Role of polymer concentration and molecular weight on the rebounding behaviors of polymer solution droplet impacting on hydrophobic surfaces

Huh, Hyungkyu; Jung, Sungjune; Seo, Kyung Won; Lee, Sang Joon

doi:10.1007/s10404-014-1518-4

Cited by 48 publications

(42 citation statements)

References 39 publications

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“…13). These results support that the antirebound effect is mainly due to the modification of the surface wetting properties by the deposited polymer molecules rather than the bulk fluid properties, which is in agreement with the experimental observations of Bertola [8], Bertola and Wang [16], and Huh et al [18].…”

Section: -13supporting

confidence: 92%

“…Biolè and Bertola [17] provided significant experimental evidence that the main contribution to the contact line friction is given by small liquid filaments pulling the contact line in the radial direction. In addition, Huh et al [18] have shown that energy dissipation is significantly increased during the retraction phase due to polymeric residues left on the substrate. They found that the energy dissipation increases with the molecular weight and concentration of the polymer.…”

Section: Introductionmentioning

confidence: 99%

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Effects of viscoelasticity on drop impact and spreading on a solid surface

Izbassarov

Muradoğlu

2016

Phys. Rev. Fluids

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The effects of viscoelasticity on drop impact and spreading on a flat solid surface are studied computationally using a finite-difference-front-tracking method. The finitely extensible nonlinear elastic-Chilcott-Rallison model is used to account for the fluid viscoelasticity. It is found that viscoelasticity favors advancement of contact line during the spreading phase, leading to a slight increase in the maximum spreading, in agreement with experimental observations [Huh, Jung, Seo, and Lee, Microfluid. Nanofluid. 18, 1221 (2015)]. However, in contrast with the well-known antirebound effects of polymeric additives, the viscoelasticity is found to enhance the tendency of the drop rebound in the receding phase. These results suggest that the antirebound effects are mainly due to the polymer-induced modification of wetting properties of the substrate rather than the change in the material properties of the drop fluid. A model is proposed to test this hypothesis. It is found that the model results in good qualitative agreement with the experimental observations and the antirebound behavior can be captured by the modification of surface wetting properties in the receding phase.

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Section: -13supporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Effects of viscoelasticity on drop impact and spreading on a solid surface

Izbassarov

Muradoğlu

2016

Phys. Rev. Fluids

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“…他们认为, 液滴反弹被抑制是由于高分子和纳米粒子聚集在基底上, 导致摩擦增加而引起的. Huh等人 [18] 猜想在液滴回缩阶段, 由于高分子残留在基底上, 会导致能量耗散显著增加, 而且能量耗散会随着高分子的分子量和浓度的增加而增加. Bartolo等人 [19] 则认为在液滴回缩过程中, 高分子溶液的黏弹性带来了较大的正应力, 正应力抵消了驱动接触线移动的表面张力, 从而导致液滴回缩速度减小, 反弹被抑制.…”

Section: 径没有明显的差异同时结果也表明基底在抑制反unclassified

Dynamics of viscoelastic drops impacting onto a hydrophobic solid substrate

Han¹,

Liu²,

Liu³

et al. 2018

Sci. Sin.-Phys. Mech. Astron.

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“…Most of the phenomena that droplets hit on a solid obstacle can be divided into the level of the droplets impacting horizontal wall [3][4][5][6], spherical surface [7,8] and inclined wall [9,10]. If the size and shape of solid obstacles are taken into account, solid obstacles can be categorized as spherical obstacles [7,8,11] , cylindrical obstacles and rectangular obstacles [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Simulation of droplet impacting a square solid obstacle in microchannel with different wettability by using high density ratio pseudopotential multiple-relaxation-time (MRT) lattice Boltzmann method (LBM)

et al. 2019

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In this paper, a pseudopotential high density ratio (DR) lattice Boltzmann model was developed by incorporating multi-relaxation-time collision matrix, large DR external force term, surface tension adjustment external force term, and solid–liquid pseudopotential force. It was found that the improved model can precisely capture the two-phase interface at high DR. Besides, the effects of initial Reynolds number, Weber number, solid wall contact angle (CA), ratio of obstacle size to droplet diameter (χ1), and ratio of channel width to droplet diameter (χ2) on the deformation and breakup of a droplet when impacting on a square obstacle were investigated. The results showed that with the Reynolds number increasing, the droplet will fall along the obstacle and then spread along both sides of the obstacle. Furthermore, by increasing Weber number, the breakup of the liquid film will be delayed and the liquid film will be stretched to form an elongated ligament. With decreasing of the wettability of solid particle (CA → 180°), the droplet will surround the obstacle and then detach from the obstacle. When χ1 is greater than 0.5, the droplet will spread along both sides of the obstacle quickly; otherwise, the droplet will be ruptured earlier. Furthermore, when χ2 decreases, the droplet will spread earlier and then fall along the wall more quickly; otherwise, the droplet will expand along both sides of the obstacle. Moreover, increasing the hydrophilicity of the microchannel, the droplet will impact the channel more rapidly and infiltrate the wall along the upstream and downstream simultaneously; on the contrary, the droplet will wet downstream only.

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Role of polymer concentration and molecular weight on the rebounding behaviors of polymer solution droplet impacting on hydrophobic surfaces

Abstract: friction coefficient of the polymer solution shows a linear relationship with reduced concentration.

Cited by 48 publications

References 39 publications

Effects of viscoelasticity on drop impact and spreading on a solid surface

Effects of viscoelasticity on drop impact and spreading on a solid surface

Dynamics of viscoelastic drops impacting onto a hydrophobic solid substrate

Simulation of droplet impacting a square solid obstacle in microchannel with different wettability by using high density ratio pseudopotential multiple-relaxation-time (MRT) lattice Boltzmann method (LBM)

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