Non-equilibrium chemical potential and stress-induced migration of polymers in tubes

D. Jou, M. Criado-Sancho, J. Casas-Vázquez

Research output: Contribution to journalArticleResearchpeer-review

13 Citations (Scopus)


A non-equilibrium chemical potential depending on the viscous pressure tensor is used to describe shear-induced diffusion in polymer solutions flowing along cylindrical tubes. Our results generalize previous ones in three main aspects: a Flory-Huggins expression for the equilibrium contribution to the chemical potential is used instead of the ideal-gas like expression, the full expression for the steady-state compliance of the solution is taken into account instead of only the polymer contribution, and the influence of the solute molecular mass is explicitly considered. As a qualitatively new result of considerable practical interest, it stands the prediction that in some circumstances, a dynamical instability may appear, which accelerates and enhances the separation process. © 2002 Elsevier Science Ltd. All rights reserved.
Original languageEnglish
Pages (from-to)1599-1605
Publication statusPublished - 7 Jan 2002


  • Flow in tubes
  • Non-equilibrium chemical potential
  • Polymer migration


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