Damping of three-dimensional waves on coating films dragged by moving substrates
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Damping of three-dimensional waves on coating films dragged by moving substratesDate
2023-07-12Citation
Barreiro-Villaverde, D., Gosset, A., Lema, M., & Mendez, M. A. (2023). Damping of three-dimensional waves on coating films dragged by moving substrates. Physics of Fluids, 35(7), 072110. https://doi.org/10.1063/5.0154144
Abstract
[Abstract]: Paints and coatings often feature interfacial defects due to disturbances during the deposition process which, if they persist until solidification, worsens the product quality. In this article, we investigate the stability of a thin liquid film dragged by a vertical substrate moving against gravity, a fundamental flow configuration in various coating processes.
The receptivity of the liquid film to three-dimensional disturbances is analyzed with Direct Numerical Simulations (DNS) and an in-house Integral Boundary Layer (IBL) film model. The latter was used for Linear Stability Analysis (LSA) and nonlinear wave propagation analysis. The numerical implementation of the IBL film model combines a finite volume formulation with a pseudo-spectral approach for the capillary terms that allows for investigating non-periodic surface tension-dominated flows. Both the model and the numerical solver were successfully validated with DNS computations. The combination of these numerical tools allows for describing the mechanisms of capillary and nonlinear damping and identifying the instability threshold of the coating processes. The results show that transverse modulations
can be beneficial for damping two-dimensional waves within the range of operational conditions considered in this study, which are relevant to air-knife and slot-die coating.
Keywords
Linear stability analysis
Interface defects
Thin film deposition
Computational fluid dynamics
Interfacial flows
Interface defects
Thin film deposition
Computational fluid dynamics
Interfacial flows
Description
Accepted manuscript
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This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in D. Barreiro-Villaverde et al., Phys. Fluids 35, 072110 (2023). and may be found at https://doi.org/10.1063/5.0154144
ISSN
1089-7666