Three-dimensional Numerical Simulation of Viscoelastic Phase Separation under Shear: the Roles of Bulk and Shear Relaxation Moduli

Jing-yi Chen; Zhong Jin; Ke-da Yang

doi:10.1007/s10118-015-1711-2

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Three-dimensional Numerical Simulation of Viscoelastic Phase Separation under Shear: the Roles of Bulk and Shear Relaxation Moduli

PAPER | Updated：2021-06-21

- Three-dimensional Numerical Simulation of Viscoelastic Phase Separation under Shear: the Roles of Bulk and Shear Relaxation Moduli
- Chinese Journal of Polymer Science Vol. 33, Issue 11, Pages: 1562-1573(2015)
- Affiliations：
  
  a.School of Materials Science and Engineering, Beihang University, Beijing 100191, China
  b.Supercomputing Center, Computer Network Information Center, Chinese Academy of Sciences, Beijing 100190, China
- Author bio：
  
  **Ke-da Yang (杨科大), E-mail: yangkeda@sccas.cn
- Funds：
- DOI：10.1007/s10118-015-1711-2
  CLC：
- Received：16 April 2015，
  
  Revised：2015-06-09，
  
  Accepted：06 July 2015，
  
  Published：2015-11
- Accepted：
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Jing-yi Chen, Zhong Jin, Ke-da Yang. Three-dimensional Numerical Simulation of Viscoelastic Phase Separation under Shear: the Roles of Bulk and Shear Relaxation Moduli[J]. Chinese Journal of Polymer Science, 2015, 33(11): 1562-1573.
DOI：

Jing-yi Chen, Zhong Jin, Ke-da Yang. Three-dimensional Numerical Simulation of Viscoelastic Phase Separation under Shear: the Roles of Bulk and Shear Relaxation Moduli[J]. Chinese Journal of Polymer Science, 2015, 33(11): 1562-1573. DOI： 10.1007/s10118-015-1711-2.

摘要

Abstract

The morphological

dynamic and rheological characteristics in the viscoelastic phase separation (VPS) of sheared polymer solutions are investigated by three-dimensional (3D) numerical simulations of viscoelastic model. The simulations are accelerated by graphic process unit (GPU) to break through the limitation of computation power. Firstly

the morphological and dynamic characteristics of VPS under shear are presented by comparing with those in classic phase separation (CPS). The results show that the phase inversion and phase shrink take place in VPS under shear. Then

the roles of bulk and shear relaxation moduli in VPS are investigated in details. The bulk relaxation modulus slows down the phase separation process under shear

but not affects the dynamic path of VPS. The dynamic path can be divided into three stages: freezing stage

growth stage and stable stage. The second overshoot phenomenon in the shear stress is observed

and explained by the breakdown and reform of string structures. The shear modulus affects morphology evolution in the late stage of VPS under shear.

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