Impact of fluid memory on wetting approaching the air entrainment limit

You, Wei; Garoff, Stephen; Walker, Lynn M.

doi:10.1016/j.jcis.2009.05.034

Cited by 5 publications

(5 citation statements)

References 26 publications

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“…The numerical predictions above agree qualitatively with the experimental observations of Wei et al [16,6,17]. To connect the simulations to reality, we note two points about the model parameters.…”

Section: Resultssupporting

confidence: 80%

“…In their experiment, the Weissenberg number was small and the Boger fluid behaved essentially as its Newtonian solvent. Garoff and co-workers conducted a series of experiments on dynamic wetting by immersing a cylinder into a bath of polymer liquid at a constant speed [14][15][16]6,17]. By comparing the steady interface shape with that from the asymptotic analysis in Newtonian fluids [18], they observed that the non-Newtonian effect was confined to the close vicinity of the contact line.…”

Section: Introductionmentioning

confidence: 99%

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Phase-field simulations of dynamic wetting of viscoelastic fluids

Yue

Feng

2012

Journal of Non-Newtonian Fluid Mechanics

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Section: Resultssupporting

confidence: 80%

Section: Introductionmentioning

confidence: 99%

Phase-field simulations of dynamic wetting of viscoelastic fluids

Yue

Feng

2012

Journal of Non-Newtonian Fluid Mechanics

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“…We have examined the dynamic wetting behavior of several Boger fluids based on polyisobutylene (PIB) and polystyrene (PS) [29,36,37]. As an example of the dynamic wetting behavior we have observed in these fluids, we discuss a PIB Boger fluid with λ = 5 s relaxation time.…”

Section: Non-newtonian Fluids: Elasticitymentioning

confidence: 99%

Dynamic wetting with viscous Newtonian and non-Newtonian fluids

You¹,

Ramé²,

Walker³

et al. 2009

J. Phys.: Condens. Matter

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We examine various aspects of dynamic wetting with viscous Newtonian and non-Newtonian fluids. Rather than concentrating on the mechanisms that relieve the classic contact line stress singularity, we focus on the behavior in the wedge flow near the contact line which has the dominant influence on wetting with these fluids. Our experiments show that a Newtonian polymer melt composed of highly flexible molecules exhibits dynamic wetting behavior described very well by hydrodynamic models that capture the critical properties of the Newtonian wedge flow near the contact line. We find that shear thinning has a strong impact on dynamic wetting, by reducing the drag of the solid on the fluid near the contact line, while the elasticity of a Boger fluid has a weaker impact on dynamic wetting. Finally, we find that other polymeric fluids, nominally Newtonian in rheometric measurements, exhibit deviations from Newtonian dynamic wetting behavior.

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“…Many applications like the deposition of pesticides on plant leaves or ink-jet printing involve polymer solutions. Such fluids exhibit non-Newtonian rheology such as shear-thinning viscosity and viscoelasticity, which can affect the contact-line dynamics, as has been demonstrated through several experimental studies (Seevaratnam et al 2007;Wang et al 2007;Wei, Garoff & Walker 2009a;Wei et al 2009b;Han & Kim 2013;Kim & Rothstein 2015). For the canonical problem of liquid spreading on a substrate, it was found that non-Newtonian drops spreading on completely wetting surfaces still followed the long-time power-law dynamics R ∼ t n , where R(t) is the drop radius, and the exponent n is slightly smaller than the Cox-Voinov-Tanner law n = 1/10 (Rafaï, Bonn & Boudaoud 2004).…”

Section: Introductionmentioning

confidence: 95%

“…2007; Wang et al. 2007; Wei, Garoff & Walker 2009 a ; Wei et al. 2009 b ; Han & Kim 2013; Kim & Rothstein 2015).…”

Section: Introductionmentioning

confidence: 99%

Viscoelastic wetting: Cox–Voinov theory with normal stress effects

Kansal,

Bertin,

Datt

et al. 2024

J. Fluid Mech.

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The classical Cox–Voinov theory of contact line motion provides a relation between the macroscopically observable contact angle, and the microscopic wetting angle as a function of contact-line velocity. Here, we investigate how viscoelasticity, specifically the normal stress effect, modifies the wetting dynamics. Using the thin film equation for the second-order fluid, it is found that the normal stress effect is dominant at small scales yet can significantly affect macroscopic motion. We show that the effect can be incorporated in the Cox–Voinov theory through an apparent microscopic angle, which differs from the true microscopic angle. The theory is applied to the classical problems of drop spreading and dip coating, which shows how normal stress facilitates (inhibits) the motion of advancing (receding) contact lines. For rapid advancing motion, the apparent microscopic angle can tend to zero, in which case the dynamics is described by a regime that was already anticipated in Boudaoud (Eur. Phys. J. E, vol. 22, 2007, pp. 107–109).

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Impact of fluid memory on wetting approaching the air entrainment limit

Cited by 5 publications

References 26 publications

Phase-field simulations of dynamic wetting of viscoelastic fluids

Phase-field simulations of dynamic wetting of viscoelastic fluids

Dynamic wetting with viscous Newtonian and non-Newtonian fluids

Viscoelastic wetting: Cox–Voinov theory with normal stress effects

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