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## Abstract

The finitely extensible nonlinear elastic with Peterlin closure (FENE-P) and simplified Phan-Thien–Tanner (sPTT) viscoelastic models are used widely for modelling of complex fluids. Although they are derived from distinct micro-structural theories, these models can become mathematically identical in steady and homogeneous flows with a particular choice of the values of the model parameters. However, even with this choice of parameter values, the model responses are known to differ from each other in transient flows. In this work, we investigate the responses of the FENE-P and sPTT constitutive models in large-amplitude oscillatory shear (LAOS). In steady shear, the shear stress scales with the non-dimensional group Wi/(aL) ( Wi√ϵ) for the FENE-P (sPTT) model, where Wi is the Weissenberg number, L

^{2}is the limit of extensibility in the FENE-P model ( a being L^{2}/(L^{2}−3) ), and ϵp is the extensibility parameter in the sPTT model. Our numerical and analytical results show that in LAOS, the FENE-P model shows this universality only for large values of L^{2}, whereas the sPTT model shows it for all values of ϵ. In the strongly nonlinear region, there is a drastic difference between the responses of the two models, with the FENE-P model exhibiting strong shear stress overshoots that manifest as self-intersecting secondary loops in the viscous Lissajous curves. We quantify the nonlinearity exhibited by each constitutive model using the sequence of physical processes framework. Despite the high degree of nonlinearity exhibited by the FENE-P model, we also show using fully nonlinear one-dimensional simulations that it does not shear band in LAOS within the range of conditions studied.Original language | English |
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Article number | A10 |

Number of pages | 40 |

Journal | Journal of Fluid Mechanics |

Volume | 979 |

Early online date | 11 Jan 2024 |

DOIs | |

Publication status | Published - 25 Jan 2024 |

## Keywords

- viscoelasticity
- rheology

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