Localized jammed clusters persist in shear-thickening suspension subjected to swirling excitation
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arXiv
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| Format: | Preprint |
| Published: |
2023
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| _version_ | 1866910559384895488 |
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| author | Shi, Li-Xin Zhao, Song-Chuan |
| author_facet | Shi, Li-Xin Zhao, Song-Chuan |
| contents | We investigate the dynamic evolution of heterogeneity in shear-thickening suspensions subjected to swirling excitation with a free surface. The uniform state of such a system may lose its stability when the oscillation frequency is above a threshold, and density waves spontaneously form (Shi \textit{et al.} JFM 2024). Here, we report a novel state where jammed clusters emerge in high-density region of the density waves. The jammed cluster exhibits unique motion, creating downstream high-density regions distinct from previously reported state of density waves. Additionally, theoretical calculations show that reducing suspension thickness lowers the frequency and global concentration $Φ$ threshold for the heterogeneity onset. Notably, the minimal $Φ$ for instability can be lower than the onset of discontinuous shear thickening transition. We also highlight the role of the free surface in cluster growth and persistence. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2311_14408 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Localized jammed clusters persist in shear-thickening suspension subjected to swirling excitation Shi, Li-Xin Zhao, Song-Chuan Soft Condensed Matter Fluid Dynamics We investigate the dynamic evolution of heterogeneity in shear-thickening suspensions subjected to swirling excitation with a free surface. The uniform state of such a system may lose its stability when the oscillation frequency is above a threshold, and density waves spontaneously form (Shi \textit{et al.} JFM 2024). Here, we report a novel state where jammed clusters emerge in high-density region of the density waves. The jammed cluster exhibits unique motion, creating downstream high-density regions distinct from previously reported state of density waves. Additionally, theoretical calculations show that reducing suspension thickness lowers the frequency and global concentration $Φ$ threshold for the heterogeneity onset. Notably, the minimal $Φ$ for instability can be lower than the onset of discontinuous shear thickening transition. We also highlight the role of the free surface in cluster growth and persistence. |
| title | Localized jammed clusters persist in shear-thickening suspension subjected to swirling excitation |
| topic | Soft Condensed Matter Fluid Dynamics |
| url | https://arxiv.org/abs/2311.14408 |