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Stress‐induced diffusion and chemical reaction in nonhomogeneous velocity gradient fields
Author(s) -
Akay G.
Publication year - 1982
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760221303
Subject(s) - laminar flow , diffusion , materials science , viscoelasticity , stress (linguistics) , velocity gradient , dispersion (optics) , macromolecule , capillary action , polymer , molecular diffusion , flow (mathematics) , mechanics , thermodynamics , composite material , chemistry , optics , physics , metric (unit) , linguistics , philosophy , biochemistry , operations management , economics
The theoretical analysis of dispersion with or without stress‐induced diffusion and stress‐induced chemical reaction during laminar flow of viscoelastic fluids in capillaries is given. The results are applied to diffusion and degradation in polymers under nonhomogeneous velocity gradient fields. It is shown that the concentration profiles during dispersion are strongly dependent on axial and radial positions in the presence of stress‐induced diffusion. Stress‐induced degradation rate of macromolecules during capillary flow decreases if the macromolecules are subject to stress‐induced diffusion.