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Thermal boundary layers in sweeping gas membrane distillation processes
Author(s) -
Khayet M.,
Godino M. P.,
Mengual J. I.
Publication year - 2002
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.690480713
Subject(s) - membrane distillation , knudsen diffusion , concentration polarization , membrane , chemistry , thermodynamics , boundary layer , mechanics , distillation , porosity , knudsen number , inlet , thermal , molecular diffusion , chromatography , desalination , organic chemistry , physics , mechanical engineering , metric (unit) , biochemistry , operations management , engineering , economics
The sweeping gas membrane distillation process was analyzed in a plate and frame membrane module, and a method clarifying the contribution of each boundary layer separately was developed. The temperature polarization coefficients of the fluid phases as well as the overall one have been defined, and their effects on the permeate flux were studied. Also studied is the influence of experimentally relevant parameters, such as the inlet temperatures or circulation velocities of the fluids. Results from two porous and hydrophobic membranes in different experimental conditions were interpreted on the basis of a combined Knudsen/molecular diffusion flow model. The theory agreed well with the experiment.