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    The effect of substrate roughness on air entrainment in dip coating

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    The Effect of Substrate Roughness on Air Entrainment in Dip Coating in ChemEngSci in 2004.pdf (944.5Kb)
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    Publication date
    2004
    Author
    Benkreira, Hadj
    Keyword
    Air Entrainment
    Dip Coating
    Roughness
    Dynamic Wetting Failure
    Rights
    © 2004 Elsevier Ltd. Reproduced in accordance with the publisher's self-archiving policy.
    Peer-Reviewed
    Yes
    
    Metadata
    Show full item record
    Abstract
    Dynamic wetting failure was observed in the simple dip coating flow with a series of substrates, which had a rough side and a comparatively smoother side. When we compared the air entrainment speeds on both sides, we found a switch in behaviour at a critical viscosity. At viscosity lower than a critical value, the rough side entrained air at lower speeds than the smooth side. Above the critical viscosity the reverse was observed, the smooth side entraining air at lower speed than the rough side. Only substrates with significant roughness showed this behaviour. Below a critical roughness, the rough side always entrained air at lower speeds than the smooth side. These results have both fundamental and practical merits. They support the hydrodynamic theory of dynamic wetting failure and imply that one can coat viscous fluids at higher speeds than normal by roughening substrates. A mechanism and a model are presented to explain dynamic wetting failure on rough surfaces.
    URI
    http://hdl.handle.net/10454/807
    Citation
    Benkreira, H. (2004). The effect of substrate roughness on air entrainment in dip coating. Chemical Engineering Science. Vol. 59, No. 13, pp. 2745-2751.
    Link to publisher’s version
    http://dx.doi.org/10.1016/j.ces.2007.09.045
    Type
    Article
    Collections
    Engineering and Informatics Publications

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