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Viscoelastic computations for reverse roll coating with dynamic wetting lines and the Phan-Thien-Tanner models

Shirley O. S. Echendu, Hamid R. Tamaddon-Jahromi, Mike F. Webster, Michael Webster Orcid Logo

Rheologica Acta, Volume: 53, Issue: 4, Pages: 315 - 331

Swansea University Author: Michael Webster Orcid Logo

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DOI (Published version): 10.1007/s00397-014-0761-7

Abstract

The computational modelling of reverse roll coating with dynamic wetting line were analysed for various non-Newtonian viscoelastic materials appealing to Phan-Thien Tanner (PTT) network class of models suitable for typical polymer solutions, with properties of shear-thinning and strain-hardening/sof...

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Published in: Rheologica Acta
Published: 2014
URI: https://cronfa.swan.ac.uk/Record/cronfa24190
first_indexed 2015-11-09T11:28:11Z
last_indexed 2018-02-09T05:03:41Z
id cronfa24190
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spelling 2016-04-29T16:13:32.5820723 v2 24190 2015-11-08 Viscoelastic computations for reverse roll coating with dynamic wetting lines and the Phan-Thien-Tanner models b6a811513b34d56e66489512fc2c6c61 0000-0002-7722-821X Michael Webster Michael Webster true false 2015-11-08 The computational modelling of reverse roll coating with dynamic wetting line were analysed for various non-Newtonian viscoelastic materials appealing to Phan-Thien Tanner (PTT) network class of models suitable for typical polymer solutions, with properties of shear-thinning and strain-hardening/softening. The numerical technique utilises a hybrid finite element-subcell finite volume algorithm with dynamic free-surface location, drawing upon a fractional staged predictor-corrector semi-implicit time-stepping procedure of incremental pressure-correction form. The numerical solution is investigated following a systematic study which allows for parametric variation in elasticity (We-variation), extensional hardening-softening (ε), and solvent fraction (β). Under incompressible liquid flow conditions, LPTT and EPTT models were used to solve the paint strip coatings, in reverse roll coating configuration. This involves two dimensional planar reverse roll coating domains, considering a range of Weissenberg numbers (We) up to critical levels, addressing velocity fields and vortex developments, pressure and lift profiles, shear-rate and stress fields. Various differences are observed comparing solutions for these constitutive models. Concerning the effects of elasticity, increase in We stimulates vortex structures which are visible at both downstream meniscus and upstream narrowest nip region, whilst decreasing the peak pressure and lift values at the nip constriction. At low values (ε&#62;0.5, β=0.1 ) of extensional viscosity, LPTT model flow fields were much easier to extract attaining critical We levels up to unity, in contrast to critical We levels of 0.4 for EPTT solutions; the position is reversed at higher extensional viscosity levels (ε&#60;0.5). This trend reveals qualitative agreement with theoretical studies. Noting influence under EPTT solution, increasing the peak level of extensional hardening/softening stimulates vortex activity around the nip region, with corresponding increase in peak pressure and lift values. Journal Article Rheologica Acta 53 4 315 331 Reverse roller coating, free surface, dynamic wetting, finite elements, finite volume sub-cell, viscoelastic Phan-Thien Tanner models. 31 12 2014 2014-12-31 10.1007/s00397-014-0761-7 COLLEGE NANME COLLEGE CODE Swansea University 2016-04-29T16:13:32.5820723 2015-11-08T19:14:39.4928174 Faculty of Science and Engineering School of Engineering and Applied Sciences - Uncategorised Shirley O. S. Echendu 1 Hamid R. Tamaddon-Jahromi 2 Mike F. Webster 3 Michael Webster 0000-0002-7722-821X 4
title Viscoelastic computations for reverse roll coating with dynamic wetting lines and the Phan-Thien-Tanner models
spellingShingle Viscoelastic computations for reverse roll coating with dynamic wetting lines and the Phan-Thien-Tanner models
Michael Webster
title_short Viscoelastic computations for reverse roll coating with dynamic wetting lines and the Phan-Thien-Tanner models
title_full Viscoelastic computations for reverse roll coating with dynamic wetting lines and the Phan-Thien-Tanner models
title_fullStr Viscoelastic computations for reverse roll coating with dynamic wetting lines and the Phan-Thien-Tanner models
title_full_unstemmed Viscoelastic computations for reverse roll coating with dynamic wetting lines and the Phan-Thien-Tanner models
title_sort Viscoelastic computations for reverse roll coating with dynamic wetting lines and the Phan-Thien-Tanner models
author_id_str_mv b6a811513b34d56e66489512fc2c6c61
author_id_fullname_str_mv b6a811513b34d56e66489512fc2c6c61_***_Michael Webster
author Michael Webster
author2 Shirley O. S. Echendu
Hamid R. Tamaddon-Jahromi
Mike F. Webster
Michael Webster
format Journal article
container_title Rheologica Acta
container_volume 53
container_issue 4
container_start_page 315
publishDate 2014
institution Swansea University
doi_str_mv 10.1007/s00397-014-0761-7
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Engineering and Applied Sciences - Uncategorised{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Engineering and Applied Sciences - Uncategorised
document_store_str 0
active_str 0
description The computational modelling of reverse roll coating with dynamic wetting line were analysed for various non-Newtonian viscoelastic materials appealing to Phan-Thien Tanner (PTT) network class of models suitable for typical polymer solutions, with properties of shear-thinning and strain-hardening/softening. The numerical technique utilises a hybrid finite element-subcell finite volume algorithm with dynamic free-surface location, drawing upon a fractional staged predictor-corrector semi-implicit time-stepping procedure of incremental pressure-correction form. The numerical solution is investigated following a systematic study which allows for parametric variation in elasticity (We-variation), extensional hardening-softening (ε), and solvent fraction (β). Under incompressible liquid flow conditions, LPTT and EPTT models were used to solve the paint strip coatings, in reverse roll coating configuration. This involves two dimensional planar reverse roll coating domains, considering a range of Weissenberg numbers (We) up to critical levels, addressing velocity fields and vortex developments, pressure and lift profiles, shear-rate and stress fields. Various differences are observed comparing solutions for these constitutive models. Concerning the effects of elasticity, increase in We stimulates vortex structures which are visible at both downstream meniscus and upstream narrowest nip region, whilst decreasing the peak pressure and lift values at the nip constriction. At low values (ε&#62;0.5, β=0.1 ) of extensional viscosity, LPTT model flow fields were much easier to extract attaining critical We levels up to unity, in contrast to critical We levels of 0.4 for EPTT solutions; the position is reversed at higher extensional viscosity levels (ε&#60;0.5). This trend reveals qualitative agreement with theoretical studies. Noting influence under EPTT solution, increasing the peak level of extensional hardening/softening stimulates vortex activity around the nip region, with corresponding increase in peak pressure and lift values.
published_date 2014-12-31T07:00:11Z
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score 10.911687

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