Numerical solutions of thin-film equations for polymer flows
@article{Salez2012NumericalSO, title={Numerical solutions of thin-film equations for polymer flows}, author={Thomas J Salez and Joshua D. McGraw and Sara L. Cormier and Oliver B{\"a}umchen and Kari Dalnoki-Veress and {\'E}lie Rapha{\"e}l}, journal={The European Physical Journal E}, year={2012}, volume={35}, pages={1-9} }
We report on the numerical implementation of thin-film equations that describe the capillary-driven evolution of viscous films, in two-dimensional configurations. After recalling the general forms and features of these equations, we focus on two particular cases inspired by experiments: the leveling of a step at the free surface of a polymer film, and the leveling of a polymer droplet over an identical film. In each case, we first discuss the long-term self-similar regime reached by the…
34 Citations
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References
SHOWING 1-10 OF 50 REFERENCES
Self-similarity and energy dissipation in stepped polymer films.
- PhysicsPhysical review letters
- 2012
The results of experiments indicate the effectiveness of stepped polymer films to elucidate nanoscale rheological properties and derive a master expression for the time dependence of the excess free energy as a function of the material properties and film geometry.
Capillary-driven flow induced by a stepped perturbation atop a viscous film
- Physics, Engineering
- 2012
Thin viscous liquid films driven by capillarity are well described in the lubrication theory through the thin film equation. In this article, we present an analytical solution of this equation for a…
Instabilities in Gravity Driven Flow of Thin Fluid Films
- EngineeringSIAM Rev.
- 2003
This paper presents theoretical, computational, and experimental aspects of the instability development in the flow of thin fluid films, and derivation of the thin film equation using lubrication approximation is presented.
Reduced interfacial entanglement density affects the boundary conditions of polymer flow.
- PhysicsPhysical review letters
- 2009
Evidence is given that merely a slip-boundary condition at the solid-liquid interface can lead to an asymmetric profile, and variation of molecular weight shows that slippage is directly linked to chain entanglements.
Beyond Tanner's law: crossover between spreading regimes of a viscous droplet on an identical film.
- PhysicsPhysical review letters
- 2012
A theoretical model based on thin film hydrodynamics that quantitatively describes the observed crossover between the two leveling regimes of polymer microdroplets is developed.
The Linear Limit of the Dipole Problem for the Thin Film Equation
- MathematicsSIAM J. Appl. Math.
- 2006
Investigating self-similar solutions of the dipole problem for the one-dimensional thin film equation on the half-line yields a surprisingly rich set of stable solutions for the intermediate asymptotics of this problem.
Dynamics and stability of thin liquid films
- Physics
- 2009
The dynamics and stability of thin liquid films have fascinated scientists over many decades: the observations of regular wave patterns in film flows down a windowpane or along guttering, the…
Reduced viscosity in thin polymer films.
- PhysicsPhysical review letters
- 2006
The dewetting of thin polystyrene films (20-500 nm) on a liquid substrate is studied at time scales that are long compared to the reptation time. It is shown that the kinetics correspond to those of…
Spreading of liquid droplets on permeable polymeric surfaces
- Physics
- 2009
The spreading of liquid droplets on viscous liquid and glassy polymer films has been studied with molecular dynamics simulations. Unlike spreading on solid surfaces the liquid droplet simultaneously…
Viscosity at small scales in polymer melts
- Physics
- 2000
Flows around small colloidal particles of diameter b, or in thin films, capillaries, etc., cannot always be described in terms of the macroscopic polymer viscosity. We discuss these features for…