Capillary and priming pressures control the penetration of yield-stress fluids through non-wetting 2D meshes
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arXiv
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| Autori principali: | , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| _version_ | 1866911247550644224 |
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| author | Bourgade, Manon Bain, Nicolas Vanel, Loïc Leocmach, Mathieu Barentin, Catherine |
| author_facet | Bourgade, Manon Bain, Nicolas Vanel, Loïc Leocmach, Mathieu Barentin, Catherine |
| contents | Forcing hydrophilic fluids through hydrophobic porous solids is a recurrent industrial challenge. If the penetrating fluid is Newtonian, the imposed pressure has to overcome the capillary pressure at the fluid-air interface in a pore. The presence of a yield-stress, however, makes the pressure transfer and the penetration significantly more complex. In this study, we experimentally investigate the forced penetration of a water based yield-stress fluid through a regular hydrophobic mesh under quasi-static conditions, combining quantitative pressure measurements and direct visualisation of the penetration process. We reveal that the penetration is controlled by a competition between the yield-stress and two distinct pressures. The capillary pressure, that dictates the threshold at which the yield-stress fluid penetrates the hydrophobic mesh, and a priming pressure, that controls how the fluid advances through it. The latter corresponds to a pressure drop ensuing a local capillary instability, never reported before. Our findings shine a new light on forced imbibition processes, with direct implications on their fundamental understanding and practical engineering. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2511_01771 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Capillary and priming pressures control the penetration of yield-stress fluids through non-wetting 2D meshes Bourgade, Manon Bain, Nicolas Vanel, Loïc Leocmach, Mathieu Barentin, Catherine Soft Condensed Matter Fluid Dynamics Forcing hydrophilic fluids through hydrophobic porous solids is a recurrent industrial challenge. If the penetrating fluid is Newtonian, the imposed pressure has to overcome the capillary pressure at the fluid-air interface in a pore. The presence of a yield-stress, however, makes the pressure transfer and the penetration significantly more complex. In this study, we experimentally investigate the forced penetration of a water based yield-stress fluid through a regular hydrophobic mesh under quasi-static conditions, combining quantitative pressure measurements and direct visualisation of the penetration process. We reveal that the penetration is controlled by a competition between the yield-stress and two distinct pressures. The capillary pressure, that dictates the threshold at which the yield-stress fluid penetrates the hydrophobic mesh, and a priming pressure, that controls how the fluid advances through it. The latter corresponds to a pressure drop ensuing a local capillary instability, never reported before. Our findings shine a new light on forced imbibition processes, with direct implications on their fundamental understanding and practical engineering. |
| title | Capillary and priming pressures control the penetration of yield-stress fluids through non-wetting 2D meshes |
| topic | Soft Condensed Matter Fluid Dynamics |
| url | https://arxiv.org/abs/2511.01771 |