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Reverse roll-coating flow: a computational investigation towards high-speed defect free coating

F Belblidia, H. R Tamaddon-Jahromi, S. O. S Echendu, M. F Webster, Michael Webster Orcid Logo, Fawzi Belblidia Orcid Logo

Mechanics of Time-Dependent Materials

Swansea University Authors: Michael Webster Orcid Logo, Fawzi Belblidia Orcid Logo

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DOI (Published version): 10.1007/s11043-012-9204-y

Abstract

A finite element Taylor–Galerkin pressure-correction algorithm is employed to simulate a high-speed defect-free roll-coating flow, which substantiates a coating process with a free meniscus surface. Findings are applicable across a wide range of coating sectors in optimisation of coating performance...

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Published in: Mechanics of Time-Dependent Materials
ISSN: 1385-2000 1573-2738
Published: 2013
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URI: https://cronfa.swan.ac.uk/Record/cronfa15029
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last_indexed 2018-02-09T04:46:43Z
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spelling 2013-06-10T09:05:28.3466856 v2 15029 2013-06-10 Reverse roll-coating flow: a computational investigation towards high-speed defect free coating b6a811513b34d56e66489512fc2c6c61 0000-0002-7722-821X Michael Webster Michael Webster true false 7e0feb96ca2d685180b495e8983f3940 0000-0002-8170-0468 Fawzi Belblidia Fawzi Belblidia true false 2013-06-10 EEN A finite element Taylor–Galerkin pressure-correction algorithm is employed to simulate a high-speed defect-free roll-coating flow, which substantiates a coating process with a free meniscus surface. Findings are applicable across a wide range of coating sectors in optimisation of coating performance, which targets adaptive and intelligent process control. Industrially, there is a major drive towards using new material products and raising coating line-speeds, to address increased efficiency and productivity. This study has sought to attack these issues by developing an effective predictive toolset for high-speed defect-free coatings. Here, time-stepping/finite element methods are deployed to model this free-surface problem that involves the transfer of a coating fluid from a roller to a substrate (of prescribed wet-film thickness). This procedure is used in conjunction with a set of constitutive equations capable of describing the relevant fluid-film rheology in appropriate detail. Quantities of pressure, lift and drag have been calculated streamwise across the flow domain, and streamline patterns reveal a large recirculating vortex around the meniscus region. Such pressure distributions across the domain display a positive peak which decreases as nip-gap size increases. Further analysis has been conducted, mimicking the presence of a wetting line, whilst varying boundary conditions at the nip. Observation has shown that such inclusion would serve as a relief mechanism to the positive peak pressures generated around the nip zone. Here, through an elasto-hydrodynamic formulation, the elastic deformation of a rubber roll cover (elastomer) has also been introduced, which offers fresh insight into the process with respect to nip-flow behaviour, and allows for the analysis of both positive and negative nip-gaps. Journal Article Mechanics of Time-Dependent Materials 1385-2000 1573-2738 31 12 2013 2013-12-31 10.1007/s11043-012-9204-y COLLEGE NANME Engineering COLLEGE CODE EEN Swansea University 2013-06-10T09:05:28.3466856 2013-06-10T09:05:28.3466856 Faculty of Science and Engineering School of Engineering and Applied Sciences - Uncategorised F Belblidia 1 H. R Tamaddon-Jahromi 2 S. O. S Echendu 3 M. F Webster 4 Michael Webster 0000-0002-7722-821X 5 Fawzi Belblidia 0000-0002-8170-0468 6
title Reverse roll-coating flow: a computational investigation towards high-speed defect free coating
spellingShingle Reverse roll-coating flow: a computational investigation towards high-speed defect free coating
Michael Webster
Fawzi Belblidia
title_short Reverse roll-coating flow: a computational investigation towards high-speed defect free coating
title_full Reverse roll-coating flow: a computational investigation towards high-speed defect free coating
title_fullStr Reverse roll-coating flow: a computational investigation towards high-speed defect free coating
title_full_unstemmed Reverse roll-coating flow: a computational investigation towards high-speed defect free coating
title_sort Reverse roll-coating flow: a computational investigation towards high-speed defect free coating
author_id_str_mv b6a811513b34d56e66489512fc2c6c61
7e0feb96ca2d685180b495e8983f3940
author_id_fullname_str_mv b6a811513b34d56e66489512fc2c6c61_***_Michael Webster
7e0feb96ca2d685180b495e8983f3940_***_Fawzi Belblidia
author Michael Webster
Fawzi Belblidia
author2 F Belblidia
H. R Tamaddon-Jahromi
S. O. S Echendu
M. F Webster
Michael Webster
Fawzi Belblidia
format Journal article
container_title Mechanics of Time-Dependent Materials
publishDate 2013
institution Swansea University
issn 1385-2000
1573-2738
doi_str_mv 10.1007/s11043-012-9204-y
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 A finite element Taylor–Galerkin pressure-correction algorithm is employed to simulate a high-speed defect-free roll-coating flow, which substantiates a coating process with a free meniscus surface. Findings are applicable across a wide range of coating sectors in optimisation of coating performance, which targets adaptive and intelligent process control. Industrially, there is a major drive towards using new material products and raising coating line-speeds, to address increased efficiency and productivity. This study has sought to attack these issues by developing an effective predictive toolset for high-speed defect-free coatings. Here, time-stepping/finite element methods are deployed to model this free-surface problem that involves the transfer of a coating fluid from a roller to a substrate (of prescribed wet-film thickness). This procedure is used in conjunction with a set of constitutive equations capable of describing the relevant fluid-film rheology in appropriate detail. Quantities of pressure, lift and drag have been calculated streamwise across the flow domain, and streamline patterns reveal a large recirculating vortex around the meniscus region. Such pressure distributions across the domain display a positive peak which decreases as nip-gap size increases. Further analysis has been conducted, mimicking the presence of a wetting line, whilst varying boundary conditions at the nip. Observation has shown that such inclusion would serve as a relief mechanism to the positive peak pressures generated around the nip zone. Here, through an elasto-hydrodynamic formulation, the elastic deformation of a rubber roll cover (elastomer) has also been introduced, which offers fresh insight into the process with respect to nip-flow behaviour, and allows for the analysis of both positive and negative nip-gaps.
published_date 2013-12-31T03:17:09Z
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score 11.012678

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