Shear Layers and Plugs in the Capillary Flow of Wormlike Micellar Gels
Fuente:
arXiv
Gespeichert in:
| Hauptverfasser: | , , , |
|---|---|
| Format: | Preprint |
| Veröffentlicht: |
2024
|
| Schlagworte: | |
| Online-Zugang: | |
| Tags: |
Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
|
| _version_ | 1866916101794824192 |
|---|---|
| author | Gupta, Ronak Daneshi, Masoud Frigaard, Ian Elfring, Gwynn |
| author_facet | Gupta, Ronak Daneshi, Masoud Frigaard, Ian Elfring, Gwynn |
| contents | Wormlike micellar solutions formed by long-chained zwitterionic surfactants show gel-like rheology at room temperature and have recently been found to exhibit other complex and interesting rheological features. We study the dynamics of these wormlike micellar gels in a pipe-flow scenario using optical coherence tomography-based velocimetry and report the existence of plug flows with strong wall slip and non-parabolic velocity profiles for different surfactant concentrations and imposed flow rates. We rationalize these results as features of a developing transient flow of a viscoelastic solution in space and time and show that these shear layers indicate a flow induced heterogeneity. Our experiments shed light on the transient fluid dynamics of wormlike micelles in simple geometries and highlight the complexity of flows involving wormlike micellar gels and similar soft matter systems in canonical flows. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2401_12102 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Shear Layers and Plugs in the Capillary Flow of Wormlike Micellar Gels Gupta, Ronak Daneshi, Masoud Frigaard, Ian Elfring, Gwynn Soft Condensed Matter Fluid Dynamics Wormlike micellar solutions formed by long-chained zwitterionic surfactants show gel-like rheology at room temperature and have recently been found to exhibit other complex and interesting rheological features. We study the dynamics of these wormlike micellar gels in a pipe-flow scenario using optical coherence tomography-based velocimetry and report the existence of plug flows with strong wall slip and non-parabolic velocity profiles for different surfactant concentrations and imposed flow rates. We rationalize these results as features of a developing transient flow of a viscoelastic solution in space and time and show that these shear layers indicate a flow induced heterogeneity. Our experiments shed light on the transient fluid dynamics of wormlike micelles in simple geometries and highlight the complexity of flows involving wormlike micellar gels and similar soft matter systems in canonical flows. |
| title | Shear Layers and Plugs in the Capillary Flow of Wormlike Micellar Gels |
| topic | Soft Condensed Matter Fluid Dynamics |
| url | https://arxiv.org/abs/2401.12102 |