Dense bidisperse suspensions under non-homogeneous shear
Abstract We study the rheological behaviour of bidisperse suspensions in three dimensions under a non-uniform shear flow, made by the superimposition of a linear shear and a sinusoidal disturbance. Our results show that (i) only a streamwise disturbance in the shear-plane alters the suspension dynam...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
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Nature Portfolio
2023-08-01
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| Series: | Scientific Reports |
| Online Access: | https://doi.org/10.1038/s41598-023-41587-3 |
| _version_ | 1797559748760961024 |
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| author | Alessandro Monti Marco Edoardo Rosti |
| author_facet | Alessandro Monti Marco Edoardo Rosti |
| author_sort | Alessandro Monti |
| collection | DOAJ |
| description | Abstract We study the rheological behaviour of bidisperse suspensions in three dimensions under a non-uniform shear flow, made by the superimposition of a linear shear and a sinusoidal disturbance. Our results show that (i) only a streamwise disturbance in the shear-plane alters the suspension dynamics by substantially reducing the relative viscosity, (ii) with the amplitude of the disturbance determining a threshold value for the effect to kick-in and its wavenumber controlling the amount of reduction and which of the two phases is affected. We show that, (iii) the rheological changes are caused by the effective separation of the two phases, with the large or small particles layering in separate regions. We provide a physical explanation of the phase separation process and of the conditions necessary to trigger it. We test the results in the whole flow curve, and we show that the mechanism remains substantially unaltered, with the only difference being the nature of the interactions between particles modified by the phase separation. |
| first_indexed | 2024-03-10T17:49:42Z |
| format | Article |
| id | doaj.art-42c47cd3a062402faac6972d00635cb8 |
| institution | Directory Open Access Journal |
| issn | 2045-2322 |
| language | English |
| last_indexed | 2024-03-10T17:49:42Z |
| publishDate | 2023-08-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Scientific Reports |
| spelling | doaj.art-42c47cd3a062402faac6972d00635cb82023-11-20T09:23:08ZengNature PortfolioScientific Reports2045-23222023-08-0113111210.1038/s41598-023-41587-3Dense bidisperse suspensions under non-homogeneous shearAlessandro Monti0Marco Edoardo Rosti1Complex Fluids and Flows Unit, Okinawa Institute of Science and Technology Graduate UniversityComplex Fluids and Flows Unit, Okinawa Institute of Science and Technology Graduate UniversityAbstract We study the rheological behaviour of bidisperse suspensions in three dimensions under a non-uniform shear flow, made by the superimposition of a linear shear and a sinusoidal disturbance. Our results show that (i) only a streamwise disturbance in the shear-plane alters the suspension dynamics by substantially reducing the relative viscosity, (ii) with the amplitude of the disturbance determining a threshold value for the effect to kick-in and its wavenumber controlling the amount of reduction and which of the two phases is affected. We show that, (iii) the rheological changes are caused by the effective separation of the two phases, with the large or small particles layering in separate regions. We provide a physical explanation of the phase separation process and of the conditions necessary to trigger it. We test the results in the whole flow curve, and we show that the mechanism remains substantially unaltered, with the only difference being the nature of the interactions between particles modified by the phase separation.https://doi.org/10.1038/s41598-023-41587-3 |
| spellingShingle | Alessandro Monti Marco Edoardo Rosti Dense bidisperse suspensions under non-homogeneous shear Scientific Reports |
| title | Dense bidisperse suspensions under non-homogeneous shear |
| title_full | Dense bidisperse suspensions under non-homogeneous shear |
| title_fullStr | Dense bidisperse suspensions under non-homogeneous shear |
| title_full_unstemmed | Dense bidisperse suspensions under non-homogeneous shear |
| title_short | Dense bidisperse suspensions under non-homogeneous shear |
| title_sort | dense bidisperse suspensions under non homogeneous shear |
| url | https://doi.org/10.1038/s41598-023-41587-3 |
| work_keys_str_mv | AT alessandromonti densebidispersesuspensionsundernonhomogeneousshear AT marcoedoardorosti densebidispersesuspensionsundernonhomogeneousshear |