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Experimental study of dynamic wetting in reverse‐roll coating
Author(s) -
Benkreira H.
Publication year - 2002
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690480205
Subject(s) - wetting , coating , entrainment (biomusicology) , mechanics , cascade , materials science , position (finance) , air entrainment , composite material , chemistry , physics , acoustics , chromatography , finance , rhythm , economics
The movement of the dynamic wetting line in reverse‐roll coating was followed in a series of experiments that gave position, X D , angle, θ D and the critical metering roller speed, V M, cascade , for the onset of cascade. The data were correlated with operating conditions and compared with plunging‐tape air‐entrainment speeds, V* plunging . It was found that there was hydrodynamic assistance of wetting similar in form but smaller in magnitude to that reported in curtain coating. The correlated data for X D and θ D also provide boundary conditions, which can replace the assumptions usually made in the simulations of reverse‐roll coating flows.