Spreading and engulfment of a viscoelastic film onto a Newtonian droplet
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arXiv
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| Format: | Preprint |
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2024
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| author | Zhao, Chunheng Lee, Taehun Carlson, Andreas |
| author_facet | Zhao, Chunheng Lee, Taehun Carlson, Andreas |
| contents | We use the conservative phase-field lattice Boltzmann method to investigate the dynamics when a Newtonian droplet comes in contact with an immiscible viscoelastic liquid film. The dynamics of the three liquid phases are explored through numerical simulations, with a focus on illustrating the contact line dynamics and the viscoelastic effects described by the Oldroyd-B model. The droplet dynamics are contrasted with the case of a Newtonian fluid film. The simulations demonstrate that when the film is viscoelastic, the droplet dynamics become insensitive to the film thickness when the polymer viscosity and relaxation time are large. A viscoelastic ridge forms at the moving contact line, which evolves with a power-law dependence on time. By rescaling the interface profile of the ridge using its height and width, it appears to collapse onto a similar shape. Our findings reveal a strong correlation between the viscoelastic stress and the interface shape near the contact line. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2401_17762 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Spreading and engulfment of a viscoelastic film onto a Newtonian droplet Zhao, Chunheng Lee, Taehun Carlson, Andreas Fluid Dynamics We use the conservative phase-field lattice Boltzmann method to investigate the dynamics when a Newtonian droplet comes in contact with an immiscible viscoelastic liquid film. The dynamics of the three liquid phases are explored through numerical simulations, with a focus on illustrating the contact line dynamics and the viscoelastic effects described by the Oldroyd-B model. The droplet dynamics are contrasted with the case of a Newtonian fluid film. The simulations demonstrate that when the film is viscoelastic, the droplet dynamics become insensitive to the film thickness when the polymer viscosity and relaxation time are large. A viscoelastic ridge forms at the moving contact line, which evolves with a power-law dependence on time. By rescaling the interface profile of the ridge using its height and width, it appears to collapse onto a similar shape. Our findings reveal a strong correlation between the viscoelastic stress and the interface shape near the contact line. |
| title | Spreading and engulfment of a viscoelastic film onto a Newtonian droplet |
| topic | Fluid Dynamics |
| url | https://arxiv.org/abs/2401.17762 |