Ridge instability in dense suspensions caused by the second normal stress difference
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arXiv
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| Autores principales: | , , , , |
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| Formato: | Preprint |
| Publicado: |
2023
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| Materias: | |
| Acceso en línea: | |
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| _version_ | 1866911757984858112 |
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| author | Xiong, Zhongqiang Angerman, Peter Ellero, Marco Sandnes, Bjornar Seto, Ryohei |
| author_facet | Xiong, Zhongqiang Angerman, Peter Ellero, Marco Sandnes, Bjornar Seto, Ryohei |
| contents | A dense suspension of the cornstarch flowing on a very inclined wall finally forms some ridge-like patterns of the free surface. The onset of pattern formation is the primary target to elucidate the mechanism. In this work, based on the continuity of fluids and the force balance, we show that the flat free surface is unstable when the second normal stress difference $N_2$ is negatively proportional to shear stress and the gravity component perpendicular to the wall is weak enough. Such instability is inevitable to grow into a ridge-like surface profile oriented parallel to the flow direction. We use the instability criterion to predict the critical slope angle for the formation of ridge patterns. The estimated critical angle was found to be in agreement with experimental observations for a cornstarch suspension. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2311_11201 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Ridge instability in dense suspensions caused by the second normal stress difference Xiong, Zhongqiang Angerman, Peter Ellero, Marco Sandnes, Bjornar Seto, Ryohei Soft Condensed Matter A dense suspension of the cornstarch flowing on a very inclined wall finally forms some ridge-like patterns of the free surface. The onset of pattern formation is the primary target to elucidate the mechanism. In this work, based on the continuity of fluids and the force balance, we show that the flat free surface is unstable when the second normal stress difference $N_2$ is negatively proportional to shear stress and the gravity component perpendicular to the wall is weak enough. Such instability is inevitable to grow into a ridge-like surface profile oriented parallel to the flow direction. We use the instability criterion to predict the critical slope angle for the formation of ridge patterns. The estimated critical angle was found to be in agreement with experimental observations for a cornstarch suspension. |
| title | Ridge instability in dense suspensions caused by the second normal stress difference |
| topic | Soft Condensed Matter |
| url | https://arxiv.org/abs/2311.11201 |