Anomalous Transport of Elongated Particles in Oscillatory Vortical Flows
Fuente:
arXiv
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| Autores principales: | , , , , |
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| Formato: | Preprint |
| Publicado: |
2025
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| Acceso en línea: | |
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| _version_ | 1866913988361584640 |
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| author | Hu, Shiyuan Yang, Xiuyuan Luo, Nan Zhang, Jun Man, Xingkun |
| author_facet | Hu, Shiyuan Yang, Xiuyuan Luo, Nan Zhang, Jun Man, Xingkun |
| contents | We investigate the transport dynamics of elongated particles in cellular vortical flows that undergo spatial oscillations over time. Experimental flow visualizations reveal mixed flow fields with chaotic and elliptic regions coexisting. Surprisingly, the particle transport rate does not increase monotonically with particle length, even though longer particles are expected to explore neighboring vortices more easily. Numerical simulations in a much larger system produce similar transport anomalies, characterized by subdiffusion due to frequent long-time trapping in vortices at certain lengths, but normal diffusion at others. At moderate oscillation frequencies, these long-time trapping events occur within the chaotic region; at high frequencies, they occur in the elliptic regions, but only for particles whose lengths match these regions. In the latter case, subdiffusion is robust against random noise. Our results reveal new mechanisms for controlling particle diffusion in fluid flows. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2508_09677 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Anomalous Transport of Elongated Particles in Oscillatory Vortical Flows Hu, Shiyuan Yang, Xiuyuan Luo, Nan Zhang, Jun Man, Xingkun Fluid Dynamics We investigate the transport dynamics of elongated particles in cellular vortical flows that undergo spatial oscillations over time. Experimental flow visualizations reveal mixed flow fields with chaotic and elliptic regions coexisting. Surprisingly, the particle transport rate does not increase monotonically with particle length, even though longer particles are expected to explore neighboring vortices more easily. Numerical simulations in a much larger system produce similar transport anomalies, characterized by subdiffusion due to frequent long-time trapping in vortices at certain lengths, but normal diffusion at others. At moderate oscillation frequencies, these long-time trapping events occur within the chaotic region; at high frequencies, they occur in the elliptic regions, but only for particles whose lengths match these regions. In the latter case, subdiffusion is robust against random noise. Our results reveal new mechanisms for controlling particle diffusion in fluid flows. |
| title | Anomalous Transport of Elongated Particles in Oscillatory Vortical Flows |
| topic | Fluid Dynamics |
| url | https://arxiv.org/abs/2508.09677 |