Modelling contraction flows of bi-disperse polymer blends using the Rolie-Poly and Rolie-Double-Poly equations

Modelling contraction flows of bi-disperse polymer blends using the Rolie-Poly and Rolie-Double-Poly equations
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使用 Rolie-Poly 和 Rolie-Double-Poly 方程模拟双分散聚合物共混物的收缩流

DOI:
10.1007/s13367-019-0021-6
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发表时间:
2019
影响因子:
1.3
通讯作者:
Azahar A
Azahar A
中科院分区:
工程技术4区
文献类型:
--
作者:
Azahar A

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使用最近提出的Rolie-Double-Poly本构模型(Boudaraet al.,2019年)。这种简化的管模型考虑了双分散共混物中长链和短链的动力学之间的非线性耦合,特别是它再现了由约束释放和链收缩之间的耦合引起的拉伸松弛时间的增强。通过使用RheolTool库在OpenFOAM中实现Rolie-Double-Poly和多模Rolie-Poly模型来执行流量计算。虽然这两种模型预测非常相似的流动模式,增强拉伸松弛的Rolie-Double-Pol模型的结果在纯拉伸流中的长链组分的分子拉伸的增加沿着收缩的中心线,但在剪切流中的拉伸减少在通道壁附近。
The flow of a bi-disperse polymer melt through a hyperbolic contraction is simulated using the recently proposed Rolie-Double-Poly constitutive model (Boudaraet al., 2019). This simplified tube model takes account of the nonlinear coupling between the dynamics of the long and short-chains in a bi-disperse blend, in particular it reproduces the enhancement of the stretch relaxation time that arises from the coupling between constraint release and chain retraction. Flow calculations are performed by implementing both the Rolie-Double-Poly and multimode Rolie-Poly models in OpenFOAM using the RheolTool library. While both models predict very similar flow patterns, the enhanced stretch relaxation of the Rolie-Double-Pol models results in an increase in the molecular stretch of the long chain component in the pure extensional flow along the centre-line of the contraction, but a decrease in the stretch in shear-flow near the channel walls.
DOI: 10.1122/1.5052320
发表时间: 2019-01-01
影响因子: 3.3
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