Journal
COATINGS
Volume 10, Issue 7, Pages -Publisher
MDPI
DOI: 10.3390/coatings10070691
Keywords
roll-over-web coating; couple stress fluid; lubrication approximation theory; optimal homotopy asymptotic method (OHAM)
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Funding
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Korea Government (Ministry of Science and ICT) [NRF-2017R1C1B5017786, 2018R1A4A1025998]
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This study presents the theoretical investigation of a roll-over thin layer formation under the lubrication approximation theory. The set of differential equations derived by lubrication approximation is solved by the optimal homotopy asymptotic method (OHAM) to obtain precise expressions for pressure and velocity gradients. Critical quantities such as velocity, pressure gradient, and coating layer depth are numerically estimated. The impact of parameters affecting the coating and layer formation is revealed in detail. Results indicate that the transport properties of the higher-grade fluid play an essential role in regulating velocity, pressure, and the final coated region. Moreover, couple stress effects on the properties of fluid particles to be coated on roller-surface have also been studied.
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