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Coating flows with interfacial air drag. A nonlinear theory
Author(s) -
Nigam K. D. P.,
Esmail M. N.
Publication year - 1982
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.5450600401
Subject(s) - mechanics , drag , reynolds number , countercurrent exchange , materials science , shearing (physics) , boundary layer , dimensionless quantity , flow (mathematics) , surface tension , coating , thermodynamics , composite material , turbulence , physics
The problem of the coating flow of a Newtonian liquid under the influence of a contiguous air flow is considered. The effect of the air flow is simulated by a constant tangential viscous shearing, calculated as the average skin friction per unit area of a boundary layer air flow over a smooth flat plate. Predictions are obtained for the liquid flow characteristics in cases of cocurrent and countercurrent forced air flows. Significant changes in the liquid film thickness start to occur when the absolute value of a dimensionless shearing number, Tn, exceeds 0.01. This value is not sensitive to the other flow parameters. The study is limited to low and moderate liquid Reynolds numbers, when the surface tension forces have considerable to noticeable effect.