Inertia-Dilatancy Interplay Governs Shear-Thickening Drop Impact
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arXiv
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| Auteurs principaux: | , , , , , , , |
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| Format: | Preprint |
| Publié: |
2026
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| _version_ | 1866908774281773056 |
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| author | Mobaseri, Anahita Gordillo, Leonardo Burton, Charles Yoon, Soyoon Lee, Dong Kumar, Satish Driscoll, Michelle M. Cheng, Xiang |
| author_facet | Mobaseri, Anahita Gordillo, Leonardo Burton, Charles Yoon, Soyoon Lee, Dong Kumar, Satish Driscoll, Michelle M. Cheng, Xiang |
| contents | Combining high-speed photography with direct force measurements, we investigate the impact dynamics of drops of cornstarch-water mixtures -- a premier example of shear-thickening fluids -- across a wide range of impact conditions. Our study identifies three distinct impact regimes. In addition to the liquid-like and solid-like behaviors generally expected for the impact-induced response of shear-thickening fluids, we uncover a counterintuitive regime in which high-concentration cornstarch-water mixtures display a liquid-like response at the onset of impact when shear rates are high and only transition to a solid-like behavior at later times as shear rates reduce. By integrating the classic drop-impact theory with the Reynolds-Darcy mechanism for dilatancy, we develop a unified model that quantitatively describes the impact dynamics of shear-thickening drops across all regimes. Our work reveals the unexpected response of shear-thickening fluids to ultra-fast deformation and advances fundamental understanding of drop impact for complex fluids. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2601_12642 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Inertia-Dilatancy Interplay Governs Shear-Thickening Drop Impact Mobaseri, Anahita Gordillo, Leonardo Burton, Charles Yoon, Soyoon Lee, Dong Kumar, Satish Driscoll, Michelle M. Cheng, Xiang Fluid Dynamics Soft Condensed Matter Combining high-speed photography with direct force measurements, we investigate the impact dynamics of drops of cornstarch-water mixtures -- a premier example of shear-thickening fluids -- across a wide range of impact conditions. Our study identifies three distinct impact regimes. In addition to the liquid-like and solid-like behaviors generally expected for the impact-induced response of shear-thickening fluids, we uncover a counterintuitive regime in which high-concentration cornstarch-water mixtures display a liquid-like response at the onset of impact when shear rates are high and only transition to a solid-like behavior at later times as shear rates reduce. By integrating the classic drop-impact theory with the Reynolds-Darcy mechanism for dilatancy, we develop a unified model that quantitatively describes the impact dynamics of shear-thickening drops across all regimes. Our work reveals the unexpected response of shear-thickening fluids to ultra-fast deformation and advances fundamental understanding of drop impact for complex fluids. |
| title | Inertia-Dilatancy Interplay Governs Shear-Thickening Drop Impact |
| topic | Fluid Dynamics Soft Condensed Matter |
| url | https://arxiv.org/abs/2601.12642 |