Multiscale simulations of interfacial slip for polymer melts under shear flow

Yan, Hong; Qin, Fangfang; Wan, Zhen-Hua; Sun, De Jun

doi:10.1007/s10404-020-02407-6

Cited by 3 publications

(2 citation statements)

References 41 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…We adopt dimensionless LJ units for convenience in the following paper by setting σ = ε = m = 1 and the Boltzmann constant k B = 1, where σ, ε, and m are the characteristic length scale, the energy scale, and the mass of fluid particles, respectively. In this way, the velocity unit σ/τ, the shear rate unit τ –1 , the time unit , and the surface tension unit ε/σ 2 are all equal to 1.…”

Section: Methodsmentioning

confidence: 99%

Origin of Rebound Suppression for Dilute Polymer Solution Droplets on Superhydrophobic Substrate

et al. 2021

Self Cite

View full text Add to dashboard Cite

Controlling droplet deposition with a minute amount of polymer additives is of profound practical importance in a wild range of applications. Previous work ascribed the relevant mechanisms to extensional viscosity, normal stress, wetting properties, etc., but the mechanism remains controversial. In this paper, we employ molecular dynamics simulations systematically for the first time to investigate the origin of rebound suppression for dilute polymer solution droplets on a flat superhydrophobic substrate. The results demonstrate that polymer−substrate interactions and impact velocities dominate the antirebound phenomenon. For low impact velocities, the dynamic characteristics of droplets are insensitive to polymer additives. However, large impact velocities will enhance the stretch behavior of polymer chains and make the chains closer to the substrate, increasing the probability of polymer molecules contacting the bottom substrate. With the cooperation of strong polymer−substrate interactions, polymer molecules can be absorbed easily by the bottom substrate, resisting the retraction process and leading to the onset of the antirebound behavior.

show abstract

Section: Methodsmentioning

confidence: 99%

Origin of Rebound Suppression for Dilute Polymer Solution Droplets on Superhydrophobic Substrate

et al. 2021

Self Cite

View full text Add to dashboard Cite

show abstract

“…35 Sun et al 61 apply their model to Poiseuille flow with energy exchange and later to a wall of equally spaced posts. 48 The work of Yan et al 166 represents an application of domain decomposition coupling to explore slip of a polymer melt where the near-wall region is modelled with MD and the remaining domain by CFD. They show that as shear rate drops, the computational saving increases up to two orders of magnitude.…”

Section: Applicationsmentioning

confidence: 99%