Polarity switch of PMMA powder transported through a PMMA duct
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arXiv
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| Autores principales: | , |
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| Formato: | Preprint |
| Publicado: |
2024
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| _version_ | 1866916095374393344 |
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| author | Xu, Wenchao Grosshans, Holger |
| author_facet | Xu, Wenchao Grosshans, Holger |
| contents | During pneumatic conveying, powder electrifies rapidly due to the high flow velocities. In our experiments, the particles even charge if the conveying duct is made of the same material, which might be caused by triboelectrification between two asymmetric contact surfaces. Surprisingly, we found the airflow rate to determine the polarity of the overall powder charge. This study investigates the charging of microscale PMMA particles in turbulent flows passing through a square PMMA duct. The particles are spherical and monodisperse. A Faraday at the duct outlet measured the total charge of the particles. At low flow velocities, the particles charged negatively after passing through the duct. However, the powder's overall charge switched to a positive polarity when increasing the flow velocity. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2401_09505 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Polarity switch of PMMA powder transported through a PMMA duct Xu, Wenchao Grosshans, Holger Soft Condensed Matter During pneumatic conveying, powder electrifies rapidly due to the high flow velocities. In our experiments, the particles even charge if the conveying duct is made of the same material, which might be caused by triboelectrification between two asymmetric contact surfaces. Surprisingly, we found the airflow rate to determine the polarity of the overall powder charge. This study investigates the charging of microscale PMMA particles in turbulent flows passing through a square PMMA duct. The particles are spherical and monodisperse. A Faraday at the duct outlet measured the total charge of the particles. At low flow velocities, the particles charged negatively after passing through the duct. However, the powder's overall charge switched to a positive polarity when increasing the flow velocity. |
| title | Polarity switch of PMMA powder transported through a PMMA duct |
| topic | Soft Condensed Matter |
| url | https://arxiv.org/abs/2401.09505 |