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dc.contributor.authorBenkreira, Hadj
dc.contributor.authorShibata, Yusuke
dc.contributor.authorIto, K.
dc.date.accessioned2021-04-08T13:19:22Z
dc.date.available2021-04-08T13:19:22Z
dc.date.issued2021
dc.identifier.citationBenkreira H, Shibata, Y and Ito K (2021) The fluid mechanics of tensioned web roll coating. Chemical Engineering Science. 239: 116612.en_US
dc.identifier.urihttp://hdl.handle.net/10454/18420
dc.descriptionYesen_US
dc.description.abstractTensioned web-roll coating is widely used but has surprisingly received little research attention. Here, a new semi-empirical model that predicts film transfer from applicator roller to web is developed and tested against data collected from a pilot coating line. The film transfer is found to vary linearly with web to applicator speed ratio S. Flow stability investigations revealed three types of defects: rivulets, air entrainment due to dynamic wetting failure and cascade, occurring at different values of S and capillary number Ca. Rivulets occurred at Ca< 0.4 and S> 0.71-0.81, air entrainment at Ca>0.4 and S>0.71-0.83 and cascades at S>1.1 for Ca up to 6. Web speeds at which dynamic wetting failure occurred were, for the same Ca, comparatively higher than those that occur in dip coating. The data show that such hydrodynamic assistance is due to the coating bead being confined, more so with increasing web wrap angle β.en_US
dc.description.sponsorshipThe authors acknowledge the support of the Films R&D Centre of Toyobo Co. Ltd., Otsu, Japan and of the Thin Liquid Films Research Group of the University of Bradford, UK.en_US
dc.language.isoenen_US
dc.relation.isreferencedbyhttps://doi.org/10.1016/j.ces.2021.116612en_US
dc.rights© 2021 Elsevier. Reproduced in accordance with the publisher's self-archiving policy. This manuscript version is made available under the CC-BY-NC-ND 4.0 license.en_US
dc.subjectTensioned web roll coatingen_US
dc.subjectThin filmsen_US
dc.subjectCascadeen_US
dc.subjectDynamic wettingen_US
dc.titleThe fluid mechanics of tensioned web roll coatingen_US
dc.status.refereedYesen_US
dc.date.Accepted2021-03-22
dc.date.application2021-03-26
dc.typeArticleen_US
dc.date.EndofEmbargo2022-03-26
dc.type.versionAccepted manuscripten_US
dc.description.publicnotesThe full-text of this article will be released for public view at the end of the publisher embargo on 26th March 2022.
refterms.dateFOA2021-04-08T13:19:50Z
dc.openaccess.statusGreenen_US


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