Accurate Closure for the Configuration Dynamics and Rheology of Dilute Polymer Chains in Arbitrary Flows
Accurate Closure for the Configuration Dynamics and Rheology of Dilute Polymer Chains in Arbitrary Flows
复制标题
任意流中稀聚合物链构型动力学和流变学的精确闭合
DOI:
10.1021/acs.macromol.0c02342
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发表时间:
2021
期刊:
影响因子:
5.5
通讯作者:
Larson, Ronald G.
中科院分区:
文献类型:
--
作者:
Saha Dalal, Indranil;Kumar, Praphul;Larson, Ronald G.
We present a new, “FENE-mode”, constitutive model for conformation and stress dynamics of dilute polymer chains in arbitrary flows, obtained by preaveraging equations for the normal modes using a “representative” spring constant that depends on the magnitudes of both the first and second modes, accounting for both overall chain stretch and chain folds. Simulations with this model are orders of magnitude faster than with multi-spring Brownian dynamics (BD) simulations and yet retain more of their accuracy than other preaveraged models. This is demonstrated by comparing the predictions of the FENE-mode model with those from BD simulations in startup of uniaxial extension, relaxation after cessation of this flow, steady shear, and mixed flows. For all cases, we find that, even when few modes are used, the transient and final steady-state conformations and stresses are in much better agreement with BD predictions than those of the existing preaveraged FENE-P and FENE-PM models. The possibility of extension of the approach to the more important case of entangled polymers is also discussed. Because the model allows cost-accuracy trade-offs to be made through choice of the number of modes used, the model should be ideal for multidimensional simulations of polymer flows.
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DOI:
--
发表时间:
2014
期刊:
影响因子:
--
作者:
I. S. Dalal;C. Hsieh;Alex Albaugh;R. Larson
通讯作者:
R. Larson
影响因子:
56.9
作者:
Perkins, TT;Smith, DE;Chu, S
通讯作者:
Chu, S
DOI:
--
发表时间:
1989
期刊:
影响因子:
--
作者:
H. C. Öttinger
通讯作者:
H. C. Öttinger
DOI:
--
发表时间:
2014
期刊:
影响因子:
--
作者:
Aashish Jain;C. Sasmal;R. Hartkamp;R. Hartkamp;B. D. Todd;J. Prakash
通讯作者:
J. Prakash
影响因子:
3.3
作者:
Charles M. Schroeder
通讯作者:
Charles M. Schroeder