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Numerical simulation of dip-coating in the evaporative regime
Mohar Dey1, Frédéric Doumenc2,3, Béatrice Guerrier1
1Laboratoire FAST, Univ. Paris-Sud, CNRS, Université Paris-Saclay, F-91405, Orsay, France.
The European Physical Journal. E, Soft Matter
|February 28, 2016
Summary
This study models polymer solution dip-coating driven by evaporation, not viscous forces. It reveals self-pattern formation due to solutal Marangoni effects and analyzes evaporation
Area of Science:
- Fluid dynamics
- Polymer science
- Surface science
Background:
- Dip-coating is a common technique for thin film deposition.
- Evaporation-driven flow in polymer solutions is less understood than viscous-driven flow.
- Solutal Marangoni effects can induce self-patterning in drying films.
Purpose of the Study:
- To numerically simulate polymer solution behavior in an evaporation-driven dip-coating experiment.
- To investigate the influence of evaporation rate and spatial variations on deposit morphology.
- To analyze the interplay of diffusion and advection in polymer flux at low substrate velocities.
Main Methods:
- Hydrodynamic modeling and numerical simulations.
- Application of lubrication approximation for liquid phase flow.
- Consideration of diffusion-limited evaporation in stagnant air.
Main Results:
- Observed self-patterning of polymer deposits for specific parameter ranges.
- Determined the effect of evaporation rate on deposit morphology.
- Assessed the impact of evaporative flux variations on deposit wavelength and thickness.
Conclusions:
- Evaporation-driven flow in polymer solutions exhibits complex self-patterning phenomena.
- Evaporation rate and spatial flux variations are critical for controlling deposit characteristics.
- Understanding polymer flux components is essential for selecting appropriate boundary conditions in simulations.
