Comparison of viscoelastic flows in two- and three-dimensional serpentine channels
Garg, Himani LU
and Fureby, Christer
LU
(2024)
In Physical Review E: covering statistical, nonlinear, biological, and soft matter physics
109.
- Abstract
- Polymer solutions in the dilute regime play a significant role in industrial applications. Due to the intricate rheological properties of these highly viscoelastic fluids, especially in complex flow geometries, a thorough numerical analysis of their flow dynamics is imperative. In this research, we present a numerical investigation of purely elastic instability occurring in two- and three-dimensional serpentine channels under conditions where fluid inertia is negligible and across a broad spectrum of polymer relaxation times. Our findings reveal a strong qualitative agreement between the existing experimental results obtained from dilute solutions of flexible polymers in microfluidic devices and the numerical simulations conducted in two... (More)
- Polymer solutions in the dilute regime play a significant role in industrial applications. Due to the intricate rheological properties of these highly viscoelastic fluids, especially in complex flow geometries, a thorough numerical analysis of their flow dynamics is imperative. In this research, we present a numerical investigation of purely elastic instability occurring in two- and three-dimensional serpentine channels under conditions where fluid inertia is negligible and across a broad spectrum of polymer relaxation times. Our findings reveal a strong qualitative agreement between the existing experimental results obtained from dilute solutions of flexible polymers in microfluidic devices and the numerical simulations conducted in two and three dimensions using the Oldroyd-B model. Spatial flow observations and statistical analysis of temporal flow features indicate that this purely elastic turbulent flow exhibits nonhomogeneous, non-Gaussian, and anisotropic characteristics across all scales. Additionally, our comparison of two- and three-dimensional simulations demonstrates that the elastic instability is primarily driven by the curvature of the streamlines induced by the flow geometry, rather than the weak secondary flow in the azimuthal direction. Therefore, our two-dimensional numerical simulations successfully replicate, at least qualitatively, the features observed in three-dimensional experiments. Furthermore, spectral analysis suggests that, in comparison to elastic turbulence in the dilute regime, the range of scales for the excited fluctuations is narrower. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/757ffc2c-de31-4614-aa3e-040272f223b6
- author
- Garg, Himani
LU
and Fureby, Christer
LU
- organization
- publishing date
- 2024-05-29
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- Elastic Turbulence, microfluidic channel, Viscoelastic fluid, OpenFOAM, Numerical simulations
- in
- Physical Review E: covering statistical, nonlinear, biological, and soft matter physics
- volume
- 109
- article number
- 055108
- pages
- 14 pages
- publisher
- American Physical Society
- ISSN
- 2470-0045
- DOI
- 10.1103/PhysRevE.109.055108
- language
- English
- LU publication?
- yes
- id
- 757ffc2c-de31-4614-aa3e-040272f223b6
- date added to LUP
- 2024-06-09 08:09:05
- date last changed
- 2024-06-11 09:22:13
@article{757ffc2c-de31-4614-aa3e-040272f223b6,
abstract = {{Polymer solutions in the dilute regime play a significant role in industrial applications. Due to the intricate rheological properties of these highly viscoelastic fluids, especially in complex flow geometries, a thorough numerical analysis of their flow dynamics is imperative. In this research, we present a numerical investigation of purely elastic instability occurring in two- and three-dimensional serpentine channels under conditions where fluid inertia is negligible and across a broad spectrum of polymer relaxation times. Our findings reveal a strong qualitative agreement between the existing experimental results obtained from dilute solutions of flexible polymers in microfluidic devices and the numerical simulations conducted in two and three dimensions using the Oldroyd-B model. Spatial flow observations and statistical analysis of temporal flow features indicate that this purely elastic turbulent flow exhibits nonhomogeneous, non-Gaussian, and anisotropic characteristics across all scales. Additionally, our comparison of two- and three-dimensional simulations demonstrates that the elastic instability is primarily driven by the curvature of the streamlines induced by the flow geometry, rather than the weak secondary flow in the azimuthal direction. Therefore, our two-dimensional numerical simulations successfully replicate, at least qualitatively, the features observed in three-dimensional experiments. Furthermore, spectral analysis suggests that, in comparison to elastic turbulence in the dilute regime, the range of scales for the excited fluctuations is narrower.}},
author = {{Garg, Himani and Fureby, Christer}},
issn = {{2470-0045}},
keywords = {{Elastic Turbulence; microfluidic channel; Viscoelastic fluid; OpenFOAM; Numerical simulations}},
language = {{eng}},
month = {{05}},
publisher = {{American Physical Society}},
series = {{Physical Review E: covering statistical, nonlinear, biological, and soft matter physics}},
title = {{Comparison of viscoelastic flows in two- and three-dimensional serpentine channels}},
url = {{http://dx.doi.org/10.1103/PhysRevE.109.055108}},
doi = {{10.1103/PhysRevE.109.055108}},
volume = {{109}},
year = {{2024}},
}