from an operational mode of cocurrent or countercurrent are studied. By solving numerically the continuity mass-conservation equation with the corresponding boundary conditions, the lumen laminar mass-transfer coefficients for both cases are correlated. The correlations greatly improve the calculating accuracy of the overall mass-transfer coefficient and can be used to obtain the lumen mixed-cup concentration by an algebraic equation substituting the partial differential equation. A separation factor m{prime} is introduced to characterize the effect of the operational mode. Calculation results demonstrate that the lumen mass-transfer coefficient is independent of the real lumen and shell concentrations, but it is greatly influenced by m{prime}. The countercurrent mode, compared to the cocurrent mode, provides not only a higher mean driving force, but a higher lumen mass-transfer coefficient. This conclusion is novel and valid for the tube-shell heat or mass-transfer processes and is supported by the experimental data in the literature and the authors` gas membrane separation experiments.},
doi = {10.1002/aic.690430807},
url = {https://www.osti.gov/biblio/556727}, journal = {AIChE Journal},
number = 8,
volume = 43,
place = {United States},
year = {Fri Aug 01 00:00:00 EDT 1997},
month = {Fri Aug 01 00:00:00 EDT 1997}
}