Flow-Induced Phase Separation for Active Brownian Particles in Four-Roll-Mill Flow
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arXiv
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| Auteurs principaux: | , , , |
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| Format: | Preprint |
| Publié: |
2025
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| _version_ | 1866910052234821632 |
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| author | Prajapati, Soni D. Seervi, Kusum Bhatnagar, Akshay Gupta, Anupam |
| author_facet | Prajapati, Soni D. Seervi, Kusum Bhatnagar, Akshay Gupta, Anupam |
| contents | We investigate the collective dynamics of active Brownian particles (ABPs) subjected to a steady two-dimensional four-roll-mill flow using numerical simulations. By varying the packing fraction ($ϕ$), we uncover a novel flow-induced phase separation (FIPS) that emerges beyond a critical density ($ϕ\geq 0.6$). The mean-square displacement (MSD) exhibits an intermediate bump between ballistic and diffusive regimes, indicating transient trapping and flow-guided clustering. The effective diffusivity decreases quadratically with $ϕ$, while the drift velocity remains nearly constant, demonstrating that large-scale transport is primarily dictated by the background flow. Number fluctuations show a crossover from normal to giant scaling, signaling the onset of long-range density inhomogeneities in the FIPS regime. Our findings provide new insights into the coupling between activity, crowding, and flow, offering a unified framework for understanding phase behavior in driven active matter systems. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2510_24960 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Flow-Induced Phase Separation for Active Brownian Particles in Four-Roll-Mill Flow Prajapati, Soni D. Seervi, Kusum Bhatnagar, Akshay Gupta, Anupam Soft Condensed Matter Fluid Dynamics We investigate the collective dynamics of active Brownian particles (ABPs) subjected to a steady two-dimensional four-roll-mill flow using numerical simulations. By varying the packing fraction ($ϕ$), we uncover a novel flow-induced phase separation (FIPS) that emerges beyond a critical density ($ϕ\geq 0.6$). The mean-square displacement (MSD) exhibits an intermediate bump between ballistic and diffusive regimes, indicating transient trapping and flow-guided clustering. The effective diffusivity decreases quadratically with $ϕ$, while the drift velocity remains nearly constant, demonstrating that large-scale transport is primarily dictated by the background flow. Number fluctuations show a crossover from normal to giant scaling, signaling the onset of long-range density inhomogeneities in the FIPS regime. Our findings provide new insights into the coupling between activity, crowding, and flow, offering a unified framework for understanding phase behavior in driven active matter systems. |
| title | Flow-Induced Phase Separation for Active Brownian Particles in Four-Roll-Mill Flow |
| topic | Soft Condensed Matter Fluid Dynamics |
| url | https://arxiv.org/abs/2510.24960 |