Laser-driven droplet deformation at low Weber numbers
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arXiv
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| Main Authors: | , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| _version_ | 1866908619586404352 |
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| author | Kharbedia, M. França, H. L. Schubert, H. K. Engels, D. J. Jalaal, M. Versolato, O. O. |
| author_facet | Kharbedia, M. França, H. L. Schubert, H. K. Engels, D. J. Jalaal, M. Versolato, O. O. |
| contents | We investigate droplet deformation following laser-pulse impact at low Weber numbers (We ~ 0.1-100). Droplet dynamics can be characterized by two key parameters: the impact We number and the width, W, of the distribution of the impact force over the droplet surface. By varying laser pulse energy, our experiments traverse a phase space comprising (I) droplet oscillation, (II) breakup, or (III) sheet formation. Numerical simulations complement the experiments by determining the pressure width and by allowing We and W to be varied independently, despite their correlation in the experiments. A single phase diagram, integrating observations from both experiments and simulations, demonstrates that all phenomena can be explained by a single parameter: the deformation Weber number Wed=f(We, W) that is based on the initial radial expansion speed of the droplet, following impact. The resulting phase diagram separates (I) droplet oscillation for Wed<5, from (II) breakup for 5<Wed<60, and (III) sheet formation for Wed>60. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_01495 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Laser-driven droplet deformation at low Weber numbers Kharbedia, M. França, H. L. Schubert, H. K. Engels, D. J. Jalaal, M. Versolato, O. O. Fluid Dynamics We investigate droplet deformation following laser-pulse impact at low Weber numbers (We ~ 0.1-100). Droplet dynamics can be characterized by two key parameters: the impact We number and the width, W, of the distribution of the impact force over the droplet surface. By varying laser pulse energy, our experiments traverse a phase space comprising (I) droplet oscillation, (II) breakup, or (III) sheet formation. Numerical simulations complement the experiments by determining the pressure width and by allowing We and W to be varied independently, despite their correlation in the experiments. A single phase diagram, integrating observations from both experiments and simulations, demonstrates that all phenomena can be explained by a single parameter: the deformation Weber number Wed=f(We, W) that is based on the initial radial expansion speed of the droplet, following impact. The resulting phase diagram separates (I) droplet oscillation for Wed<5, from (II) breakup for 5<Wed<60, and (III) sheet formation for Wed>60. |
| title | Laser-driven droplet deformation at low Weber numbers |
| topic | Fluid Dynamics |
| url | https://arxiv.org/abs/2509.01495 |