Journal article 322 views
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 
,
Fawzi Belblidia
,
Fawzi Belblidia
Mechanics of Time-Dependent Materials
Swansea University Authors:
Michael Webster , Fawzi Belblidia
Full text not available from this repository: check for access using links below.
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...
| Published in: | Mechanics of Time-Dependent Materials |
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| ISSN: | 1385-2000 1573-2738 |
| Published: |
2013
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| Online Access: |
Check full text
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| URI: | https://cronfa.swan.ac.uk/Record/cronfa15029 |
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| 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, 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. |
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| College: |
Faculty of Science and Engineering |