Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 358029
Title A simple constitutive model for a polymer flow near a polymer-grafted wall
Author(s) Stepanyan, R.; Slot, J.J.M.; Molenaar, J.; Tchesnokov, M.A.
Source Journal of Rheology 49 (2005)5. - ISSN 0148-6055 - p. 1129 - 1151.
DOI https://doi.org/10.1122/1.2000968
Department(s) Mathematical and Statistical Methods - Biometris
PE&RC
Publication type Refereed Article in a scientific journal
Publication year 2005
Keyword(s) convective constraint release - stick-slip transition - entangled polymers - viscoelastic properties - molecular-weight - dynamic dilution - solid interface - capillary-flow - chain stretch - tube model
Abstract A simple constitutive model is proposed to describe a polymer flow near a polymer-grafted wall. The model is based on a generalization of the Rolie-Poly equation [A. E. Likhtman and R. S. Graham, J. Non-Newton. Fluid Mech. 114, 1¿12 (2003)] to a "bulk+wall" system combined with a microscopic picture of the relaxation of the tethered chains. Different grafting regimes are considered, varying from nonoverlapping to strongly interacting tethered chains. Despite its simplicity, the model allows one to reproduce all the generic features of the flow. Different scaling regimes are predicted, in accord with earlier studies, and the transition between them is quantified. Special attention is paid to a careful comparison to available experimental data: a reasonable agreement is demonstrated and possible shortcomings of the model are discussed
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