Rheo-PIV of a shear-banding wormlike micellar solution under large amplitude oscillatory shear
We explore the behavior of a wormlike micellar solution under both steady and large amplitude oscillatory shear (LAOS) in a cone–plate geometry through simultaneous bulk rheometry and localized velocimetric measurements. First, particle image velocimetry is used to show that the shear-banded profile...
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| Format: | Article |
| Language: | en_US |
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Springer-Verlag
2013
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| Online Access: | http://hdl.handle.net/1721.1/79095 https://orcid.org/0000-0001-8323-2779 |
| _version_ | 1826207800667144192 |
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| author | Dimitriou, Christopher J. McKinley, Gareth H. Casanellas Vilageliu, Laura Ober, Thomas Joseph |
| author2 | Massachusetts Institute of Technology. Department of Mechanical Engineering |
| author_facet | Massachusetts Institute of Technology. Department of Mechanical Engineering Dimitriou, Christopher J. McKinley, Gareth H. Casanellas Vilageliu, Laura Ober, Thomas Joseph |
| author_sort | Dimitriou, Christopher J. |
| collection | MIT |
| description | We explore the behavior of a wormlike micellar solution under both steady and large amplitude oscillatory shear (LAOS) in a cone–plate geometry through simultaneous bulk rheometry and localized velocimetric measurements. First, particle image velocimetry is used to show that the shear-banded profiles observed in steady shear are in qualitative agreement with previous results for flow in the cone–plate geometry. Then under LAOS, we observe the onset of shear-banded flow in the fluid as it is progressively deformed into the non-linear regime—this onset closely coincides with the appearance of higher harmonics in the periodic stress signal measured by the rheometer. These harmonics are quantified using the higher-order elastic and viscous Chebyshev coefficients e [subscript n] and v [subscript n] , which are shown to grow as the banding behavior becomes more pronounced. The high resolution of the velocimetric imaging system enables spatiotemporal variations in the structure of the banded flow to be observed in great detail. Specifically, we observe that at large strain amplitudes (γ [subscript 0] ≥ 1), the fluid exhibits a three-banded velocity profile with a high shear rate band located in-between two lower shear rate bands adjacent to each wall. This band persists over the full cycle of the oscillation, resulting in no phase lag being observed between the appearance of the band and the driving strain amplitude. In addition to the kinematic measurements of shear banding, the methods used to prevent wall slip and edge irregularities are discussed in detail, and these methods are shown to have a measurable effect on the stability boundaries of the shear-banded flow. |
| first_indexed | 2024-09-23T13:55:10Z |
| format | Article |
| id | mit-1721.1/79095 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T13:55:10Z |
| publishDate | 2013 |
| publisher | Springer-Verlag |
| record_format | dspace |
| spelling | mit-1721.1/790952022-09-28T17:03:13Z Rheo-PIV of a shear-banding wormlike micellar solution under large amplitude oscillatory shear Dimitriou, Christopher J. McKinley, Gareth H. Casanellas Vilageliu, Laura Ober, Thomas Joseph Massachusetts Institute of Technology. Department of Mechanical Engineering Massachusetts Institute of Technology. School of Engineering Dimitriou, Christopher J. Ober, Thomas Joseph Casanellas Vilageliu, Laura McKinley, Gareth H. We explore the behavior of a wormlike micellar solution under both steady and large amplitude oscillatory shear (LAOS) in a cone–plate geometry through simultaneous bulk rheometry and localized velocimetric measurements. First, particle image velocimetry is used to show that the shear-banded profiles observed in steady shear are in qualitative agreement with previous results for flow in the cone–plate geometry. Then under LAOS, we observe the onset of shear-banded flow in the fluid as it is progressively deformed into the non-linear regime—this onset closely coincides with the appearance of higher harmonics in the periodic stress signal measured by the rheometer. These harmonics are quantified using the higher-order elastic and viscous Chebyshev coefficients e [subscript n] and v [subscript n] , which are shown to grow as the banding behavior becomes more pronounced. The high resolution of the velocimetric imaging system enables spatiotemporal variations in the structure of the banded flow to be observed in great detail. Specifically, we observe that at large strain amplitudes (γ [subscript 0] ≥ 1), the fluid exhibits a three-banded velocity profile with a high shear rate band located in-between two lower shear rate bands adjacent to each wall. This band persists over the full cycle of the oscillation, resulting in no phase lag being observed between the appearance of the band and the driving strain amplitude. In addition to the kinematic measurements of shear banding, the methods used to prevent wall slip and edge irregularities are discussed in detail, and these methods are shown to have a measurable effect on the stability boundaries of the shear-banded flow. Spain. Ministerio de Educación y Ciencia (MEC) (Project FIS2010-21924-C02-02) 2013-06-11T21:04:50Z 2013-06-11T21:04:50Z 2012-03 2011-09 Article http://purl.org/eprint/type/JournalArticle 0035-4511 1435-1528 http://hdl.handle.net/1721.1/79095 Dimitriou, Christopher J. et al. “Rheo-PIV of a Shear-banding Wormlike Micellar Solution Under Large Amplitude Oscillatory Shear.” Rheologica Acta 51.5 (2012): 395–411. https://orcid.org/0000-0001-8323-2779 en_US http://dx.doi.org/10.1007/s00397-012-0619-9 Rheologica Acta Creative Commons Attribution-Noncommercial-Share Alike 3.0 http://creativecommons.org/licenses/by-nc-sa/3.0/ application/pdf Springer-Verlag MIT web domain |
| spellingShingle | Dimitriou, Christopher J. McKinley, Gareth H. Casanellas Vilageliu, Laura Ober, Thomas Joseph Rheo-PIV of a shear-banding wormlike micellar solution under large amplitude oscillatory shear |
| title | Rheo-PIV of a shear-banding wormlike micellar solution under large amplitude oscillatory shear |
| title_full | Rheo-PIV of a shear-banding wormlike micellar solution under large amplitude oscillatory shear |
| title_fullStr | Rheo-PIV of a shear-banding wormlike micellar solution under large amplitude oscillatory shear |
| title_full_unstemmed | Rheo-PIV of a shear-banding wormlike micellar solution under large amplitude oscillatory shear |
| title_short | Rheo-PIV of a shear-banding wormlike micellar solution under large amplitude oscillatory shear |
| title_sort | rheo piv of a shear banding wormlike micellar solution under large amplitude oscillatory shear |
| url | http://hdl.handle.net/1721.1/79095 https://orcid.org/0000-0001-8323-2779 |
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