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| Main Authors: | , , , |
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| Format: | Preprint |
| Published: |
2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2510.21971 |
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| _version_ | 1866908611363471360 |
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| author | Mortenfeld, Chen van Reeuwijk, Maarten Littman, Aviv Liberzon, Alex |
| author_facet | Mortenfeld, Chen van Reeuwijk, Maarten Littman, Aviv Liberzon, Alex |
| contents | We experimentally investigate the dynamics of inertial spheres settling through density-stratified interfaces, focusing on the conditions that lead to pronounced deceleration and ``bouncing''. Using synchronized particle tracking and flow visualization in both water-salt and water-glycerol stratifications, we extend the parameter space of previous studies to include significant viscosity contrasts. We show that existing models based solely on density ratios fail to capture the observed retention times and bouncing behavior. Instead, we identify the ratio of particle Froude numbers across the interface, $Fr_2/Fr_1 \le 0.142$, as the critical condition distinguishing bouncing from non-bouncing cases. Using a drag-law of the form $C_d = αRe^{-β}$, this ratio can be expressed in terms of density and viscosity contrasts. The results reveal how inertia, viscosity, and stratification jointly control particle retention, with implications for sedimentation, separation, and biogeophysical transport processes. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2510_21971 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Revisiting the phenomenon of bouncing of inertial particles crossing density stratified interfaces Mortenfeld, Chen van Reeuwijk, Maarten Littman, Aviv Liberzon, Alex Fluid Dynamics We experimentally investigate the dynamics of inertial spheres settling through density-stratified interfaces, focusing on the conditions that lead to pronounced deceleration and ``bouncing''. Using synchronized particle tracking and flow visualization in both water-salt and water-glycerol stratifications, we extend the parameter space of previous studies to include significant viscosity contrasts. We show that existing models based solely on density ratios fail to capture the observed retention times and bouncing behavior. Instead, we identify the ratio of particle Froude numbers across the interface, $Fr_2/Fr_1 \le 0.142$, as the critical condition distinguishing bouncing from non-bouncing cases. Using a drag-law of the form $C_d = αRe^{-β}$, this ratio can be expressed in terms of density and viscosity contrasts. The results reveal how inertia, viscosity, and stratification jointly control particle retention, with implications for sedimentation, separation, and biogeophysical transport processes. |
| title | Revisiting the phenomenon of bouncing of inertial particles crossing density stratified interfaces |
| topic | Fluid Dynamics |
| url | https://arxiv.org/abs/2510.21971 |