How universal is the vibration-velocity controlled granular convection?
Recently, a number of articles have reported that granular convection induced by continuous vibration is controlled by vibration velocity, in contrast with some previous studies. We have reported such an example for the Brazil nut effect when the vibration is given discontinuously, using a one-layer...
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| Format: | Article |
| Language: | English |
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EDP Sciences
2021-01-01
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| Series: | EPJ Web of Conferences |
| Online Access: | https://www.epj-conferences.org/articles/epjconf/pdf/2021/03/epjconf_pg2021_03019.pdf |
| _version_ | 1819144036623056896 |
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| author | Umehara Mika Okumura Ko |
| author_facet | Umehara Mika Okumura Ko |
| author_sort | Umehara Mika |
| collection | DOAJ |
| description | Recently, a number of articles have reported that granular convection induced by continuous vibration is controlled by vibration velocity, in contrast with some previous studies. We have reported such an example for the Brazil nut effect when the vibration is given discontinuously, using a one-layer granular bed in a cell with down-facing side walls. Here, we report the effect of vibration phase and wall friction using the same experimental system, to confirm rising motion of an intruder induced by granular convection is again governed by vibration velocity. We compare two different cases of vibration phase for giving intermittent vibration cycles, and found one, in which granular packing is well established before grains start to lose contacts due to vibration, provides distinctly high reproducibility. We further control the side wall friction using a microfabrication technique, and found that significantly high reproducibility is attained in a cell with vertical side walls when a millimeter texture is introduced on the side walls. Our results indicate that the granular convection is universally controlled by vibration velocity. The present study opens a way to conduct highly reproducible experiments on granular dynamics, which is indispensable for deep physical understanding of granular flow and segregation. |
| first_indexed | 2024-12-22T12:35:45Z |
| format | Article |
| id | doaj.art-dd1d5badeaaa486182f113473bfd7f9b |
| institution | Directory Open Access Journal |
| issn | 2100-014X |
| language | English |
| last_indexed | 2024-12-22T12:35:45Z |
| publishDate | 2021-01-01 |
| publisher | EDP Sciences |
| record_format | Article |
| series | EPJ Web of Conferences |
| spelling | doaj.art-dd1d5badeaaa486182f113473bfd7f9b2022-12-21T18:25:35ZengEDP SciencesEPJ Web of Conferences2100-014X2021-01-012490301910.1051/epjconf/202124903019epjconf_pg2021_03019How universal is the vibration-velocity controlled granular convection?Umehara Mika0Okumura Ko1Department of Physics, Faculty of Science, Ochanomizu UniversityDepartment of Physics, Faculty of Science, Ochanomizu UniversityRecently, a number of articles have reported that granular convection induced by continuous vibration is controlled by vibration velocity, in contrast with some previous studies. We have reported such an example for the Brazil nut effect when the vibration is given discontinuously, using a one-layer granular bed in a cell with down-facing side walls. Here, we report the effect of vibration phase and wall friction using the same experimental system, to confirm rising motion of an intruder induced by granular convection is again governed by vibration velocity. We compare two different cases of vibration phase for giving intermittent vibration cycles, and found one, in which granular packing is well established before grains start to lose contacts due to vibration, provides distinctly high reproducibility. We further control the side wall friction using a microfabrication technique, and found that significantly high reproducibility is attained in a cell with vertical side walls when a millimeter texture is introduced on the side walls. Our results indicate that the granular convection is universally controlled by vibration velocity. The present study opens a way to conduct highly reproducible experiments on granular dynamics, which is indispensable for deep physical understanding of granular flow and segregation.https://www.epj-conferences.org/articles/epjconf/pdf/2021/03/epjconf_pg2021_03019.pdf |
| spellingShingle | Umehara Mika Okumura Ko How universal is the vibration-velocity controlled granular convection? EPJ Web of Conferences |
| title | How universal is the vibration-velocity controlled granular convection? |
| title_full | How universal is the vibration-velocity controlled granular convection? |
| title_fullStr | How universal is the vibration-velocity controlled granular convection? |
| title_full_unstemmed | How universal is the vibration-velocity controlled granular convection? |
| title_short | How universal is the vibration-velocity controlled granular convection? |
| title_sort | how universal is the vibration velocity controlled granular convection |
| url | https://www.epj-conferences.org/articles/epjconf/pdf/2021/03/epjconf_pg2021_03019.pdf |
| work_keys_str_mv | AT umeharamika howuniversalisthevibrationvelocitycontrolledgranularconvection AT okumurako howuniversalisthevibrationvelocitycontrolledgranularconvection |