Elastic and shear-thinning effects in contraction flows: a comparison

IF 2.3 3区工程技术 Q2 MECHANICS

Rheologica Acta Pub Date : 2024-06-27 DOI:10.1007/s00397-024-01462-y

Karen Y. Pérez-Salas, Erika. L. García-Romero, Alexa A. Barrientos-Cruz, Salvador Sánchez, Gabriel Ascanio, Juan P. Aguayo

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Abstract

The flow through a 4:1 planar contraction has been investigated using different rheological models having the same shear viscosity, namely, the inelastic Carreau-Yasuda model (CY), the enhanced Bautista-Manero-Puig (eBMP), and the exponential version of the Phan-Thien/Tanner (PTT). Noticeable discrepancies were observed with the CY model and the eBMP in terms of the velocity profiles along the centerline and in the exit channel (near the end of the geometry) normal to the flow direction. Transient planar extensional viscosity shows a large effect on vortex dynamics although the effect of transient and steady elongation on pressure drop seems negligible. Simulation results allowed gathering that pressure drop is largely influenced by the shear-thinning behavior of the fluid, noticeably affected by elasticity, and less by extensional viscosity.

Graphical Abstract

Abstract Image

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收缩流中的弹性和剪切稀化效应：比较

采用具有相同剪切粘度的不同流变模型，即无弹性 Carreau-Yasuda 模型（CY）、增强型 Bautista-Manero-Puig 模型（eBMP）和指数型 Phan-Thien/Tanner 模型（PTT），研究了流经 4:1 平面收缩的流动情况。观察到 CY 模型和 eBMP 在沿中心线和出口通道（靠近几何图形的末端）法线流向的速度剖面上存在明显差异。尽管瞬态和稳定伸长对压力降的影响似乎可以忽略不计，但瞬态平面伸长粘度对涡流动力学的影响很大。模拟结果表明，压力降在很大程度上受流体剪切稀化行为的影响，明显受弹性的影响，而较少受延伸粘度的影响。

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来源期刊

Rheologica Acta 物理-力学

CiteScore

4.60

自引率

8.70%

发文量

审稿时长

3 months

期刊介绍： "Rheologica Acta is the official journal of The European Society of Rheology. The aim of the journal is to advance the science of rheology, by publishing high quality peer reviewed articles, invited reviews and peer reviewed short communications. The Scope of Rheologica Acta includes: - Advances in rheometrical and rheo-physical techniques, rheo-optics, microrheology - Rheology of soft matter systems, including polymer melts and solutions, colloidal dispersions, cement, ceramics, glasses, gels, emulsions, surfactant systems, liquid crystals, biomaterials and food. - Rheology of Solids, chemo-rheology - Electro and magnetorheology - Theory of rheology - Non-Newtonian fluid mechanics, complex fluids in microfluidic devices and flow instabilities - Interfacial rheology Rheologica Acta aims to publish papers which represent a substantial advance in the field, mere data reports or incremental work will not be considered. Priority will be given to papers that are methodological in nature and are beneficial to a wide range of material classes. It should also be noted that the list of topics given above is meant to be representative, not exhaustive. The editors welcome feedback on the journal and suggestions for reviews and comments."